Enhancing Ecologically Sustainable Management of Deadwood in Kenya’s Natural Forests

The need for ecologically sustainable management of natural forests has assumed greater prominence in conservation and climate change discourses. However, the identiﬁcation of deadwood, a critical component of natural forests, continues to receive little attention around the world. Through a review of the existing literature, this study sought to promote consciousness and awareness on the value of deadwood using the case of Kenya’s natural forests in the wider context of biodiversity conservation and climate change. Results substantiate that deadwood in natural forests performs a vital function in forest biological and ecological functions. However, forest degradation through the removal of deadwood, even though widely neglected, results in considerable biodiversity loss and might alter natural forest ecosystems, thereby exacerbating the impacts of climate change. In Kenya, despite the recent sophistication of forest management tools, including the development of the Draft Forest Policy, 2020, and enactment of the Forest Conservation and Management Act, 2016, to increasingly recognize the more progressive forest management paradigms such as participatory forest management in natural forest management, the current deadwood management practice is faulty and could yield outcomes contrary to the policy intentions and the wider provisions of ecologically sustainable forest management. It is because major policy documents lack robust and explicit guidelines on achieving ecologically sustainable management of deadwood despite its centrality in providing ecosystem services and as a highly dependable source of energy resources for over 70% of the Kenyan population. Moreover, deadwood management appears to be aﬀected by many complex biological, technical, policy, and socioeconomic factors that appear to be acting together against sustainable deadwood management. Still, perhaps most importantly, the absence of research on the topic is the most outstanding challenge. Therefore, in the future, improving the sustainable management of natural forests will require the restoration of deadwood and increasing consciousness on the value of deadwood through more research studies.


Introduction
Globally, natural forests provide many ecosystem services needed for biodiversity conservation and sustainable management [1,2]. Millions of people depend on forests for livelihood. Hence, there is the need to direct policies toward improving forest management in order to promote ecologically sustainable management where ecological processes are maintained, biodiversity is preserved, and a full range of benefits accrue to the society within the natural limits of a given natural forest [3,4].
However, in the wake of climate change concerns acting together with the growing human population accompanied by the seemingly unsustainable production and consumption patterns, especially related to wood energy resources and other existential threats, deforestation threatens the capacity of natural forests to generate benefits to the society in line with the ecologically sustainable forest management paradigm. Studies document that the destruction and deforestation of natural forest ecosystems start when huntergatherer communities shift to agricultural systems [5]. While discourses on deforestation have gained recognition in this era of climate change, the plunder and degradation of natural forests, due to legally sanctioned removal of deadwood, goes unnoticed by the society and generally remains an understudied subject area around the globe [4,[6][7][8][9][10][11][12][13].
Deadwood is a general term defining dead or dying trees fallen on the ground in forests [14]. Deadwood may also include carbon pools found in forests [9] or stumps, heartwood, branches, twigs, or barks on the ground and in the canopy of living trees or stag-headed trees [15,16]. ese dead or dying trees create high-diversity deadwood and are associated with numerous microhabitats for diverse life forms [4,5,9,10]. It is with backdrop that many countries around the world have formulated robust policies to raise public consciousness on the need to sustainably conserve and manage deadwood resources.
On the contrary, in Kenya, information on deadwood as a critical component of natural forests remains scanty. However, with the growing human population accompanied by the rising demand for forest products, especially wood energy resources, this scarcity of information on deadwood represents a major dilemma for the sustainable management of natural forests in the country for two reasons. Firstly, public awareness on the importance of deadwood is low. Secondly, in the wake of climate change and other existential threats, there is limited awareness on the strategies and policies that could be employed in order to promote successful natural forest regeneration and sustainable management of deadwood resources. Consequently, this paper seeks to address the above challenges by reviewing the current status of deadwood management in Kenya's gazetted natural forests in order to raise awareness on the importance of deadwood and suggest how ecologically sustainable forest management could be achieved by incorporating deadwood management policies and strategies such as bioeconomy. Unlike previous studies which have examined the topic of deadwood from the strict perspective of sustainable forest management, for the first time, this paper will first explore the global literature on the concept of ecologically sustainable forest management in the context of the bioeconomy of deadwood and then apply the findings to Kenya's context in order to draw the policy implications of this paper.
Kenya has been chosen to represent the African continent in this study because the country is regarded as a low forest cover country compared to the recommended constitutional requirement of 10% and the minimum forest cover per country recommended by the United Nations [17]. e country has 7.4% of forest cover with diverse ecosystems [17]. ese forests are highly regarded as important natural capital providing many ecosystem services in the quest for sustainable development. Forestry provides up to 3.6% of Kenya's gross domestic product (GDP) [17,18]. In addition, the sector's indirect and induced effects in other associated sectors range between 33 and 39% of the country's GDP [17,18]. Forests also provide a variety of goods, which directly support the subsistence livelihoods of many communities. For instance, biomass constitutes approximately 80% of all energy utilized in Kenya [18]. is energy demand is bound to rise exponentially with the growing population and urbanization. is represents a threat to many natural forests in the country. Studies show that Kenya has lost approximately 50,000 ha of the forest which translates to over US $19 million [18]. In response, the government initiated several policy reforms aimed at promoting sustainable forest management. However, there is a need to amplify strategies and policies for deadwood conservation.

The Context for Deadwood in Kenya's Gazetted Natural Forests
Kenya is a multiparty democracy geographically located in East Africa. Administratively, following the enactment of the 2010 Constitution, the country has a devolved system comprising 47 county governments and one national government. Since attaining independence in 1963, the country has made several social economic strides. e population of the country stands at 47 million people and is projected to grow at the rate of 2.3% annually [18]. e urbanization rate is 30% with over 70% of the population relying on biomass energy resources. Forests are increasingly being recognized as important for in the wider socioeconomic transformation of the country as demonstrated by their reference in key development documents such as Vision 2030 and the Constitution of Kenya 2010 which establishes a 10% tree cover threshold for the country.
In order to contextualize deadwood resources in Kenya's forest management, in this paper, the term "forest" will be defined first and then be extended to describe the forest under study. A forest in Kenya is defined as land which has been declared or registered as a forest or woody vegetation growing in close proximity in an area of over 0.5 hectares.
is definition encompasses a forest in the process of establishment, woodlands, and thickets, whereas a natural forest or an indigenous forest which is the subject of this paper refers to a forest which has come into place as a result of natural regeneration with trees primarily native to Kenya [18,19]. Forest land represents an important land use option in Kenya as shown in Table 1. However, from Table 1, it can be seen that forest land reduced significantly up to the year 2000, but after the policy and legislative reforms that occurred around 2005 where the Forest Act, 2005, was enacted, the forest land rose to 4413 ha in 2015. e decline in forest cover had been attributed to complex development realities of those times marked by weak enforcement of policies, institutional weaknesses by forest actors, and lack of public participation in forest management [18]. e gazetted natural forest types under discussion in this paper are shown in Table 2 which include the western rainforests, montane forests, coastal forests, and dry forests of Kenya (Table 2) which are under the management of the national government through Kenya Forest Service (KFS), a state corporation in the Ministry of Environment and Forestry.
ese forests are not evenly distributed in the country as shown in Figure 1. e northeastern part of the country has less coverage compared to the western, central, and coastal regions of the country. Mangrove forests are confined in the coastal region along the Indian Ocean. Natural forests in central parts of the country are located around Mt. Kenya and the Aberdares (Figure 1).
