Spatiotemporal Evolution and Influencing Factors of Ecological Civilization Construction in China

/e construction of an ecological civilization is a strategic idea proposed based on the conditions of different countries and the laws governing social development. It is a new way to promote harmonious coexistence between humans and nature. /erefore, exploring the evolution characteristics and influence of ecological civilization in China is helpful for the country’s future development. /is study uses the pentagon model, panel threshold regression model, and spatial analysis tool to explore the law of space-time differentiation and analyze regional coordination and ecological civilization construction in 31 provinces, cities, and autonomous regions in China from 2000 to 2018. During the study period, the construction of ecological civilization in China generally fluctuated; the spatial differentiation pattern of the eastern region was more developed than that of the central region, which was more developed than that of the western region. /e regional coordination degree decreased in the order of east >central >northeast >west, and the degree of coordination in provinces and cities gradually shifted and finally accumulated to be reflected in the economy and environment in 2018. /e most important factor affecting the development of ecological civilization was determined to be scientific research, followed by air quality and government information disclosure.


Introduction
In the middle of the 20 th century, to improve the living standards, many countries entered into a development phase aimed at vigorously pursuing economic growth, which caused environmental problems such as global warming, shortage of freshwater resources, and air pollution. Although most developed countries have implemented pollution control strategies to address these problems, there is a lack of such measures in China.
us, China faces greater environmental challenges than other countries. erefore, exploring the development of ecological civilization construction will not only help improve economic and social development but also greatly enhance the international status of China.
In the early days of reforms and opening-up, the Communist Party of China (CPC) proposed to balance the economic and environmental development and added the concept of sustainable development in the reports of the 15 th and 16 th National Congress of the CPC, which advocated the coordinated development of the ecological environment with the economy, society, institution, and culture. e concept of ecological civilization construction was first proposed as a major development strategy in the 17 th National Congress of the CPC. In the report of the 18 th National Congress, the CPC further elaborated that "building an ecological civilization is a long-term and grand plan that concerns the well-being of the people and the future of the nation" [1]. In the Fifth Plenary Session of the 18 th CPC Central Committee, strengthening the level of ecological civilization was added to the national five-year plan for the first time, and the report of the 19 th National Congress of the CPC reaffirmed the establishment of the socialist ecological civilization. e connotation of the construction of ecological civilization has been proposed in both a broad and specific sense. In the broad sense, the construction of ecological civilization is a systems engineering approach that integrates the economic, political, cultural, and social construction systems to save natural resources and protect the environment [2,3]. In the specific sense, it involves improving relationships between humans and nature, treating nature with a civilized and rational attitude, opposing the extensive use of resources, and building and protecting the ecological environment [4]. erefore, we should achieve the coordinated development of man and nature, resources and economy, and environment and society. We should also realize the protection of the ecological environment and sustainable utilization of resources by constructing a "green economy" and a "green society." Based on these definitions, this study summarizes the broad and narrow connotations of the construction of ecological civilization. e core of this idea comprises social, environmental, economic, cultural, and institutional construction as a whole, emphasizing the need for coordination among them.
At present, most researches on sustainable development [5,6], with construction of ecological civilization, a component of it, mainly focuses on the associated evaluation system and research methods and approaches. (1) A consensus regarding the evaluation system of ecological civilization construction has not yet been arrived at by scholars and can be roughly divided into three approaches. e first type involves evaluating the construction of ecological civilization from three levels of society, economy, and nature [7][8][9]. For example, Mi et al. [10] took the three systems of "society-economy-nature" as a theoretical basis to construct an evaluation system of ecological civilization construction with the model of "pressure-state-response." e second approach is mainly based on the content of the Measures for Evaluation and Assessment of Ecological Civilization Construction Objectives, of which the system incorporates seven aspects: resource utilization, environmental governance, environmental quality, ecological protection, growth quality, green life, and public satisfaction [11]. e third approach involves the integration of the first two. Some of the indicators are selected for targeted evaluation studies. For example, Deng et al. [12] and others set up an evaluation system comprising the four levels of territorial space, resources, ecological environment, and the system as a whole, and Bi et al. [13] evaluated the construction of ecological civilization from the four aspects of land space, resources and environment, economy and society, and system guarantee. (2) Research methods can be divided into three groups: evaluation method, regional coordination, and influencing factors. e evaluation methods include coefficient of variation [14], pressure-state-response (PSR) model [15], backpropagation (BP) neural network model [16], slacks-based measure (SBM) model with undesired outputs [17], and the double-benchmark progressive method [18]. (3) e study of regional coordination can be divided into two parts: regional coordination and intraregional system coordination. Zhang et al. [19] used the data envelopment analysis (DEA) method to analyze the coordination degree of regional ecological civilization construction in China. Feng et al. [20] conducted a coordinated study on the environment, economy, society, and institutional components of ecological civilization construction in Hebei Province using the principle of coefficient of variation. e influencing factors were determined using factor analysis [21], regression models [22], and spatial econometric models [23]. Most existing studies focus on the construction of a certain type of ecological civilization or analyze a certain aspect from the perspective of ecological civilization. For example, Zhong et al. [24] used the method of systematic review to compare the data on ecotourism in China from 1992 to 2015. Ren et al. [25] integrated ecological civilization into university education and established a comprehensive evaluation system of ecological civilization education in colleges and universities. Wang et al. [26] analyzed the significance, status, and problems of agricultural green development in China based on the development of ecological civilization by reviewing relevant literature.
To sum up, based on the existing research, this paper reconstructs a reasonable and scientific evaluation system of ecological civilization construction. Based on the current literature, the legal index is added at the system level, and according to the overall development status, the cultural system is added to the original system, with cultural and intangible heritage, education level, and other indicators added to fill it. Finally, the construction of ecological civilization is divided into society, environment, economy, culture, and system to define the basic connotation of China's ecological civilization construction. e paper discusses the spatiotemporal evolution of ecological civilization construction and explores the degree of coordination and deviation between regions and systems within regions using the pentagon model for the first time. e panel threshold model is used to analyze the influencing factors, which can be used as a reference for promoting the socialist modernization of China.

