Evolutionary Assessment of the Ecological Governance under the Metropolitan Background: Evidence from Chongming Eco-Island, Shanghai, China

Just as its general theoretical foundation does, the quantitative evaluation of ecological governance does not have a sound research compilation. This study aims to construct the ecological governance evaluation model and determine the indicator weights, premised on quantitative methods. The evaluation model is expected to embody the new features of the contemporary ecological governance, especially the metropolitan background and regional functions. Given the previous studies and conceptualizations, it is proposed based on (1) fundamental socio-economic development, (2) ecological environment quality, (3) ecological governance and innovation, and (4) regional interconnected functions. The model covers multiple index layers and various indicators, and the entropy weight method is applied to obtain the weights. The results of the specific case in Chongming show the indicator of the number of beds for old-age nursing homes in urban and rural areas, the area of real afforestation, the number of approvals in the project environmental assessment and the freight volume have the biggest weights in each of the four aspects respectively. The level of ecological governance in Chongming Island has been continuously improving, especially in 2015 and 2016, with increases doubling or tripling those of the previous two years. The index values of the four aspects generally showed an upward trend. The comprehensive social economic level and the regional interconnected level continue to grow. The levels of ecological environment quality and the ecological governance and innovation fluctuated in 2013 and 2014, but returned to growth in 2015, and increased significantly in 2016.