Nevertheless, overall, the country has an estimated forest cover of 7.2% based on the national projection from the 2010 forest cover data [17,18]. Kenya has about 1.64 million ha of gazetted forest areas and about 100,000 ha of trust lands [22]. Public or gazetted natural forests cover an area of 905,357 ha [23]. e country's closed-canopy forests are concentrated in the moist mountainous areas where, coincidentally, human population and agricultural production activities are concentrated [24]. In the semiarid region, there are closedcanopy forests on isolated hills and along the riverine. Generally, Kenya's natural forest vegetation in public gazetted forests which comprises the forests under study in this paper consists of closed-canopy indigenous forests, woodlands, bushlands, and wooded grasslands as shown in Table 2 [25]. ese forests are rich in species diversity. Some estimates indicate that Kenya's forests harbor ca. 6000 species of higher plants and 875 and 1097 different butterflies and birds, respectively [24]. e vegetation types highlighted in Table 2 are defined by climatic, edaphic, and biotic factors and incidences of fire occurrence. Fortunately, despite the proportionately small area covered by closed-canopy forests ( Table 2) in relation to the overall country's surface area, forests continue to play a significant role by providing a wide variety of goods and services needed for human development [18,[25][26][27]. Unfortunately, most of these forests' ecosystem functions are not reflected as contributing to the country's gross domestic product (GDP) [28,29]. Forests contribute goods and services worth ca. 7 billion Kenya shillings to the economy. In addition, the sector directly employs 50,000 people and another 300,000 indirectly [24,28,30,31]. Moreover, forests are valued for religious and cultural practices, and some are important habitats for plant and animal species [24]. ere appears to be emerging forest management as the country transforms towards a middleincome country, but from the preceding discussion, it is evident that forest resources in the country are important in promoting human advancement and socioeconomic development. erefore, it is essential to put in place measures to ensure these forests are sustainably managed for present and future generations.
However, to provide useful lessons on improving the recognition of deadwood in the natural forests highlighted in Table 2 and Figure 1, it will be essential first to understand how forest management has evolved in the country. Historically, forest management, including the management of natural forests in Kenya, dates back to 1895 when the country was declared a British Protectorate [32]. Forest management has passed through a series of stages (precolonial, colonial, and decolonization) and now in a devolved system under participatory forest management where livelihoods are integrated with forest management [32]. Notably, each stage of forest management was dependent on the social, economic, and political realities of the time. However, the forest demarcation objectives in the colonial period were largely geared toward generating revenue for the then forest department (government) through timber and minor forest products. In the postcolonial era, the objectives of forest management were catchment protection, industrial forestry development, and protection from encroachment by local   Land use  1990  2000  2005  2010  2015  Forest land  4724  3557  4047  4230  4413  Crop land  9258  9661  9868  10,072  10,276  Grassland  41,522  41,654  41,496  41,080  40,664  Settlement  57  87  109  126  143  Other lands  1004  1574  1035  1044  1053  Wetland  1472  1504  1482  1485  1488  Total area  58,037  58,037  58,037  58,037  58,037 Source: National Strategy for 10% forest cover in Kenya [20].  [24]. In the postcolonial era, the realization of forest management objectives demanded that forest managers religiously apply sustainable forest management tools, which include Technical Orders of 1996 prepared by the then Forest Department (FD). In the context of natural forest restoration and regeneration, the "orders" highlight that "in order to get our natural forests restocked, natural regeneration will be used fully whenever it occurs (p. 3.1.00)." e "orders" further highlight that where a valuable species regenerates naturally, the area is marked off and a compartment register is opened for the species. As part of the tending and maintenance of regeneration, the technical orders demand that climbers and parasites be removed.
Other competitions should also be removed based on the management objective apart from removing the overhead cover that may suppress the growth of the "valuable species." On the one hand, the authors observe that this preferential treatment of some natural forest components was sound and largely geared toward promoting valuable timber species for commercial purposes. On the other hand, this discriminatory management practice could disregard other forest components such as less commercially viable tree species and deadwood in the forest ecosystem, which harms their ecologically sustainable management. With this hindsight, the authors intend to share lessons on the management of natural forests in the case of deadwood. Nevertheless, the current forest policy and legislative initiatives and discourses appear to be supporting the ecologically sustainable management of natural forests with greater emphasis on social equity through participatory forest management by advancing benefit sharing with the adjacent forest communities [24]. However, in general, studies show that these initiatives are primarily driven by utilitarian and preservationist paradigms. e preservationist approach entails excluding protected areas from extractive activities [31,33]. According to Wambugu et al. [24], this preservationist approach to forest management falls under the passive "unmanaged forest nature reserve" category mainly relevant to the national parks' forests. Most natural forests are managed under conservation systems that cut across passive and active management approaches, where high natural forests fall under passive management. Woodlands are between low and moderate management categories, while forest plantations are implemented under intensive short-rotation forestry management.
Unfortunately, the approach to resource protection either through preservation or protection appears to have constrained local communities' access, utilization, and control of the fundamental resource that supports their livelihoods [24]. However, with the emerging management approaches supported by new legislation, forest management can be guided by the paradigm behind true conservation in allowing sustainable direct (extractive and nonextractive) and indirect activities within designated ecosystems [31,33]. Based on this paradigm, an attempt to implement it in the area under forest reserves needs to be made where natural forests could be managed under the medium "combined objective forestry." In contrast, the plantation areas could be managed under the high "intensive even-aged forestry" tending to the intensive "short-rotation forestry" forest management approach. e new forest management paradigm calls for improved forest governance, devolution, sustainable forest management, partnerships, and collaboration with the state and nonstate actors, including the adjacent communities [34]. e authors observe that these paradigm changes can improve deadwood recognition and enhance the ecologically sustainable management of natural forests where local communities derive net social benefits. Besides, these development strides represent an efficient response to emerging issues that could enable the sector to contribute to the country's economic growth and poverty alleviation goals in line with the global forest principles. ese approaches in forest management have legacies that date back to the precolonial and colonial era.
Historically, the first formal forest policy was prepared in 1957 and revised in 1968 as Sessional Paper No. 1 of 1968. is policy focused on the management and conservation of forests on public land. Implementation of the 1968 policy was supported by the Forest Act Cap 385 of 1969. However, due to growing concerns about sustainability and specifically the conservation and sustainable management of biodiversity, a revised policy and legislation was prepared, which led to the enactment of Forest Act No. 7 of 2005. Later, following the enactment of the 2010 Constitution, which introduced devolved governance, entrenched further sustainable development paradigms in the country. Also, the need to align forest laws with the 2010 Constitution led to the development of Draft Forest Policy 2020 and the repealing of the Forest Act, 2005, by the Forest Conservation and Management Act, 2016, with prospects of enhancing sustainability. Robust forest management principles have been laid out, including applying an ecosystem approach in the management of natural forests driven by utilitarian and preservationist paradigms. Besides, the increased calls for decentralization in forest management decision-making led to the introduction of more progressive paradigms such as participatory forest management as a way of entrenching and reconciling both social equity and efficiency in natural forest management toward sustainable forest management.

Ecologically Sustainable Forest Management
Historically, the need for environmental sustainability arose from the growing global levels of tropical deforestation in the 1990s and the need to integrate forestry management with the objectives of biodiversity conservation [35][36][37]. In the quest for this sustainability, concepts such as sustainable forest management (SFM) emerged, which shifted the focus on forest management from mere wood production to the production of other forest resources as well [24]. In contrast with traditional wood-based forest management approaches, SFM offered greater flexibility to incorporate social, economic, and environmental goals in forest management [38,39]. Similar efforts within the framework of environmental conservation based on the Convention on Biological Diversity (CBD) led to the development of the ecosystem International Journal of Forestry Research approach concept as a framework for holistic conservation of all types of forest ecosystems [40][41][42][43].