Construction of Index System and Data Sources.
Based on the core of ecological civilization construction and with reference to the existing research findings [7][8][9][10][11][12][13], the reports of the 18 th and 19 th National Congress of the CPC, and the national assessment methods for ecological civilization construction objectives, we regrouped the indicators of land space, resource utilization, environmental governance, environmental quality, ecological protection, growth quality, green life, and public satisfaction into social, environmental, economic, and institutional systems. e social system includes indicators such as regional urbanization, population, infrastructure construction, and medical treatment and covers green living, consumption, and service level.
e environmental system reflects the influence of regional development on the local ecological environment, including air quality, environmental protection, and emissions control and treatment. e economic system covers aspects such as the quality of growth and industrial structure. To balance the pace and quality of economic development in the construction of ecological civilization, two indicators were added to measure economic consumption: water and energy consumption per unit gross domestic product (GDP). Since the institutional system is limited to the market level, legal indicators, such as crime rate, local legislation, and the number of corrupt individuals, were incorporated to form a new system. As the construction of ecological civilization entails the coordinated development of a complex and pluralistic system, new indicators such as national heritage, world cultural heritage, national cultural unit, education level, and the number of libraries were added to construct a cultural system to measure the degree of regional civilization. Finally, an index was constructed with five subsystems: social development, green environment, economic growth, cultural heritage, and institutional system (Table 1).
Considering the availability of data, this study was conducted in 31 provinces, cities, and autonomous regions in China (except Hong Kong, Macao, and Taiwan) from 2000 to 2018. e data were obtained from the statistical almanac of local government network, national environmental statistics bulletin, statistical yearbook of provinces and cities, China statistical yearbook on enviroment [27], China's environmental yearbook [28], law yearbook of China [29], and procuratorial yearbook of China [30].

Evaluation Method.
Based on the current research on the evaluation systems of ecological civilization construction [12,13], this study adopted the improved entropy TOPSIS method [31,32] to carry out subjective weighting [33] and objective weighting and used the ecological index (I) and subsystem indices (S, E, G, C, H).