Introduction
The industrial and technological revolutions have brought great changes in social and economic activities. People have become more capable of knowing, communicating with, and even manipulating nature. However, this is often by way of sacrificing agreeable ecological and environmental conditions. This, in turn, has prompted people to think and deal with these problems by means of ecological governance. The contemporary ecological governance advance is unfolded against the background of metropolitan expansion. The changing socio-ecological conditions of a certain geo sphere are intertwined with the characteristics and trends of the metropolises in which it is located. multiple goals including those of environment, economy and society. It resembles ecological governance in covering both environmental and social-economic conditions. This is why we start from the sustainability measurement to understand the ecological governance evaluation. The sustainability measurement is an important part in academic inquiry of ecological economics. Since sustainable development has been conceptualized, indicators are developed to conduct empirical research from multiple perspectives in the three pillars of sustainability, namely environment, economy and social development [12][13][14][15][16][17]. The Human Development Index (HDI) by the United Nations Development Program (UNDP) is premised on three basic aspects of expected life span, education and living quality. Some researchers use HDI to see how sustainability functions in the ecological field [18,19]. Another noticeable category of the indicators concerns the ecological footprint. The concept of ecological footprint originated in the 1990s. Rees and Wackernagel tried to measure the relations between humans' claiming of natural resources and the earth bearing capacity [20]. Some researchers further lead us to understand how sustainability indicators will enter the policy domain and governance process [21,22]. Hezri and Dover discuss how sustainability indicators are resonant with decision-making, given a certain governance system [21]. Asserting that sustainability indicators often facilitate the policy process in an indirect and soft way, Sébastien and Bauler suggest that the receptivity of the indicator development is crucial for involving various actors and the general political contexts [22]. However, what makes the ecological governance evaluation differ from the sustainability measurement is that the latter often does not embody the actions and process taken to combat the ecological problems. More sustainability relevant indicators may vary in their research themes. For example, some researchers have proposed to consider the stakeholders' perspectives in the city branding evaluation steered to sustainable urban development [23]. A sustainable development assessment is constituted of the economic and environment indicators that are characteristic of deriving from public participation and consultation, including local academics, government officers of Shanghai and Chongming, community, farmers and workers etc., [24]. Some researchers, from the perspective of bio-economy, have set a framework focusing on the intersections of the three pillars of the sustainability, namely environment, economy and society [25], but which lacks the governance dimension in sustainable development. Some researchers have pointed out the necessity to build the sustainability assessment from regional perspectives, but have not specified the metropolitan level in the detailed indicators and applications [26]. Well-being is also a theme extended from sustainability goals and regarded as an objective of the assessment [27]. But all these could be drawn upon to contribute to the evaluation model under construction in this research.
Ecological governance is increasingly becoming an attractive research field and has undergone rapid development in recent years. Unfortunately, just as its general theoretical foundation does, the quantitative evaluation of ecological governance does not have a sound research compilation. It still requires further research efforts to reflect the characteristics of the above stated environmental, social-ecological, governance and metropolitan background. Therefore, this study aims to construct the ecological governance evaluation model and determine the index weights premised on the quantitative methods. It differs from the previous sustainability evaluations and indicators, because it is an integrated construction of an ecological governance evaluation model and particularly includes the governance dimension under the metropolitan background at a larger range. The evaluation model is expected to embody the above new features of contemporary ecological governance.
It selects Chongming Eco-island in Shanghai as the case to construct and apply the evaluation model. In China, the latest development in Chongming is closely related to metropolitan extension. Under the goal of an Eco-island, Chongming is trying to develop a green and high tech trans-industrial system, while strengthening the green land and ecological water environment in the Shanghai metropolis. Meanwhile, it is also undertaking the bigger role of linking the regional development in Yangtze River Delta, especially between Shanghai and Jiangsu province. The United Nations Environment Planning Program (UNEP) carried out an investigation on the ecological development in Chongming in July, 2014. The evaluation results revealed that the Chongming eco-development embodied the green economy concept of UNEP and served as a classical case [28]. Therefore, the constructing and application based on Chongming is of classical representative meaning in the ecological governance evaluation under the metropolitan background.
The existing evaluations on Chongming include those on ecosystem service value, eco-security, low carbon balance, wetland ecosystem health status, reduction of chemical pesticides and chemical fertilizers. Researchers made investigations of changes in land use and ecosystem services on Dongtan between 1990 and 2000, showing the total value of ecosystem services in Dongtan declining by 62% from $316.77 to 120.40 million per year between 1990 and 2000, which is largely attributable to the 71% loss of wetlands/tidal flats [29]. From the perspective of a complex system science, a compressive assessment index system and a spatial variation assessment index system for Chongming's eco-security have been established, showing that in recent years the comprehensive score of eco-security has been gradually rising [30]. Some propose an integrated methodology centered on a carbon neutral coefficient (CNC) to evaluate urban sustainability within a local urbanization process from a carbon cycle perspective. The remote-sensing based analysis shows that the change of land use and cover can greatly influence the local carbon balance and sustainable development [31]. Some researchers have conducted a comprehensive and objective assessment of wetland ecosystem health conditions, based on indicators obtained from satellite imagery and current field surveys, the results of which show that more than 75% of the total study area has been at a relatively healthy level and that the ecosystem health condition has a spatial variation relative to the distributions of elevation and land cover types [32]. Some claim that existing assessments rely too heavily on technocratic indicator systems after analyzing these studies on eco-island development, and then develop a broader planning and policy-oriented assessment matrix of their own [33].
Based on the above, most papers focus on the environmental factors. There is research paying attention to the planning and policy, but this does not quantify the governance measures in Chongming. Some researches place the studies under urbanization, but this just involves some basic indicators of land use and habitat. Even in this specific case of Chongming, few extant studies embody the quantified governance and metropolitan dimensions as being integral to ecological governance.
The remainder of the paper is organized as follows. The next section constructs the ecological governance evaluation model under the metropolitan background, including the quantitative methods and data. The third section presents the evaluation results, showing how the ecological governance status of Chongming in Shanghai has evolved in five years. The fourth section proposes the policy implications and the final section provides a conclusion and suggests possible further work.

Construct the Evaluation Index
The index framework includes 4 A-layer indexes, namely, comprehensive social and economic development, ecological environment quality, ecological governance and innovation, regional services and cooperation exchanges. It includes a total of 13 B-layer indexes and 44 C-layer indicators.
Specifically, the A-layer index of "comprehensive social and economic development" consists of three B-layer indexes, including population profile, economic development and comprehensive level of society.
The A-layer index of "ecological environment quality" consists of four B-layer indexes, including regional environmental quality, agricultural and forestry environmental quality, industrial environmental level, and human settlement environmental quality.
The A-layer index of "ecological governance and innovation" consists of three B-layer indexes, including ecological demonstration and promotion, environmental protection input management, and scientific and technological innovation.
The A-layer index of "regional services and cooperation exchanges" consists of three B-layer indexes, including population mobility, goods turnover and communication, and industrial cooperation.
The specific C-layer indicators are shown in Table 1. The above index is constructed based on the following conceptualizations and existing work.