Surprisingly, to date, deforestation continues despite the existence of these novel conceptualizations [44]. Also, implementation of the widely endorsed SFM and related concepts remains challenging partly because measuring sustainability is a daunting task. Studies show that the definition of SFM and other derivatives of sustainable development is open to many interpretations and questioning [45,46]. us, it is challenging to create sustainability indicators. Consequently, ongoing discourses in the scientific community are fast converging on other concepts such as ecologically sustainable forest management (ESFM). ESFM refers to the regeneration and restoration of natural forests by targeting all ecosystem and forest components. e concept has its origins in Australia, where forest management entails a holistic approach that targets both market and nonmarket values of forests for present and coming generations [47,48]. e primary goals of ESFM are to preserve the vigor of forested woodlands and ecosystems in a manner that maintains ecological integrity and processes that ensure there is a sustainable balance in ecological interactions. However, studies appear to indicate that forest vitality is challenging to quantify, but it is usually assessed by forest growth and physiological measurements. Forest biological diversity encompasses trees, other woody and nonwoody plants, animals, biotechnologically produced resources, and microorganisms that inhabit forest areas. ere are several levels for considering biological diversity, including the ecosystem, landscapes, species, populations, and genetics. However, perhaps most important, for this paper, is the emphasis that complex interactions can occur within and amongst these levels resulting in different processes and disturbances. e evolutionary disturbances that cause biodiversity changes include climate change, fire, and forestlevel competition. e diversity of forest ecosystems (in both biotic and abiotic features) results in high adaptation levels needed for biological diversity. erefore, within specific natural forests, the preservation of biological processes relies on maintaining their ecological variability [49]. is forest variability generates ecosystem services that provide social benefits, including contribution to the general socioeconomic development. For example, net social benefits are generated through employment and value addition to forest products [49].
In a rapidly urbanizing world, it is quite challenging to meet ecologically sustainable forest management requirements while completely meeting the society's socioeconomic development requirements because of the growing unsustainable energy demands. At times, forest value addition processes and activities involve the use of huge amounts of biomass energy resources derived from the already threatened biological resources, thus affecting the achievement of ecologically sustainable forest management.

Deadwood and Ecologically Sustainable Management of Natural Forests
Deadwood is important in the bioeconomy and ecologically sustainable management of natural forests. On the forest floor, it is created in a number of complex ways that may be a combination of both natural and anthropogenically induced causes. Existing literature shows that, in natural forests, droughts, storms, insect disease, microorganisms or other biotic stresses, and fire have been linked to damaging trees and creating deadwood with greater gatherings near canopy openings and in old-growth stands [50]. Gaps created by fallen or dead trees resulting from the highlighted natural disturbances can leave behind deadwood edifices, promoting heterogeneous flora recovery [51]. According to orn et al. [4], these deadwood structures are vital for biodiversity, forest recovery, and ecologically sustainable forest management.
Moreover, studies show that, by the end of the 20 th century, deadwood had already been recognized as a habitat for insects [4]. From these studies, some specialized insect biota has been found to require the presence of specific mycological species that are in turn linked with particular kinds of deadwood [52] or dead trees of specific species and a certain width and deterioration phase [53]. Deadwood has also been associated with promoting biodiversity at sophisticated trophic stages through expanding the availability of nutrition, providing shelter and resting points [4,12,[54][55][56][57][58][59][60][61]. However, measurement of below-ground deadwood and determination of how much deadwood should remain on or in the forest floor remain a challenging issue for most forest managers and scientists in the quest for ecologically sustainable forest management [15]. Nonetheless, deadwood constitutes an important carbon component in natural forest's biodiversity [4]. Unfortunately, in general, orn et al. [4] and Chojnacky and Heath [62] and emerging literature on the topic indicate that there is a significant reduction in the amount of deadwood in natural forests due to fuelwood and biomass stump removal, selective logging for high-value old trees, creation of firebreaks, reduction of fuel load during fire management, and charcoal production [63][64][65][66]. Interestingly, the literature validates the above findings regarding human interference by highlighting that the hidden sources of natural forest disturbances that usually follow habitat loss are driven by more complex socioeconomic factors, including population growth, policy failures, increasing consumption, technological changes, market failure, and improper awareness of biodiversity values [67][68][69].
Other studies appear to agree with the above findings in the literature by indicating that, in general, the causes of biodiversity loss are largely anthropogenic, especially sanctioned by the way humans produce and consume food and energy resources and the blatant disregard of the environment that is embedded in unsustainable economic development models [70]. Furthermore, studies show that, in the wake of existential threats such as climate change largely attributed to unsustainable anthropogenic activities, the planet has lost approximately 68% of animals, including mammals, birds, amphibians, and other life forms, between 1970 and 2016, representing 94% drop in the living planet index for the tropical subregions of America [70]. In addition, it is shocking that 99% of all life forms that ever existed on the earth are now extinct. Moreover, existing literature reveals that 80% of life forms remain 6 International Journal of Forestry Research undocumented [69]. Hochkirch et al. [71] concurred with these findings and cautioned that existential threats will continue to rise if concerted efforts are not initiated to mitigate biodiversity loss and climate change. In a disturbing revelation, the study notes that only a small proportion of birds, mammals, and amphibians have greater than 80% of their species assessed, but perhaps most importantly and perhaps with more direct links to the need for this study, Hochkirch et al. [71] indicated that the lack of species assessments is attributed to the lack of expertise, lack of human capacity, lack of funding, lack of public awareness, and political will. However, interestingly, in general, there appears to be concurrence that biological diversity is critical for the overall health of the planet's ecosystem. erefore, to enhance planetary health, a cultural and systematic shift in human production and consumption methods is required to protect biodiversity sufficiently. ese findings provide credence to this study and the need to enhance ecologically sustainable forest management as a way of conserving global forest biodiversity. Besides, forest management interventions and disturbances have been acknowledged as the key factors contributing to deadwood pools on the forest floor.

Strategies for Achieving Ecologically Sustainable Management of Deadwood
Existing literature has demonstrated that presently, the quantities of deadwood in natural forests are unstable. Interestingly, even though there are limited studies on the impacts of reducing deadwood in these forests through enrichment planting, deadwood is generally removed from forests in the form of fuelwood and stump biomass removal [64], selective logging targeting old trees [72], and deadwood collection for bioenergy [65]. Anthropogenic disturbances such as the creation of firebreaks are also associated with deadwood removal [63]. Due to the removal, orn et al. [4,65] indicated that the quantities of deadwood are on the decline, and this poses a threat to the biological diversity of natural forests contrary to the objectives of ESFM. Studies from European forests indicate that the diversity of saproxylic insects depends on dead or decaying wood. eir diversity is positively connected with the amount of deadwood available in the forest. Hence, it is important to incorporate more robust and sustainable deadwood management strategies [73]. Sustainable deadwood management strategies have been implemented in many Scandinavian countries [74]. Deadwood management strategies in Europe and most Scandinavian countries have largely involved putting in place measures and policies aimed at implementing the concept of bioeconomy where research and innovation in biological sciences are used as the basis for all economic activities and public benefit. Two dimensions are pursued in bioeconomy strategies and policies: firstly, the biotechnology innovation perspective where biological resources such as deadwood are identified in view of their immense contribution to sustainable economic growth value chains, employment, energy supply chains, and high standards of living and secondly, the resource substitution perspective that emerged largely as a result of efforts aimed at addressing climate change concerns, especially the following realization of the impacts of using fossil-based fuels. Studies report that efforts to promote bioeconomy-related policies and strategies that include deadwood have been largely successful in many European countries [75][76][77][78]. However, there are some slight variations in strategies and policies in terms of focusing. In some countries, strategies focus strictly on bioeconomy, whereas in others, strategies focus on aspects such as biotechnology and renewable energy. However, the underlying principles guiding these conceptual developments revolve around promoting resource use efficiency and the need to avoid the generation of waste, as shown in Figure 2. Bioeconomy is also linked to other approaches for implementing sustainable development such as the circular economy and green economy, which are increasingly being promoted as new ways of creating value and ultimately prosperity through extending the product life and relocating wastes from the end of the supply chain to the beginning and thus increasing resource use efficiency by using a resource more than once ( Figure 2). ese resource-use desires are in line with the goals of sustainable development, which encourages reusing raw materials as many times as possible to produce energy or other products and may be extended to the sustainable management of deadwood resources. However, the concept of bioeconomy has been contested on account of "green washing" and "the fundamental critique." [80,81] Regardless of criticisms, bioeconomy-related concepts that aim at promoting resource substitution and promoting biotechnology have a strong relationship with ecologically sustainable management of deadwood resources in view of the underlying principles that seek to ensure sustainability and can also be adopted in developing countries.