Pentagon
Model. In the pentagon model, the sum of the distances from any point to the vertices is a fixed value, which can directly and concisely reflect the relationship between different elements and the degree of coordination and deviation of a single element index. As shown in Figure 1, the pentagon is a regular pentagon. e five sides represent the indicators of social development, green environment, economic growth, cultural heritage, and institutional systems. e dimensionless results of spatial elements (Si, Ei, Gi, Ci, and Hi) represent the vertical distances to the five sides of society, environment, economy, culture, and institutional system, respectively, and satisfy the condition Si + Ei + Gi + Ci + Hi � 1 to determine its coordinates (points of ecological civilization). e vertices of this regular pentagon are connected to the vertices of five different regions. Among those regions, I is the advantage type of social development, II is the advantage type of green environment, III is the advantage type of economic growth, IV is the advantage type of cultural heritage, and V is the advantage type of the institutional system. e coordination and deviation degrees can be further defined by evaluating the type of spatial unit.

Panel reshold Regression Model.
Using the panel regression model to evaluate the influence of each index on the construction of ecological civilization, this study adopts the threshold regression model proposed by Hansen. Taking social development, green environment, economic growth, cultural heritage, and institutional system as the threshold variables, this study further analyzes their nonlinear relationship with the construction of ecological civilization (the relationship between variables varies significantly) [34].
Panel Regression Model. In this study, the panel regression model was used as the basic model. e model assumptions are as follows: where Q i,t is the ecological index, X 1 , X 2 , . . ., X n are the control variables, S i,t is the social development, E i,t is the green environment, G i,t is the economic growth, C i,t is the cultural heritage, H i,t is the institutional system, ε i,t is the corresponding coefficient vector, i refers to the province, and t is the year.
reshold Regression Model. In this study, social development, green environment, economic growth, cultural heritage, and institutional system are assumed to have an impact on the construction of ecological civilization. ese are not simple linear relationships, assuming that there is a threshold value. e ecological index (Q) is defined as the explanatory variable; social development (S), green environment (E), economic growth (G), cultural heritage (C), and institutional system (H) are defined as the threshold variables; and the control variables are composed of X 1 , X 2 ,. . ., X n . e specific model assumptions are shown in the following equation: Q it � μ i + α 1 X 1i,t + α 2 X 2i,t + · · · · · · + α n X ni,t where μ i represents unobservable factors reflecting the construction of ecological civilization, I(·) is the index function, c 1 , c 2 , . . ., c n are the threshold values to be estimated, S can be replaced by E, G, C, and H, and the other variables are equivalent to equation (1).

Analysis of Space-Time Characteristics and Regional
Coordination During this period, the average annual growth rate was 9.22% and the overall development pattern was environment >society >economy >institution >culture.
ese results suggest that society, economy, system, and culture are important components in the development of ecological civilization, and the environment is the decisive factor is termed the growth stage, when the ecological index growth rate was high (13.28%), indicating the development pattern of environment >economy >society >institution >culture. However, it fluctuated greatly in this stage as the concept of ecological civilization had not yet been put forward in the "tenth fiveyear plan." Although the annual per capita GDP growth rate was 13.88%, focus was limited to the rapid development of the economy, ignoring environmental pollution, energy consumption, and the unstable situation of system development. In 2004, compared with the previous year, the crime rate and the amount of corruption increased by 1%, and the system index decreased, causing the ecological index to reach its lowest point. e second stage (2007-2012) represents the transitional stage, in which China's economic development was growing at a high speed and the GDP per capita was growing at an annual rate of 13.88%. However, this extensive economic growth caused heavy environmental pollution and resource wastage, and the growth rate of the ecological index decreased by 10.5%. e development pattern changed from that during the first stage to environment >society >economy >institution >culture. During this stage, the 17 th e population density refers to the ratio of the regional population to the land area. 2 e proportion of the working-age population refers to the ratio of the number of people aged 15-64 to the total population. 3 e proportion of the ecological area refers to the ratio of the local natural environment protection area to the total area under jurisdiction. 4 Complexity National Congress of CPC formulated an industrial structure, economic growth pattern, and consumption pattern to save resources and energy and protect the ecological environment. is stage also coincided with the 2008 global financial crisis, which affected economic development by slowing the growth rate slightly.
is period was also characterized by accelerated social development that improved people's livelihood and ensured the development of various social parameters such as education, medical care, and social security.