Comprehensive Social and Economic Development (A1)
As indicated from the above, ecological governance goes far beyond the natural and habitat issues [3]. Based on the features of the adaptive governance, it provides guidelines and solutions to the practical social-ecological issues [34][35][36][37]. So, the comprehensive social and economic dimension is considered in our index. It is measured from the following aspects of population, economy and society.

1.
Population profile (B11) and its C-layer indicators. The population is the most dynamic factor in the social-ecological system. It is critical to get to know the population status prior to others. The registered population (C111) and the population density (C113) present an area's basic population situation, and the natural population growth rate (C112) indicates how it is expected to evolve in the near future. The well-being of the humans is also made prominent in the social-ecological governance in some other international cases [38]. Therefore, the average life expectancy (C114) is set in our index to embody our concern for this.

2.
Economic development (B12) and its C-layer indicators. Ecological governance under the metropolitan background is supposed to be premised on a certain high degree of economic level attainment, because it makes it possible to use sufficient sources to protect the bio-diversity and combat the environmental degradation. The value added (C121) and especially the value added aspect of the tertiary industry (C122), together are integrated to examine an area's economic capacity and its transformation to a greener level. The gross agricultural output value (C123) is also an important part in the economic output in that it is an indicator of food supply and safety. The fiscal revenues (C124), the total fixed assets investment (C125) and the per capita amount of social consuming goods retailing (C126) all represent whether a society is vibrant in its public facility support and economic mobility potential.

3.
Comprehensive level of society (B13) and its C-layer indicators. Ecological governance requires society to be involved in the governance activities to some extent. The comprehensive social development is expected to act as an important support for it. A UNEP's evaluation in 2014 on Chongming eco-civilization also regarded social life and culture in the framework as one of the most important factors [28]. In our index, the per capita disposable income of urban households (C131) and of rural households (C132) are both included to reflect the basics of the social living standards. The number of new jobs/employment (C133) is to show whether the society system has potential unstable elements. The amount of local finance invested in education (C134), the number of beds for medical and health care (C135) and the number of beds for old-age nursing homes in urban and rural areas (C136) are directly related to the livelihood and benefits of people.

Eco-Environmental Quality (A2)
If the comprehensive social and economic development is the premise condition, the well-functioning eco-environmental system is able to reflect the basic status of ecological governance under the metropolitan background. It is indispensable to the evaluations and indicators generally aimed at sustainability. It not only covers the natural elements of the atmosphere, water and noise, but also pays attention to the agricultural, forestry, industrial and habitat environment of humans.

1.
Regional environmental quality (B21) and its C-layer indicators. It focuses on the natural elements. Basic environmental factors are expected to represent the status of the ecological situation in an area, including the level of total suspended particles in the atmosphere (C211), the water quality qualification rate of drinking water sources (C212), the surface water quality qualification rate (C213) and the regional environmental noise level (C214).

2.
Agricultural and forestry environmental quality (B22) and its C-layer indicators. Agriculture and forestry constitute major parts in the ecological system. Furthermore, this kind of relatively densely populated ecologically sensitive area is closed related to the livelihood of the people living in this area. The living conditions of the people there, and how they interact with nature, may impact significantly on the ecological environment. Therefore, this aspect is of significant and practical meaning in the index. It has the area of arable land (C221) and the area of real afforestation (C222) as detailed indicators. Some researchers have studied the combined reduction of chemical pesticides and chemical fertilizers based on an ecological model, leading to ecosystem integrity and low-carbon agriculture [39]. So, the amount of fertilizer applied (C223) and the amount of pesticide applied (C224) are also considered.