Nonetheless, in order to achieve ecologically sustainable forest management, two broad approaches are applied: active and passive enrichment [4]. Passive deadwood enrichment involves forest preservation processes where logging and other forms of anthropogenic disturbances are completely excluded from fostering naturally produced deadwood. Even though desirable, passive management may be challenging in young natural forests or formerly managed stands where the rate of deadwood formation is slow. However, passive management of deadwood may not be practicable in all regions because of the varying commercial interests and societal demand for timber and fuelwood [82]. Nevertheless, protected natural forests with no anthropogenic disturbances are more desirable for deadwood management and ESFM [83]. Active enrichment entails leaving parts of trees such as crowns or stem sections within harvest units [84]. Active enrichment has been found to increase deadwood amounts on the landscape level in young and formerly managed forests, thus enhancing biodiversity [85]. Other strategies involve the use of explosives and partial cutting of tree crowns [86]. Active and passive enrichment strategies can be applied in the tropics, where deadwood amounts increase if logging residues remain after selective logging [87].
Natural forest management strategies that involve deadwood enrichment can also be classified based on International Journal of Forestry Research silvicultural systems that are heavily economic based or ecological based. e economic basis focuses on production factor utilization and economic return [88]. In contrast, ecologically based systems focus on modifying natural conditions [89][90][91]. Duncker et al. [38] proposed forest management strategies based on forest management intensity that reflect a full range of social, economic, and environmental aspects of sustainability. Duncker et al. [38] found that regardless of forest management objects, the actions, including no action, affect forest status and processes and influence the biodiversity and the ecological conditions of a forest. Duncker et al. [38] thus proposed and described five forest management approaches, which were arranged along a gradient of the intensity of resource manipulation (from "passive" to "active"). Table 3 summarizes the five forest management approaches that have a strong correlation with the management of deadwood in a natural forest, which may also apply to deadwood resources' ecological management.
Moreover, even though there appear to be no studies that have established the optimum amounts of deadwood associated with each of these forest management approaches, the passive unmanaged nature reserve, the low close-tonature forestry, and the medium combined objective forestry may be the most appropriate approaches in relation to deadwood in natural forests and the general forest biodiversity and ecological functioning because there are minimal anthropogenic manipulations and natural regeneration appears to be the preferred type of forest restoration as shown in Table 3. However, the authors also note that even though other approaches such as combined objective forestry may be favorable for increasing the amount of deadwood on the forest floor, there is a need to exercise caution in order to balance risks of losing biological diversity and the economic impacts of biodiversity conservation. For instance, where natural forest stands are located adjacent to production forest stands, deadwood may enhance the proliferation of insect pests that may damage production forest stands leading to huge economic losses. Most Scandinavian countries have developed natural forest management policies that are cognizant of these risks. In Finland, forest management policy is oriented towards preserving deadwood by promoting biodiversity conservation through favoring mixed stand-in management, which favors increased amounts of deadwood under strict forest protection protocols. Biological diversity and deadwood are conserved by tree felling and application of silvicultural measures that leave deadwood and retention trees in a given habitat [92]. Interestingly, despite adopting such strict forest protection approaches, the country appears to be balancing very well between utilization of wood fuel from deadwood and biodiversity conservation. e use of wood-based fuels has been increasing since the 1990s and now accounts for 20% of the country's total consumption of energy [92]. Up to 75% of total energy consumption by forest industries is met by deadwood resources, making them self-sufficient.
Moreover, there appears to be a significant difference between deadwood volumes in managed and unmanaged forests in Finland, but generally, the mean volume is 5.8 m 3 / ha. Natural forests in Finland have deadwood volumes ranging between 40 and 70 m 3 /ha. However, these mean values cannot be reliable over a long period of time due to the differences in decomposition rates of deadwood [93].
Interestingly, it appears that the application of the deadwood manipulation approaches highlighted in Table 1 is achieving different deadwood yields in different countries depending on their development contexts. For instance, in Swedish forests, the average deadwood volume was estimated to be ca. 24 m 3 /ha which appears to be far below the expected natural values of 80-120 m 3 /ha [94]. Moreover, many European forests have revealed over 36 thresholds with 10-80 m 3 /ha for boreal and lowland forests and 10 to 150 m 3 /ha for montane forests [95]. Other studies estimate that the mean deadwood volume for European forests was   International Journal of Forestry Research 20.5 m 3 /ha, while without the Russian Federation, the amount drops to a paltry 10 m 3 /ha. Studies have established that these deadwood amounts vary depending on the vegetation zone, rate of decay, stand volume, and forest type [96]. Nevertheless, deadwood studies are increasingly shifting focus beyond mere biodiversity conservation and are now focused on exploring the link between deadwood and climate change, with interesting results being generated. For instance, a study conducted in Europe that sought to establish the amount of carbon in deadwood found that intensively managed forests have lower mean levels of deadwood carbon, while multifunctional management approaches resulted in the highest levels of deadwood carbon in the context of climate change [58]. Other studies have explored the rates of accumulation of deadwood on the forest floor and the attendant impacts of climate change on forest regeneration. For instance, Mazziota et al. [97], while modeling the effects of climate change and management effects on deadwood in boreal forests, found that the rising global temperatures would speed up tree growth leading to increased accumulation of deadwood. Still, the accompanying rise in decomposition rates will lead to reduced amounts of species-specific deadwood resources, thus impacting overall forest biodiversity in terms of species evenness and richness. erefore, all active approaches to the sustainable management of deadwood resources (Table 3) must exercise caution to ensure that displacement or replacement of deadwood must reflect the type of trees that must be planted in a given natural forest in order to avoid its extinction or disappearance from these forests. Besides impacting on the overall forest biological diversity, such active manipulation processes may have long-term consequences on how a particular natural forest is influenced by climate change. However, further studies that explore the impact of climate change on the rates of decomposition of deadwood in other forest types will be important in order to boldly carry forward this deadwood discourse into the context of ecologically sustainable forest management and hence the need for this study.
Nevertheless, there is an urgent need to raise the level of consciousness and awareness on the importance of bioeconomy and the ecologically sustainable management of deadwood resources in natural forests. According to orn et al. [4], many environmental education programs mention the importance of deadwood for conserving biodiversity in a general but rather superficial way mainly because of the low profile that is accorded to deadwood. In the light of this, there is an urgent need for developing educational programs targeting the health of natural forests in general and deadwood in particular through campaigns and visits. Also, it appears that deadwood's biodiversity lacks appealing characteristics for the nonscientific community who occasionally feel rarely represented in conservation efforts [97][98][99][100]. ese findings represent a major challenge for deadwood's importance in the general public and amongst scientists, policymakers, and forest managers and demonstrate the need for expanding the media and cultural linkages in deadwood awareness. However, the recent advances in "win-win" biocentric approaches to forest management as exemplified by the increasing need to involve adjacent forest communities in forest management and the growing feminist paradigms in the society are increasingly changing the classical way foresters have viewed good sustainable forest management practices. ere appears to be a growing propensity towards including the recognition of deadwood resources in natural forest management [100][101][102][103][104].