Analysis of the Construction of Ecological Civilization in China.
During the study period, to investigate the spacetime law of China's ecological civilization construction, social development, green environment, economic growth, cultural heritage, and the institutional system components were analyzed ( Figure 4).
(1) Social development is mainly reflected in the level of regional urbanization, people's living standards, and infrastructure construction. During the study period, the developed areas as a whole were located in the eastern coastal areas, while the less developed areas showed a T-shaped distribution. In 2000, the level of social development in China was relatively low and the development patterns were scattered. With continuous economic growth, the social development patterns gradually stabilized and the social development index rose from 12.57 to 14.55. e Beijing-Tianjin-Hebei, Jiangsu-Zhejiang, and other socially developed areas offer a good quality of life for their residents and excellent public service facilities. e urbanization rate of Beijing reached 86.5%, while most of the western regions were backward areas in terms of social development, with small population density and relatively backward infrastructure. Only Xinjiang developed from a general area to a less developed area during the study period, but the social development of this area was still deficient, and the proportion of the working population increased by only 2.16% from 2000 to 2018, to some extent, restricting the population growth and affecting the development of society. Most of the central regions of China were less developed areas, which had more obvious  changes. e urban unemployment rate decreased from 3.7% in 2008 to 3.1% in 2018. (2) e green environment reflects the air and water quality, pollution control, and ecological environment. e results showed that the index of environmental quality was the best during the study period, and the index increased from 15.26 to 17.13 with a decreasing spatial differentiation from west to east. In terms of the green environment, the western and southern regions of China are developed, and the regions of Beijing, Tianjin, and Hebei are backward areas. Guizhou, Chongqing, and Gansu have responded positively to state policies by revising the local laws on the protection of the ecological environment. After the state implemented actions such as greening the land, protecting the ecological red line, and controlling smog, the environmental value in these provinces increased to the median level. e environmental quality of backward areas also improved, e.g., the proportion of good air days in Beijing increased from 48% in 2013 to 65.8% in 2018, indicating that air quality in the environmentally backward areas in China improved. (3) Economic growth refers to a region's economic development degree, the proportion of industries, investment in science and technology funds, and economic consumption. e results show that China's economic growth index increased from 13.06 to 14.45, showing a gradually declining trend from southeast to northwest. In 2000, China's overall economic level was relatively low and only Guangdong was a developed region. As a result of the countermeasures put forward in the "eleventh five-year plan" to "maintain stable and relatively fast economic development and speed up the transformation of the mode of economic growth," China's economic development speed has increased. In particular, in 2008, the number of developed regions rose to four, and by 2018, it had reached six, among which the Beijing-Tianjin-Hebei and southeast coastal areas were economically developed regions, and the Northwest Frontier areas such as Xinjiang and Tibet were financially backward regions. Economic growth in the central region was evident, with a GDP growth rate of 8.8% in 2018, which has shifted from a general area of economic development to a less developed level. In the early stage of reform, China vigorously developed the economy of the eastern coastal areas; however, with an increased number of policies being implemented, the center of economic development gradually shifted to the central region, forming a dual-core development model in the eastcentral region.
(4) e cultural heritage reflects people's cultural level and the inheritance of traditional culture in the region. e index of cultural heritage increased from 9.75 to 11.52, accounting for the lowest proportion in the total index. Xinjiang, Jiangsu, Shanxi, and Beijing had high national cultural heritage index values, mostly owing to the intangible cultural heritage, such as Dingxiang County dough figurines and folk tales. Guizhou, Guangxi, Qinghai, and other places scored lower on the cultural index. (5) e institutional system is an important prerequisite for development, which reflects the number of local laws and regulations, the degree of public participation, and the stability of the region. e institutional system index increased from 11.91 to 13.22, which shows the trend east >middle >west. During the study period, the northeastern and eastern regions of China were the developed areas and Guizhou, Henan, and Hubei were the backward areas. As the regional government lagged behind the implementation of the policy, the development of 6 Complexity ecological civilization construction in the provinces and cities also lagged behind. Hence, the development of the system in China needs to be further improved.