3.
Industrial environmental level (B23) and its C-layer indicators. The industrial activities are one of the critical contributing factors in the environmental degradation. Preventing industrial pollution is an efficient way to relieve environmental pressure. It includes corresponding indicators such as the qualification rate of industrial wastewater discharge (C231), the removal rate of industrial fumes and dust (C232) and the comprehensive treatment rate of industrial solid waste (C233). The energy consumption of value-added (C234) is added as a green GDP indicator, showing the clean economy orientation.

4.
Human settlement environmental quality (B24) and its C-layer indicators. Caring for the human settlement environment is examined in aspects at the urban and rural environmental level. Two indicators of the investment in rural environmental protection (C241) and the investment in urban environmental infrastructure construction (C242) are taken into account.

Ecological Governance and Innovation (A3)
The concept of contemporary governance is illustrated by means of differentiating from modern government management. Both concepts are goal-oriented activities and relevant operating systems of rules, however, governance may involve diversified informal and non-governmental institutions besides government, and governance may not undertake legal or formally prescribed authority [40]. The government is argued to be still at the helm [41] while others may assert new governance without government [42]. Actually, ecological governance not only refers to the government's actions to protect the environment and bio-diversity, but also refers to mobilizing the market and social resources to cooperate with government. This inevitably requires innovations in technology and operating mechanisms.

1.
Ecological demonstration and promotion (B31) and its C-layer indicators. Ecological demonstration is normally initiated by the government and participated in by various social members and enterprises. It is usually realized through certain procedures of application, approval and even financial grants support. It is an ideal manifestation of the so-called governance. In this index of ecological governance, it is indicated with the number of state-level ecological demonstration sites (C311).

2.
Environmental protection investment management (B32) and its C-layer indicators. In ecological and environmental treatment, the government is bound to be the leading actor. The amount of resources the government inputs in this aspect directly impacts on the ecological governance level in an area. For this, we have the proportion of environmental protection input of the whole county/district in GDP (C321) and the amount of local finance invested in environmental protection (C322). The most influential measure of the government is to regulate other participants in relevant activities. For this we have the number of approvals in the project environmental assessment (C323).

3.
Scientific and technological innovation (B33) and its C-layer indicators. Ecological modernization strives to obtain the win-win position of protecting the environment while sustaining society and economic development. The theory attempts to balance economic development and environmental protections, especially in developing countries such as China [43,44]. Ecological governance relies heavily on innovation, especially the technology upgrading to carry out environmental treatment and ecological restoration. Given this trend, we take into account the number of patent applications (A331), the contract amount of technology transactions (C332) and the amount of local finance invested in science and technology (C333).

Regional Services and Cooperation Exchanges (A4)
This A-layer index also shows that the regional functioning is integral to the metropolitan background. Furthermore, the more well-connected to the surrounding environment an area is, the more possible it is to mobilize the required resources to conduct ecological governance.

1.
Population mobility (B41) and its C-layer indicators. The foremost element of regional exchanges is people flow. It refers to the two-way directions of both in and out. The corresponding indicators are the population moving in within the year (C411) and the population moving out within the year (C412).

2.
Goods turnover and communication (B42) and its C-layer indicators. The second element is the goods and information. The former is expressed with the freight volume (C421), and the latter is with the post and telecommunications revenue (C422).

3.
Industrial cooperation (B43) and its C-layer indicators. Last but not least, industrial activities are indispensable to the regional exchanges. The situation of the industrial cooperation of an area with domestic and international fields is expected to greatly improve the area's ability in introducing and applying various resources including those for ecological governance. The relevant indicators are the number of enterprises introduced (C431), the actual paid-in foreign capital (C432) and the tourism revenue (C433).