Interestingly, despite these paradigm changes, the existing literature indicates that the public appears less International Journal of Forestry Research concerned about the status of deadwood despite enjoying the cultural ecosystem services supported by deadwood resources in many natural forests [4]. Studies have shown that the aesthetic beauty of a landscape is affected by the density and diversity of trees, including deadwood [105], which attracts people to visit forests. Unfortunately, forests with large amounts of deadwood are viewed as chaotic, untidy, and destroyed [88,[106][107][108][109][110]. However, Pastorella et al. [111] showed that the preferred type of forests related to different management forms of deadwood (unmanaged forests, closeto-nature forests, extensively managed forests, and intensively managed forests). e study found that both components of deadwood were not perceived negatively by tourists and the public. More than 60% of respondents prefer unmanaged forests and close-to-nature managed forests, and 40% of respondents prefer intensively managed forests where the deadwood is removed during the treatments [58,112,113]. Nonetheless, more studies will be required to establish how these relatively new concepts shape the dynamics and management of deadwood resources in natural forest ecosystems, hence the need for this study in Kenya's context. In general, the educational programs aimed at raising awareness of deadwood need to be fashioned to help overcome the seemingly negative attitude presented above and address unsustainable energy resources' demands. Different countries seem to be adopting different awareness strategies based on their development contexts. For instance, orn et al. [4] reported that deadwood educational programs applied in Europe include guided forest visits with groups of people and rely on informative outdoor exhibits focusing on deadwood species, nutrient cycles, and the natural decay of large, old trees. Furthermore, the study notes that such educational forest visits could enhance conservation-related knowledge and long-term retention of gained knowledge. Other more promising approaches include adapting the flagship-species concept to environmental education programs [99]. A particular taxon is highlighted and used to stimulate interest in the ecological importance of deadwood. Studies have established that flagship species from higher trophic levels in saproxylic food webs, such as birds or mammals, could foster positive attitudes toward deadwood, for example, the barbastelle bat (Barbastella barbastellus), which uses deadwood and forest stands decimated by bark beetles as nesting, roosting, and foraging sites [114]. Moreover, flagship species can be used in children's books and other educational programs to communicate deadwood preservation, thus reaching a much bigger audience. However, orn et al. [4] pointed out that the efficacy of deadwood-specific programs remains mostly unknown, and to ensure efficacy, such programs must be subject to quantitative evaluation, measuring success via the presence and quality of deadwood and associated biodiversity, in addition to the human dimensions of forest ecosystems. Greater focus on interdisciplinary research is also needed to identify knowledge gaps and divergent opinions on deadwood and be targeted with specific educational programs such as the use of video games [115]. Hochkirch et al. [71] proposed the use of the International Union for Conservation of Nature's (IUCN) red list of endangered species as a source of reliable information in order to create more holistic, robust, and effective conservation actions. Moreover, the study recommends the need to revive exploratory field research to facilitate knowledge transfer, link taxonomy information to conservation information, improve the global collation of spatial biodiversity data, mapping of spatial threat data, automation of preassessments, creating biodiversity monitoring programs for lesser-known taxa, and mobilization of funds to fill knowledge gaps.

Challenges to the Ecologically Sustainable Management of Deadwood in Kenya
As already outlined, public natural forests are principally managed by the government through the Kenya Forest Service to provide many ecosystem services, for instance, the provision of fuelwood to adjacent forest communities [24]. Moreover, it has been documented that more than 10% of households living within 5 km of forest reserves depend on them for subsistence resources [18]. Also, forests represent up to 3.6% of the country's GDP. However, inconsistencies in reporting on the share of the forest's contribution to GDP need to be resolved if forests are rated highly and sustainably conserved in the country. More rigorous analysis is required to increase forests' and tree valuation based on their overall economic value to increase conservation consciousness amongst individuals and communities. ere are indications that such valuations will be conducted in the country following a recent assessment of the Mau Forest Complex, Cherangany Hills, and Mt. Elgon ecosystems, which established the total economic value (TEV) of the three water tower ecosystems at Kshs. 362 billion per year (ca. 5.0% GDP in 2017), as portrayed in Table 4.
Moreover, the existing literature shows that the public per capita wood demand was 1 m 3 every year, and yet, public forests have a sustainable wood fuel yield of 0.9 m 3 per ha per year [23]. With the current population standing at 47 million in 2019, the per capita wood demand rose from 38 m 3 in 2009 to 47 m 3 in 2019. Wood fuel sourced from state forests is the common type of biomass energy in Kenya, contributing ca. 70% of the public energy demand, while about 90% of Kenyan country families use wood fuel or charcoal [23]. Additionally, wood fuel meets over 93% of rustic family energy needs, while charcoal is the dominant energy source in metropolitan families [116]. Firewood sourced from gazetted forests is mainly used for cooking, water heating, house heating, lighting, and other home businesses. Households are the most important category in wood energy consumption, with an estimated consumption of 6.5 tons per household per year [117]. e second highest wood fuel consumer is the cottage industries, including brickmaking, tobacco curing, fish smoking, jaggery, and bakeries. Others include small restaurants/hotels and kiosks and learning institutions. Given the importance of cottage industries in income and employment generation and wealth creation for the rural population, their energy requirements need specific attention to ensure their sustainability. On average, most cottage industries use between 20 and 30% of the total operating costs on energy, which is mainly from wood [118]. Despite this significance, wood fuel demand and supply information remains scanty and has a high degree of uncertainty, making wood energy policy formulation a daunting task [113]. e above complex development challenges revolving around the use of wood for energy and other uses have had somewhat far-reaching impacts on Kenya's forests. According to Wass [119], the presence of stumps in forests represents an important indicator of fuelwood use and, by extension, deadwood's presence. Wass [119] acknowledges that even though firewood removal may be practical in the context of developing countries such as Kenya, unregulated removal may have some far-reaching negative consequences on overall biodiversity conservation, especially in natural forests. For example, the report indicates that, in some parts of Kakamega Forest, a western rainforest (Table 2), holenesting forest birds declined because dead branches in which they make nest holes have been removed, and one part of Kakamega showed no signs of wood-eating termites because there was no deadwood on the ground. Furthermore, it is common under these conditions for fuelwood collectors to ringbark trees so that there are future deadwood supplies, thereby accelerating offtake. In the coastal and Nairobi forests, Brachylaena huillensis is the preferred fuelwood and the most important wood used in carving items for sale to tourists. Species-focused removal of this tree has led to the loss of all large trees in Arabuko Sokoke and severe declines in the Nairobi forests. Some special commercial importance trees may be so reduced in numbers so that their populations may no longer be viable. For example, Milicia excelsa (mvule) has been exploited for timber from the coastal forests for decades, and Vitex keniensis (Meru oak) and Olea capensis (Cape olive) are in a similar state of decline in the montane forests. It is not clear to what extent forest bird species have been lost in Kenya due to habitat degradation and fragmentation caused by logging. However, some bird species have not been reported in Kakamega rainforest for several years. ese findings by Wass [119] are mainly in agreement with other studies that have established that much of the closed-canopy forests have been depleted due to internal and external influences resulting in significant biodiversity losses [120]. Besides, even though policies and legal frameworks governing wood production and utilization in Kenya aim to ensure sustainability, their effectiveness has not been realized as there is an imbalance where supply is lower than demand. e supply is low because possible optimal targets have not been reached due to inadequate management practices, low forest areas that are continually being lost to agriculture, settlements, and other developments. At the same time, demand is high because of the increasing population, excessive dependence on wood, and wasteful processing and utilization technologies [120]. ese factors affect sustainable deadwood management in natural forests as well. Moreover, forest fires have been widely reported in Kenya's Forest Resource Assessment Reports by the Food and Agricultural Organization of the United Nations as the greatest cause of damage to natural forests by burning biodiversity [112]. However, the impact of these fires on the quantity and biological diversity of deadwood resources remains unexplored. Kenya's Forest Resource Assessment Report for 2015 appears to reinforce Wass's [119] findings on a scarcity of deadwood information and its impacts. e report provides default figures for deadwood in Kenya's forests. It estimated that the proportion of deadwood in standing biomass was 0.0177 without giving any further information on inventory protocols used and parameters that were assessed.
us, it is important to awaken the consciousness on sustainable management of deadwood resources in the country and devise measures for ensuring its sustainability. e initial steps would involve upscale efforts towards ecologically sustainable forest management where all biodiversity resources in natural forests, including birds, animals, and others, are documented in efforts aimed at establishing scientific records for each natural forest in Kenya, hence the need for this study.