Analysis of the Coordination Degree of Regional Ecological Civilization Construction in China.
Further analysis of the regional coordination degree of the ecological civilization construction ( Figure 5) shows that the regional  Complexity developments of provinces and cities are not coordinated; however, there is a noticeable shrinking trend toward the center of gravity of the pentagon. e regions with poor regional coordination are the western and northeastern regions, among which the western regions, such as Qinghai and Tibet, have the highest degree of coordination and deviation from the other regions. e environmental quality and cultural level of these regions are highly developed; however, the society, economy, and institution components are relatively underdeveloped. Since the issuing of a catalog by the state council to encourage industrial development in the western regions in 2014, the development strategies for the western regions have been implemented, and the society and economy components have been strengthened. However, a small population base is still a constraint to development, especially in Tibet, where the population development density is less than 2% of the national average. In the northeast areas, Heilongjiang and Jilin have well-developed institutions, but their economic development is backward, their GDP still maintains a middle to low ranking relative to the rest of the country, and the development between the systems shows an extremely uncoordinated trend. e eastern coastal areas have the highest levels of regional coordination, followed by the central region and the southeastern coastal areas of China, which are rich in resources and have convenient transportation facilities, vast markets, and efficient policies. e levels of social, economic, institutional, and cultural development in the southeastern coastal areas are higher than the national average, and the ecological environment has improved significantly in these areas. In particular, Guangdong and Jiangsu, which gained much focus in 2018, had GDPs that ranked first and second in China. Simultaneously, their ecological environment improved, and, with a more sound system, the two places have achieved a higher degree of coordination. With the increase in time, the trend of economic development has expanded inland from the southeast coast. In 2018, 50% of the provinces in the central region entered the top 10 ranks in the GDP rankings. e increased economic growth rate implies the development of society, culture, and institutions, balancing the development pattern of ecological civilization construction.
In 2000, the points of the ecological index were unevenly distributed among the five components and were dominated by the environment, society, and economy. In 2008, the degree of coordination in the region increased and the points of the provinces and cities shrank and shifted to the center of gravity. Compared with 2008, the deviation degree of each province and city in 2018 decreased slightly, and the coordination was better. Although some provinces and cities gathered in the center of gravity, most provinces and cities still deviated from the environment-society, which may be due to the increasingly fierce trade friction between China and the United States in 2018. China's high-end manufacturing development and economic growth have been affected to a certain extent, resulting in a slightly lower economic index than in previous years. Moreover, with the promulgation of the "Environmental Protection Tax Law" and the new version of the "Law on the prevention and control of Water Pollution," the protection of the environment and water resources was strengthened.
erefore, most of the ecological civilization points were concentrated within the regions of environment and society.
In 2000-2018, the province that exhibited less fluctuation was Ningxia. Ningxia is highly uncoordinated and has a high degree of deviation, and only the green environment in this area has developed well. Ningxia experiences a long-term drought and has a harsh ecological environment. In 2018, the total output value of Ningxia was 165.026 billion yuan, 4% of that of Jiangsu Province. e economic level was relatively low, the social conditions were backward, and the development level of per capita medical treatment level was average. 8 Complexity environmental problems, and it was only after optimizing the industrial structure and increasing the proportion of scientific and technological input that the environmental quality improved and the city moved toward the green environment.