Data to Be Applied in This Case
Based on the above evaluation framework, the required data of the C-layer indicators used are collected from Chongming socio-economic statistical reports ( From 2000 to 2005, the Chongming Eco-island began to be constructed. Its development and corresponding statistical work were in the initial stages. Therefore, the data involved in relevant ecological fields are not complete enough. From 2005 to 2010, Chongming had a major adjustment of its administrative division. Changxing island and Hengsha island were then zoned in Chongming's jurisdiction. That is to say, the basic statistical range of Chongming had changed. The data consistency in these five years has therefore been broken. As a result, the data from 2012 to 2016 have been chosen to assess the ecological governance in Chongming in this specific paper. This five-year period is characteristic of various kinds of data, which are stable and consistent, especially those in ecological and environmental governance as well as the regional coordination functions. Though is it difficult to include all of the ecological endeavors from the dawn of the new century in this specific quantitative model of the paper, some information provided below is expected to help us know more about how Chongming's ecological construction has evolved in this relatively longer period. It will also act as a supplement to the quantitative evaluation frame in this research. As early as May 2001, it was explicitly designed in the Shanghai Urban Master Plan, that Chongming Island was to be built into an ecological island, and serve as an important mission in improving the overall ecological environment quality of Shanghai. The whole county formally embarked on an exploration of Eco-island construction. In 2005, the Chongming Three Islands Master Plan (Chongming County Regional Master Plan) 2005-2020 issued by the Municipal Government, clearly put forward the overall positioning of building a modern comprehensive ecological island. In January 2010, the Shanghai Municipal Government announced the newly formulated Chongming Eco-island Construction Program (2010-2020), which proposed the promotion of the coordinated development of resources, environment, industry, infrastructure and social services in accordance with the overall goal of building a world-class ecological island, under the guidance of a scientific index evaluation system, and further highlighted the position of ecological protection and environmental construction. Since Chongming put forward the goal of constructing the ecological island in the dawn of the new century, the frame of ecological environment governance in Chongming has gradually been shaped. With the joint efforts of the government, market, international organizations and institutions, as well as the public and the media, Chongming has invested much in ecological governance, and has had some ecological demonstration cases. It has begun to increasingly value environmental assessment in the project launching approval process. Ecological governance not only covers the original ecological conservation, but also promotes the scientific and technological innovation in the ecological construction by means of creating some innovation platforms, such as creator base of Changxing Marine Hi-Tech Port, the ecological agricultural science and technology innovation platform in the agricultural park, the cultural and entrepreneurial industry incubation zone in the industrial park, the creator base of Fusheng Industrial Park, and the incubator of Smart Island project.

Entropy Weight Method
Above all, given the different dimensions, all of the above C-layer indicators are to be normalized, premised on the data and assessment method as follows: where X * ij is the normalized value of the system i with the indicator j. X ijmax represents the maximum value of the system i with the indicator j. X ijmin represents the minimum value the system i with the indicator j, and X * ij ∈ [0, 1]. Then we need to determine the weights of the indicators. The entropy weight method is applied in the following steps.
Among them, p ij denotes the contributing level of system i under indicator j. If p ij equals zero, then let limp ij ln p ij = 0. E j denote the entropy value of indicator j and W j denote the entropy weight of indicator j.
From the above weight results in Table 2, we can see that in each of the four A-layer index there are some indicators with relatively bigger weights, meaning in each of the four aspects these indicators matter more in evaluating the respective level. In the comprehensive social and economic development (A1), the indicator of the number of beds for old-age nursing homes in urban and rural areas (C136) has the greatest weight, followed by the gross agricultural output value (C123). In the eco-environmental quality (A2), the area of real afforestation (C222) and the amount of pesticide applied (C224) occupies the first and second places in weights ranking. In ecological governance and innovation (A3), the number of approvals in the project environmental assessment (C323) is the most important weight, and the amount of local finance invested in environmental protection (C322) is second. In the regional services and cooperation exchanges (A4), the indicator with the greatest weight is the freight volume (C421). The population moving in within the year (C411) and the tourism revenue (C433) follow closely behind.