Deadwood Awareness Initiatives in Kenya
ere are many policy and extra policy initiatives that are currently under implementation to encourage the ecologically sustainable management of deadwood resources in gazetted natural forests and the general environment at large. For example, Kenya's National Biodiversity Strategy and Action Plan for the period 2019-2030 recognizes and outlines many causes of biodiversity loss, including deadwood. For example, the action plan identifies cultural attitudes toward deadwood as having a strong bearing on species and biodiversity conservation status. Even though studies have not been done to establish this claim, Kenya's government appears to have rolled out several initiatives aimed at addressing her biodiversity conservation concerns.
Nonetheless, the sustainable conservation of deadwood resources in Kenya is broadly guided by the National Biodiversity Strategy and Action Plan, whose provisions for the period 2019-2030 are in line with the Aichi targets and the objectives of the Convention on Biological Diversity (CBD). e document considers that biodiversity conservation is essential for our existence and basically valuable in its own right. e document outlines educational programs' centrality through workshops, seminars, public meetings, conferences, "seeing-is-believing" tours, and participation in national and international days with themes related to biodiversity conservation. Mass media platforms such as radio, television, newspapers, sectoral websites, short message service, social media, and e-mail complement the educational platforms and enable broader audience access to repackaged information [121]. However, studies on the effectiveness of these outreach programs in deadwood and natural forest conservation are needed. Also, there are many stakeholders involved in the management of natural forests in the country. ey include the media, higher-learning institutions (colleges and universities), faith-based organizations, private sector agencies, and government agencies [18]. Cognizant of this fact, in 2019, the state's forest manager (Kenya Forest Service-KFS) enhanced the existing PFM framework's multistakeholder capabilities by introducing a collaboration framework that allows greater participation of corporate bodies and individuals in forest management, including awareness creation.
Other initiatives that extend to deadwood awareness include implementing the national strategy for achieving and maintaining 10% forest cover, which covers the rehabilitation of natural forests, which are deadwood sources under examination in this study. e strategy document spells out a raft of measures for ensuring sustainability, including public awareness, education, and sensitization on the importance of forests through media campaigns, print, electronic, and social media platforms. However, perhaps more radically, the strategy proposes reviewing primary and secondary schools' teaching curriculum to include sustainable forest management, organizing field days and exhibitions, and showcasing sustainable deadwood management events. In addition, the strategy aims at improving wood conversion and utilization of alternative energy sources through processes such as ecolabeling, use of efficient cookstoves, use of alternative energy sources such as solar, wind, liquid petroleum gas (LPG), biogas, and briquettes, and provision of incentives and awards to promoters of best practices as well as research in forest restoration. Moreover, Kenya submitted her Nationally Determined Contributions (NDC) with regard to carbon emissions, where the country increased her target to 32% from the initial 30% [122]. A number of robust strategies are highlighted in the NDC, including cutting down on the use of biomass energy resources, which appear to be used by many Kenyans, whereas these efforts are laudable, and sustainable deadwood management-specific programs do not feature prominently in these key forest management policy documents. us, it will be important to raise consciousness and reemphasize the centrality of deadwood in the context of the ecologically sustainable management of natural forests in Kenya.

Discussion
Natural forests are important biodiversity reservoirs with many organisms that create biological balance globally [1,2,25,121]. e ecological and biological balance created is important for supporting human existence and development through the provision of vital ecosystem services [18,25,28,30,31]. Hence, discourses on the need to integrate sustainable forest-based economic development and biodiversity conservation have dominated the globe, leading to the emergence of new forest management concepts. e quest for new conceptual changes is mainly being driven by the weaknesses of the sustainable development theory and its derivatives such as SFM. SD and its derivatives have been contested on account of being open to many interpretations, and there is a problem with creating sustainability indicators [45,46].
Consequently, other concepts such as ESFM are increasingly becoming popular, albeit in certain regions of the globe in the context of forest management. e primary goals of ESFM are maintaining the vitality of forest ecosystems, which covers ecological processes within forests, maintaining the biological diversity of forests, and managing the net social benefit derived from the mixture of forest uses [47,48]. Interestingly, this study has revealed that the above goals are similar to the goals of other emerging concepts such as bioeconomy, green economy, and circular economy that seek to promote sustainable forest management in the wake of climate change [75][76][77][78][79].
Results from Kenya exemplify the above global-level findings of the importance of biodiversity conservation. e country has a huge and quite diverse natural forest resource base (Figure 1) that is contributing to the balance between the environment and socioeconomic transformation (Tables 2-4; Draft Forest Policy [18]; National Strategy towards 10% Tree Cover 2019; MEF [122]; Wambugu et al. [24]). Interestingly, Kenya also appreciates the changing conceptual environment of natural forest management by developing, reviewing, and adopting relatively robust forest management policies such as participatory forest management, which is mainly compatible with ESFM in many respects. However, perhaps more interestingly in this study, the highlighted conceptual changes are increasingly changing the classical way foresters have viewed good forest management practices in Kenya and beyond [100][101][102][103][104].
ese policy changes are also increasingly being applied in the sustainable management of natural forests.
Deadwood in natural forests plays an important role in advancing discourses on the above sustainable forest management conceptual changes because it is a critical component in the process and function of natural forests with direct links to enhancing the achievement of ESFM, bioeconomy, and circular economy [4-6, 9, 10, 13, 51, 54, 57, 59, 61, 62, 113]. Also, even though the global literature has extensively defined deadwood from the perspective of ESFM as reported by Mark et al. [14], Hezron [9], Wu et al. [16], and Merganičová et al. [15], forest policy guidelines in Kenya do not explicitly define deadwood. Hence, no specific sustainable deadwood management guidelines are in place to ensure its sustainable conservation in the wake of complex development challenges such as loss of biological diversity and climate change. However, based on the deadwood definition given by Wu et al. [16] and Merganičová et al. [15] where deadwood encompasses barks and firewood on the forest floor, deadwood is only being implied in the Forest Conservation and Management Act [19] through a list of forest produce where barks and firewood are mentioned as indicated in the following; forest produce includes bark, animal droppings, beeswax, canes, charcoal, creepers, earth, fiber, firewood, frankincense, fruit, galls, grass, gum, honey, leaves, flowers, limestone, moss, murram, soil, myrrh, peat, plants, reeds, resin, rushes, rubber, sap, soil, seeds, spices, stones, timber, trees, water, wax, withies, and such other things as may be declared by the Cabinet Secretary to be forest produce for this act, p.8.