Panel Data Regression Results.
In this study, we tested the panel data from 2000 to 2018 in China. All the variables passed the 5% significance level test; thus, the original hypothesis of the existence of the unit root was strongly rejected, i.e., the original sequence is stable. On this basis, panel data models were built using all the indicators of China's ecological civilization and the results of the 1% significance test. e results in Table 2 show that the F statistic is significant.
us, the fixed-effect models without heteroscedasticity and mixed ordinary least squares (OLS) models were excluded. e Hausman test was used to confirm that the p value is less than 0.1 and the random effects model was used.
Population density (PD) and cultural heritage did not pass the significance test, except for the green environment. Other indicators were positive, as the rapid expansion of PD resulted in a sharp decline in the local carrying capacity. e shortage of resources aggravated the contradiction between environment and population, which had a negative impact. e correlation coefficients between the consumption level of residents (CLR) and all indexes were positive, and the CLR was affected by the overall economic situation to a great extent. In general, when the economy grows, the level of consumption rises, and the living standards improve, which otherwise decline. e correlation coefficient between the proportion of environmental investment (PPI) and the construction of ecological civilization was not significant. Except for the economy, the other indexes were all positive, and the environmental index was the most influential. e reason for this is that ecological protection investment is one of the crucial measures of the state to control the ecological environment, it plays an important role in environmental governance, and it reflects the level of social and economic development.
e correlation coefficient between air quality (AQ) and all indicators was positive. AQ had a more significant impact on the development of ecological civilization. Haze pollution significantly impacts the air quality in China; smog accelerates the deterioration of the environment, causes visual impairment, hinders the normal operation of the transportation industry, and affects social and economic activities.
Technology input (IST) was not significantly correlated with cultural heritage; however, it was positively and significantly related to the other indices. Government-led investments in the science and technology sector can improve the production efficiency, enhance the utilization of resources, and promote the development of a green economy while reducing the emissions of environmental pollutants.
Energy consumption (EC) had a tremendous and negative influence on the development of China's ecological civilization construction. Although China is rich in energy resources, the per capita ownership is low, and the spatial distribution is unbalanced. At the same time, the excessive consumption of energy will aggravate the problems of resource shortage and environmental pollution, leading to economic decline and social development stagnation.
World nonheritage quantity (WCQ) was positively and significantly correlated with all the indicators. e World Intangible Cultural Heritage is a manifestation of China's long cultural heritage, which has a varying degree of impact on all aspects of China's development. By the end of 2018, China had 40 world intangible cultural heritages, ranking first in the world. e relationship between educational attainment (EL) and the construction of ecological civilization was not significant. Except for the green environment, the other indicators showed significant positive correlations; this may be because education is essential for social development in China, and the increase of high-quality technical talents can provide an impetus for the development of China's economy. However, the rapid growth of the economy and society may destroy China's energy structure, increase the emission of pollutants, and have a particularly negative impact on the environment.
Environmental Regulation (ER) was negatively related to economic growth only, and the other indicators were positively and significantly related. rough the introduction of rational ecological planning, we can improve the quality of the environment, reduce the waste of resources, and promote a better-coordinated development of our society and environment. However, the economic structure of provinces and cities that depend on energy resources will be impacted after the promulgation of the Environmental Regulations for Sustainable Development, affecting local economic development.
e government information disclosure state (GCS) was significantly related to all indicators at the 1%, 5%, and 10% level and only negatively associated with economic growth, which may be because the information issued by the government restricted economic development to a certain extent.