Evaluation Model of the Ecological Governance under Metropolitan Background
Based on the above index and weights, we construct the evaluation model of ecological governance under metropolitan background. If the model is used to evaluate an area's ecological governance situation, then the above-mentioned data will be collected to obtain the weight based on the intrinsic data information of the index construction. The scores of the various layers' index and indicators are calculated: where S k h denotes the score of the index h in B-layers with the corresponding indicator j in C-layers (actually the third layer in the index construction), X j is the normalized data value of indicator j and W j is the weight of indicator j.
Then the scores of the index in the A-layers are obtained by summing up the scores of its corresponding B-layers. Finally, we get the result of evaluating ecological governance under metropolitan background as follows: In the first layer (A-layer) there are four indexes which will be summed up to get the final evaluation results of ecological governance in our model.

Application in Chongming Case and Discussion
The     There is something noticeable, that in 2013, when the index of comprehensive socio-economic development reached its peak growth range in the five years, it coincided with the only negative growth in the ecological environment quality index. When the index of comprehensive socio-economic development maintained a moderate increase, the ecological environment quality index also had a certain degree of growth.
In addition, the reasons for the "low ebb" in the environmental quality in 2013 were partly from the influence of the regional and national environmental conditions. Due to the fluidity and spillover of basic environmental factors such as water and atmosphere, the overall level of the ecological environment was not only the result of local conditions, but might also have been affected by the surrounding areas. In 2013, there was a nationwide outbreak of fog and haze, especially in the Beijing-Tianjin-Hebei region. The Beijing area suffered serious air pollution. The smog affected 25 provinces and more than 100 large and medium-sized cities. The average number of smog days in China reached 29.9 days. In January 2013 alone, there were four large-scale smog periods in China, involving 30 provinces (regions and cities). The smog period with the longest duration, the widest impact and the strongest intensity occurred in most parts of the central and eastern regions [45]. In June 2013, China formulated ten measures to prevent and control atmospheric pollution, i.e., the "Ten Measures against Air Pollution", including reducing pollutant emissions, strictly controlling the new capacity of high-energy-consuming and high-polluting industries, and vigorously promoting cleaner production, which played an important role in the follow-up of the atmospheric pollution control nationwide, especially in the Beijing-Tianjin-Hebei region. In 2013, there was the incident of the Huangpu River "dead pigs" in Shanghai. More than ten thousand dead pigs were salvaged by the end of March 2013, causing wide concern across the country. In the same period, water pollution accidents occurred frequently in the Yangtze River Basin, for example, the water pollution in Yancheng City, Jiangsu in 2009, the water pollution in Zhenjiang City, Jiangsu in 2012, the 2013 Huangpu River dead pigs incident and the dead pigs incident in the Yangtze River tributary in Yichang City, Hubei, the Hanjiang River water pollution in Wuhan in 2014 affecting water consumption of 300,000 residents, and the abnormal water quality in Jingjiang River in Jiangsu [46]. From these examples, it can be seen that in 2013 there were frequent ecological and environmental crises in China. These environmental and sanitation incidents had a direct impact on people's daily lives and health. These urged us to think about how to change the policy, industry, lifestyle and whole development mode. According to the assessment results of our research, located in the Yangtze River Delta and acting as the link between Shanghai and central Jiangsu, Chongming's environmental quality factors, such as atmosphere and water environment were inevitably affected by the whole region, which also reflected the status of China's environment at that time.
In addition, the comprehensive socio-economic development and regional functions of Chongming experienced leap-forward development in 2013. Both the government's investment in environmental protection and the actual activities of the market itself were at a higher degree of vitality. The population moving-in also increased considerably. The indicators concerning the levels of the water, atmosphere, sound and other important environmental elements in 2013 and even in 2014 dropped sharply, and the industrial environmental level was also affected to some extent.

Comprehensive Social and Economic Development
The A-layer index of "comprehensive social and economic development" consists of three B-layer indexes, including population profile, economic development and comprehensive level of society. The changes in the five years can be seen in Figure 2. Chongming Eco-Island is an important ecological base of Shanghai with a relatively low degree of large-scale development. The centralized allocation of public services in urban centers to meet the needs of population has inevitably led to population outflow in Chongming. Meanwhile the highquality ecological environment has been preserved to the greatest extent. This is because of the optimization and adjustment of the urban system structure between the economic vitality and the supply of public services, as well as ecological environment conservation. In addition, from 2012 to 2016, the natural population growth rate of Chongming Eco-Island kept a negative growth, from  Although the index level fluctuated occasionally, the quantity and quality of these key public services still lagged far behind those of urban areas, yet it can be seen that Chongming has constantly been investing in these areas and has gained a stable effect. The county also actively enhanced the level of education and medical care through the collectivization of school operation, medical joint venture services and other ways.