Unfortunately, Wass [119] appears to be the only scientific authority in Kenya that has cited deadwood, but in the context of biodiversity conservation. While cautioning on the negative impacts of fuelwood removal on deadwood and the regeneration of natural forests, Wass [119] illustrated that fuelwood removal does not necessarily lead to biodiversity loss. Still, high levels of removal could cause biodiversity loss, whereas this study agrees with Wass [119]; the authors observe that this finding was published almost two decades ago. A lot may have changed over time, especially with regard to socioeconomic advancements that have occurred in the country. Moreover, since 1995 when the study was undertaken, there is a scarcity of proceeding studies focusing on deadwood. Hence, we cannot ascertain the notion of "high levels of removal" as suggested by Wass [119]. However and perhaps most importantly, Wass [119] gave some examples of natural forests where biodiversity loss may have occurred due to deadwood removal. It may have affected ESFM, bioeconomy of natural forests, and the circular economy in the country. e study identified the Kakamega rainforest, coastal, Nairobi, and montane forests as affected forests. ese forests represent crucial natural forest ecosystems listed in Table 2 and are linked to promoting ecological balance, human well-being, and economic development. Oduor and Githiomi [120] reinforced these biodiversity loss fears in the context of unsustainable fuelwood extraction in Kenya's natural forests. However, perhaps more importantly, these examples of biodiversity loss, which extend to deadwood, reinforce the findings in reviewed global-level literature and the central themes of this paper with regard to the importance of deadwood and the need to put in place robust and actionable specific programs targeting sustainable management of deadwood resources.
e Forest Conservation and Management Act [19] spells out somewhat robust natural forest management objectives where deadwood falls under this discussion. e objectives include conservation of water, soil and biodiversity, riparian and shoreline protection, cultural use and heritage, recreation and tourism, sustainable production of wood and nonwood products, carbon sequestration and other environmental services, education and research purposes, habitat for wildlife in terrestrial forests, and fisheries in mangrove forests. In general, these objectives are in line with the three goals of ESFM, and thus, deadwood management, in this case, could fall under the "sustainable production of wood and nonwood products objectives." However, to date, there are no guidelines for the sustainable production of wood and nonwood products from natural forests in Kenya, which affects the ESFM of deadwood in these forests. Besides, it is shocking that key forest management policy documents reviewed in this study, for instance, the Draft Forest Policy [18], the National Strategy for Achieving and Maintaining 10% Forest Cover by 2022, the Forest Management Technical Orders of 1996, and the National Biodiversity Strategy and Action Plan for the period 2019-2030, do not have explicit provisions on sustainable management of deadwood resources.
ere are only general provisions for sustainable management and rehabilitation of natural forests hence posing a real great threat to deadwood management in the context of ESFM. On the contrary, global-level literature has highlighted the centrality of sustainable deadwood management-specific guidelines in countries with robust natural forest management regimes such as Finland, Sweden, and other European countries and how these resources are contributing to bioeconomy and circular economy in these countries [4, 58, 65, 75-79, 92, 95].
It is therefore essential to reiterate that although critical policy guidelines on natural forest management and available literature on the contribution of deadwood to the three goals of ESFM in Kenya appear scanty, global literature has shown that deadwood is essential for maintaining the biological and ecological balance through enhancing natural forest vitality and health and biodiversity and contributes to International Journal of Forestry Research 13 net communal social benefits in a circular economy. In this regard, many developed countries have developed robust deadwood management strategies, including active and passive enrichment to conserve deadwood resources [4,74,84,85]. Moreover, the reviewed literature indicates that both active and passive enrichment with deadwood are applicable in many situations, including in the tropics [87]. Kenya is a tropical African country, and hence, these approaches may be relevant and applicable. However, it is essential to conduct location-specific studies on their practicability, given its complex biological and socioeconomic circumstances. Besides, other countries have actively pursued, created, and managed deadwood resources in their natural forests using explosives and partial cutting of tree crowns, as illustrated by Speight [86], and retention felling in natural forests as in the case of Finland [92,93]. Table 3 has summarized other forest management approaches that could apply to natural forests that harbor deadwood as a critical component. However, the combined objective forestry (Table 3) appears to be the most compatible with the robust management of deadwood resources in the context of ecologically sustainable management of forests. Unfortunately, despite the good examples of sustainable forest management interventions highlighted above, the reviewed literature suggests that deadwood in natural forests appears to be declining globally, presenting a challenge to ESFM [4,65]. e key factors identified to be causing the decline are anthropogenic forest management processes and disturbances through fuelwood collection, charcoal production, firebreak management, and unsustainable logging practices and other biotic stresses [63,64,66,72]. Similarly, in Kenya, apart from what was observed almost two decades ago by Wass [119], deadwood appears to be declining in most natural forests because forest management in the country appears to have been greatly influenced by the legacies of colonial forest management objectives, which were fixated on merchantable wood production in plantation/production forests for the government's revenue generation with utter disregards for deadwood resources from natural forests in view of its perceived low economic or no commercial value. To underscore this point, currently, the policy guidelines on the conservation and enrichment of natural forests allow minimal deadwood removal in the form of firewood for domestic purposes [24]. Interestingly, there is no threshold for estimating the so-called "minimal deadwood removal" in the form of fuelwood by adjacent forest communities, thus begging the question, "how minimal is minimal removal?" e reviewed literature shows that fuelwood from natural forests is extracted by adjacent forest communities upon payment for a monthly fuelwood license (MFL) worth Kshs. 100 (US $1) to the government through the Kenya Forest Service. In the current fuelwood extraction practice, as long as one has a valid MFL, one is only allowed to pick "dead" and "fallen" wood from the forest floor without any restriction on the frequency of extraction. Moreover, due to inadequacy of staff and other forest management challenges at the Kenya Forest Service, especially the presence of few forest enforcement officers, this study observes that it is difficult to monitor whether those with valid MFL only pick "dead and fallen wood." Also, it is difficult for adjacent forest communities fetching firewood to define the term "dead" in the context of firewood while on the forest floor. With this hindsight, the proper definition of what constitutes deadwood is required because the reviewed literature has indicated that even though deadwood may be literally dead from the face of it, it may be providing a habitat for other rare and endangered biological organisms in the forest. erefore, could this "minimal removal of fuelwood" management approach of natural forests in Kenya be akin to trying to manage what we do not know given the vital role played by deadwood in ecologically sustainable forest management and related concepts such as bioeconomy and circular economy? Nonetheless, in Kenya's context, it can be generally understood that the minimal removal of fuelwood is based on the edicts of the concept of sustainable development and its derivatives, which have been found problematic [45,46]. However, this study observes that caution should be exercised in view of emerging conceptual changes and what earlier studies have documented regarding natural forests in the country. For instance, Wass [119] reported that degradation and exploitation of natural forests for fuelwood had significantly impacted four important tree species in the country, namely, Brachylaena huillensis, Milicia excelsa, Vitex keniensis, and Olea capensis. In this study, the authors observe that, without a robust biological diversity monitoring system for these species, the country risks driving these important biological resources into extinction if robust strategies and policies are not put in place to check the rising per capita firewood removal from natural forests. To highlight the impending biodiversity risk, a quick fact checks in the IUCN red list which identifies Brachylaena huillensis and Milicia excelsa as near-threatened tree species with unspecified population trends in the wild, including natural forest areas. Vitex keniensis is classified as an endangered species, and its population across the world biosphere was declining fast, according to the IUCN. Even though Olea capensis is listed as a tree species of least concern with a stable population trend in the IUCN red list, there is a need to put in place some robust measures that will guarantee its existence in the future in the context of ecologically sustainable forest management and related approaches. In addition, even though, the highlighted "minimal firewood removal" policy provision may be appropriate for Kenya, given the current complex socialeconomic development realities where over 70% of the population uses biomass energy resources and the demand for it appears to be rising. With the growing human population now standing at 47 million people, which is reportedly increasing by 2.3% per annum, the demand for deadwood from natural forest ecosystems is likely to increase, leading to loss of biodiversity and a severe deadwood management crisis. Existing scientific literature such as Oduor and Githiomi [120] has reinforced these findings by demonstrating that although policies and legal frameworks governing wood (including deadwood such as fuelwood) production and utilization in Kenya aim at ensuring sustainability, their effectiveness has not been realized as there exists an imbalance where supply is lower than demand occasioned by population growth, wasteful processing, and utilization technologies amongst other complex sociotechnical factors. However, in this context, unlike other countries where deadwood is actively managed with robust guidelines, Kenya's scenario may be dire due to the absence of knowledge about the importance, quantification, and sustainable management strategies for deadwood.