Empirical Study on reshold Effect and Analysis of
Results. We used S, E, G, C, and H as threshold variables to test their stage effects on the construction of ecological civilization. Using the threshold model requires two verification steps. e first step is the threshold existence test, which determines whether the threshold effect is significant. F statistics, p values, and the critical values of 1%, 5%, and 10% were obtained by bootstrapping 500 times. e existence test of the model threshold shows the threshold effects on ecological civilization construction under the respective functions of social development, green environment, economic growth, cultural heritage, and institutional system. All variables were significant. e second step is to understand whether the estimated threshold is equal to the true value. e threshold estimate and the corresponding confidence interval are shown in Table 3.
e results of the threshold regression are shown in Table 4. Combined with the threshold values presented in Table 3, it can be inferred that the ecological civilization construction shows a nonlinear relationship with social development, green environment, economic growth, cultural heritage, and institutional system.
(1) Results show that at the confidence levels of 1%, 5%, and 10%, social development was significantly related to the construction of ecological civilization. e highest level of ecological civilization construction was achieved when the Social Development Index went below 0.81. When the level of social development was between 0.281 and 0.471, the impact on ecological civilization was still positive, but it was weaker than the previous stage. When the level of social development was between 0.471 and 0.531, the influence on the construction of ecological   civilization was still weakening, and when the level of social development was more than 0.531, its promoting effect on the structure of ecological civilization began to strengthen. At the initial stage of social development, there were shortages in medical care, electricity consumption, and public infrastructure construction in China, the construction of social development was accelerated and the structure of medical facilities and public infrastructure was improved. As a result, the urban unemployment rate decreased, residents' living and consumption ability improved, and social development gradually stabilized. e growth rate decreased slightly; however, the growth rate of the social development level was raised again under the influence of the continuous improvement of China's ecological civilization construction. (2) e green environment had the most significant influence on the construction of ecological civilization, which was influenced by the confidence levels of 1% and 5%. When the green environment passed through the three inflection points of 0.242, 0.342, and 0.516, it promoted the construction of ecological civilization. As it embodies the ecological environment such as atmosphere, water, and land, the green environment also restricts the development of the economy and society. In the initial stage of construction and development, environmental resources played an increasing role in promoting ecological civilization; however, the continuous consumption of energy caused severe damage to resources and the environment, exacerbated environmental problems in China, and led to a gradual decline in the role of environment in promoting the construction of ecological civilization. erefore, awareness on protecting the environment has been raised. e treatment rate of urban sewage and garbage increased year by year, but because of the difficulty of pollution control, a long treatment period, and high cost, a decline remained in the growth rate of the environmental index.
(3) e influence of economic growth on the construction of ecological civilization was significant at the 10% level and showed a U-shaped nonlinear relationship. When the economic growth was less than 0.271, the construction of ecological civilization was restrained. When the economic growth was more than 0.271 and less than 0.324, the inhibitory effect was weakened. When the economic growth was more than 0.324, the inhibitory effect gradually changed into a promotive effect, and when it passed the inflection point of 0.423, the stimulative effect increased gradually. In the early stages of economic development, there was a sole focus on economic growth with high efficiency and a disregard for the damage caused to the environment, which led to the inhibition of the construction of ecological civilization and slowed down the speed of economic growth. After state intervention and regulation, investment in science and technology increased.   0.224 * * * 0.245 * * * 0.261 * * * 0.175 * * * 0.211 * * * F value 9.960 * * * 18.110 * * * 9.460 * * * 11.250 * * * 11.74 * * * R 2 0.328 * * * 0.245 * * * 0.301 * * * 0.374 * * * 0.334 * * * point of 0.497 through 0.346 and 0.452, the positive promoting effect increased initially and then decreased. From the above analysis, it can be seen that the system played a specific role in promoting and regulating the construction of ecological civilization in time and space and controlled the development of the structure of ecological civilization through legislation, the release of government policies, and public participation to avoid the system loss. However, because of the lag in the local government policy, the construction of the system had little effect on the development of ecological civilization.

Discussion of the Results.
is paper studies the law of space-time differentiation, the characteristics of regional coordination, and the influence mechanism of the construction of ecological civilization in China. It is found that the eastern part of China has the best level of ecological civilization construction, among which the economic index is the highest. As the coastal area of China, the eastern part has convenient transportation, a strong resource base, and frequent international trade. Some of the indicators were outstanding, for example, the urbanization rate was high.
e local legislation and government information disclosure system were relatively sound; thus, a large number of talents flowed to the eastern region, which led to the development of the local society and economy. In addition, with more institutions of higher learning, residents have a higher level of education. However, due to its developed industry and large energy consumption per unit GDP, the environmental index was the lowest, the air quality was poor, and the environmental problems were serious. e development of ecological civilization in the central and northeast regions of China was relatively general, and the development of the central region had changed considerably. e early economic development of the central region benefited from the inheritance of industrial transfer in the eastern region, and its development model was limited. Subsequently, national government policies were introduced one after another to increase economic mobility, and the growth rate of per capita GDP was prominent. Gradually, a "two-engine" model of economic development in the eastern and central regions was formed. e urban unemployment rate dropped, and social development gradually stabilized, thus improving ecological civilization construction in the central region.
As an old industrial base, the northeast region was rich in mineral and oil resources, and its industrial structure was dominated by the secondary industry, which belonged to the resource-based economy. However, uneven development and utilization led to the low comprehensive utilization rate of industrial solid waste and the low treatment rate of garbage, leading to resource depletion, environmental pollution, economic decline, brain drain, and other problems and therefore resulted in a modest level of ecological civilization. e western region was the region with the worst outcome of China's ecological civilization construction. It is located in the interior and has a complicated climate environment, a large ecological protection area, and the best air quality. erefore, the environmental index was the highest. It has a unique regional western culture. e number of cultural scenic spots is relatively large, but the consumption level of the residents is relatively low, and the construction of social infrastructure is relatively weak. As economic policies such as the "West-East natural gas transmission project" and the "West-East electricity transmission project" have been implemented, the rate of economic growth has increased substantially; however, its base is weak and is still different from other regions, resulting in a poor ecological civilization construction level.