Furthermore, the country's overall environmental challenges may worsen with the risk of escalating biodiversity loss occasioned by unsustainable biomass energy resources' exploitation. Mugo [117] noted that even though wood energy is important in the country, wood fuel data on supply and demand are scarce and characterized by a high degree of uncertainty that makes it difficult to undertake relevant wood energy planning and policy formulation. Moreover, households have been cited as the greatest consumers of wood using approximately 6.5 tons per household per year, multiply that consumption level with 12.2 million households in the country, and the wood requirement is unimaginable in an environment where the quantity of available deadwood resources in our natural forests is unknown. Besides the threats of losing the country's biological diversity through burning for energy needs, the country risks escalating the threat of climate change by failing to achieve her carbon emission targets in the recently submitted Nationally Determined Contributions in accordance with the Paris Agreement. However and perhaps most importantly, Mugo [117] and Ngui et al. [118] recommended the need to reevaluate energy requirements to ensure sustainability, hence reemphasizing the central themes of this paper. Interestingly, the reviewed literature appreciates this policy, sociotechnical, and economic development complexities facing the country. However, more importantly, they acknowledge that these challenges have the potential to cause habitat loss, and this may also encompass loss of deadwood, especially in the context where the population appears to be growing rapidly, such as Kenya and other developing countries [67,68,123]. erefore, urgent and decisive action is needed to develop ecologically sustainable deadwood management guidelines to avert an impending natural forest management crisis in the country.
Nevertheless, all is not lost as it may appear to be that Kenya's development scenario offers a number of opportunities for enhancing ESFM and related approaches such as bioeconomy with the focus on deadwood. e existing PFM framework where people's livelihoods and forest conservation objectives are integrated with natural forest management objectives appears to be more compatible with the three goals of ESFM and associated approaches, and they could be further integrated for greater conservation of deadwood in the country. Developing PFM strategies with specific programs focusing on deadwood may enhance the sharing of ecosystem services derived from deadwood resources with the adjacent forest communities, thereby enhancing their ESFM by promoting the net social benefits that accrue to communities. is approach could foster greater recognition and acceptance of deadwood by the public. In fact, Wambugu et al. [24] demonstrated that communities' recognition and involvement in processes that involve the sharing of ecosystem services improve forest management outcomes toward greater sustainability. However, a natural resource benefit-sharing policy lacks in the country, and the country lacks data on the total economic value of all natural forests similar to data contained in Table 4. ese are real challenges that could slow sustainable deadwood management in the country through PFM.
Participatory forest management represents a good opportunity for challenging the negative attitude, indifference, and the seemingly low profile that appears to be accorded to deadwood, as indicated by orn et al. [4,65].
ese studies indicated that the public is always less concerned with deadwood's presence despite enjoying most of its cultural ecosystem services [4]. Daniel et al. [105] showed that the density of deadwood affects aesthetic beauty from an ecotourism perspective for most forest goers. Other studies have shown that forests with large amounts of deadwood are unattractive to the public and are viewed as chaotic, untidy, and ruined [106][107][108][109][110]. Similarly, in Kenya, even though not as explicit as in the studies mentioned earlier, the National Biodiversity Strategy and Action Plan for 2019-2030 identifies negative attitude and complex cultural factors among the key issues hindering biodiversity conservation and which could be extrapolated to deadwood management as well. e current natural forest management approach, which incorporates PFM, can challenge and overcome these challenges if well implemented. PFM is implemented in the country through participatory forest management plans, where management programs are developed based on a given forest's biological and socioeconomic composition and realities. Most management plans which appear to be premised on the ecosystem approach principles have the scientific and education program which could be leveraged for sustainable management of deadwood resources. However, the creation of specific educational programs that target deadwood in natural forests has been lauded and considered most appropriate in reemphasizing the importance of deadwood by many findings [4]. In this paper, the authors emphasize that specific deadwood programs may be preferable in the participatory forest management plans because the existing scientific and educational programs' efficacies remain mostly unknown due to the absence of studies and may not be relied upon for the promotion of deadwood awareness. Besides exploring the opportunities presented by the framework of collaboration between KFS and corporate bodies where universities and other interested parties could be brought on board to conduct deadwood management studies, it will also be essential to escalating specific deadwood programs through workshops, seminars, public meetings, conferences, "seeing-is-believing" tours, and participation in national and international days with themes related to biodiversity. Mass media platforms such as radio, television, newspapers, sectoral websites, social media, and e-mail are indicated in the National Biodiversity Strategy and Action Plan for 2019-2030. ere is a need for full implementation of the above programs because similar approaches have been supported by the existing literature [71,99,115]. ese outreach programs appear to be appropriate for deadwood management because their International Journal of Forestry Research implementation will likely impact various demographic groups present in Kenya. However, studies on the demographic preferences for messages on deadwood should be conducted to determine their effectiveness and relative advantages. Besides, due to the anticipated impacts of sustained deadwood outreach programs, there may be a need to create a compensation scheme for those who lose livelihood in the fuelwood value chain. Such strategies were proposed by orn et al. [4], even though applied in the European context, but subject to studies, and they could be replicated in Kenya [124][125][126][127][128].

Conclusion and Recommendations
Deadwood in natural forest ecosystems plays an important role in maintaining a balance in natural forest processes and functions. However, natural forest degradation through the removal of deadwood, even though widely neglected, results in considerable biodiversity loss and alters natural forests with the risk of escalating the negative impacts of climate change. Kenya's case has substantiated these findings from the perspective of ESFM and demonstrated that reducing forest degradation in the future will require the restoration of deadwood and increasing public awareness and consciousness on the importance of deadwood for biodiversity conservation and maintaining forest ecological functions. To reduce further degradation and promote ESFM, this paper recommends (1) Conducting location-specific studies on the importance of deadwood, quantity, public attitudes, management strategies, and impacts on biodiversity conservation (2) Scientifically documenting the biological diversity of natural forests (3) Reviewing primary and secondary schools' teaching curriculum to include sustainable forest management (4) Undertaking the total economic valuation of natural forests (5) Developing specific guidelines for sustainable management of deadwood in natural forest ecosystems (6) Enacting the natural resource benefit-sharing legislation which will foster sharing of ecosystem services, including those provided by deadwood (7) Reviewing the existing tools for sustainable forest management such as participatory forest management plans and Technical Orders of 1996 to incorporate robust and specific deadwood management programs with clear, measurable indicators (8) Introducing public awareness and educational programs such as campaigns and field visits that emphasize the importance of deadwood management and developing a location-specific deadwood resuscitation pilot project (9) Provision of incentives for enhancing the use of alternative energy sources apart from fuelwood and reducing the use of biomass energy resources (10) Providing compensation for those who lose livelihood as a result of collapsing the fuelwood value chain (11) Enhancing international cooperation in the enforcement of guidelines for ecologically sustainable forest management (12) Conducting studies to evaluate the effectiveness of the current deadwood management awareness approaches (13) Conducting studies to gauge people's perceptions towards deadwood resources and the application of biotechnology in its sustainable management (14) Expanding the cultural and media linkages in sustainable conservation of deadwood resources Data Availability e forest type data used to support the findings of this study are included within the article.

Conflicts of Interest
e authors declare that they have no conflicts of interest.