Research Innovation.
After consulting extensive literature, this paper found that the indicators of ecological civilization construction mainly focused on land space, environment, resources, economy, society, and system. With the development of the economy, the measurement of ecological civilization was not only limited to the existing research but also formed a complex multisystem. erefore, this paper reintegrates the system of land space, resources, and environment. At the system level, the legal index is added, and according to the overall development status, the cultural system is added to the original system with cultural and intangible heritage, education level and other indicators were added to fill it. Finally, the construction of ecological civilization was divided into five levels: society, economy, environment, culture, and system.
In terms of research methods, there have been few methods to measure regional coordination and intraregional system coordination. erefore, this paper started with the triangles model principles and moved to the pentagon model along the research process. e pentagon model not only determines the coordination degree of the regional ecological civilization construction in China but also directly reflects the coordination degree and deviation degree of each subsystem of the local ecological civilization. At the same time, to better promote the development of ecological civilization construction in China, after exploring the law of space-time evolution, this paper analyzed the influencing factors of ecological civilization construction with the help of the panel threshold model to deepen the significance of the article and widen the scope of the study.

Research Limitation.
is study aims to improve and to optimize the relationship between human beings and nature. In essence, this research attempts to conform to a new pattern of economic development under the new normal, to meet people's new expectations for a better life, and to provide a new path for the sustainable development of all countries. However, when evaluating the construction of ecological civilization, attention should not only be paid to the macroscale and medium-scale but also to the microscale, such as "the construction of civilized ecological villages" and "the construction of ecological civilized communities." Additionally, the lag issues in the system implementation have been overlooked in this research. ese problems will affect the evaluation results of the structure of ecological civilization in different degrees, which will need to be taken into account to eliminate errors in the future. Also, though this paper evaluates the space-time distribution characteristics and influencing factors of ecological civilization construction, the system coordination and future development forecast of ecological civilization construction need to be further studied.

Conclusion
In this study, the spatiotemporal distribution of ecological civilization construction in 31 provinces, cities, and autonomous regions in China from 2000 to 2018 and its natural and social influencing factors were analyzed using the pentagon model and panel threshold model. e following conclusions were drawn: (1) During the study period, China's ecological civilization construction as a whole increased from 12.07 in 2000 to 14.17 in 2018. e spatial differentiation pattern changed from environment >society >economy >system >culture to environment >society >economy >system >culture in western China. (2) e regional coordination degree was the highest in the eastern regions, followed by central, northeastern, and western regions. e intraprovincial coordination degree was unevenly distributed among five components in 2000-2008 and shifted toward the environment, economy, and society components. In 2018, the degrees of deviation in the regions decreased, the coordination among them strengthened, and they concentrated in the two categories of environment and society. (3) Population density, consumption ability, environmental investment, air quality, technology input, energy consumption, world nonheritage quantity, educational level, environmental regulations, and government information disclosure have significant impacts on ecological civilization construction, social development, green environment, economic growth, cultural heritage, and institutional systems. Technology input had the largest influence followed by energy consumption. e influence of government information disclosure was the least.

Data Availability
Data are available on request.

Conflicts of Interest
ere are no conflicts of interest to declare.