Ecological Environment Quality
Under the A-layer index of "ecological environment quality", there are four B-layer indexes, namely, regional environmental quality, agricultural and forestry environmental quality, industrial environmental level and human settlement environmental quality. The changes are shown in the Figure 3. also actively enhanced the level of education and medical care through the collectivization of school operation, medical joint venture services and other ways.

Ecological Environment Quality.
Under the A-layer index of "ecological environment quality", there are four B-layer indexes, namely, regional environmental quality, agricultural and forestry environmental quality, industrial environmental level and human settlement environmental quality. The changes are shown in the Figure 3. From 2012 to 2013, the index of the regional environmental quality showed the greatest decline. It can be seen from the assessment that this was one of the important reasons for the negative growth of the A-layer index of the ecological environmental quality in 2013. The C-layer indicators under the regional environmental quality index are mainly related to such basic ecological and environmental factors as air, water and noise. The daily average of total suspended particulates representing the atmospheric quality reached its highest level in 2013, i.e., 0.14 mg/m³, which was more than twice the level in 2012, and gradually dropped to 0.09 mg/m³ by 2016. The water quality qualification rate representing the drinking water quality was at its lowest in 2013, falling from 86.5% in 2012 to 77.8% in 2013. But the indicator value gradually rose to 98.2% in 2016, suggesting a pick-up after the low point in 2013. The surface water qualification rate representing the quality of surface water also fluctuated obviously, dropping from 99.4% in 2012 to 97.2% in 2013, continuing to decline to 96.4% in 2014, but rising to 99.5% in 2015, and then falling slightly to 97.3% in 2016. The indicator value representing the regional environmental noise level during the daytime period fluctuated slightly from 2012 to 2016, but the overall noise level was rising, indicating that the sound environment quality was on a downward trend, and it declined most in 2013. The above-  First, the index of the regional environmental quality fluctuated significantly from 2012 to 2016, at 0.074, 0.014, 0.010, 0.047 and 0.043 respectively, with the highest in 2012 and the lowest in 2014. From 2012 to 2013, the index of the regional environmental quality showed the greatest decline. It can be seen from the assessment that this was one of the important reasons for the negative growth of the A-layer index of the ecological environmental quality in 2013. The C-layer indicators under the regional environmental quality index are mainly related to such basic ecological and environmental factors as air, water and noise. The daily average of total suspended particulates representing the atmospheric quality reached its highest level in 2013, i.e., 0.14 mg/m 3 , which was more than twice the level in 2012, and gradually dropped to 0.09 mg/m 3 by 2016. The water quality qualification rate representing the drinking water quality was at its lowest in 2013, falling from 86.5% in 2012 to 77.8% in 2013. But the indicator value gradually rose to 98.2% in 2016, suggesting a pick-up after the low point in 2013. The surface water qualification rate representing the quality of surface water also fluctuated obviously, dropping from 99.4% in 2012 to 97.2% in 2013, continuing to decline to 96.4% in 2014, but rising to 99.5% in 2015, and then falling slightly to 97.3% in 2016. The indicator value representing the regional environmental noise level during the daytime period fluctuated slightly from 2012 to 2016, but the overall noise level was rising, indicating that the sound environment quality was on a downward trend, and it declined most in 2013. The above-mentioned regional environmental indicators representing the basic environmental factors have all been gradually improving after the crisis in 2013.

Changes of the A-layer index on eco-environmental quality
Second, the index of agricultural and forestry environmental quality in 2012-2016 was basically in an upward state, with a slight decline from 2014 to 2015. Then the level of 0.034 in 2015 increased to 0.097 in 2016, as the year with the largest increase. Specifically, the area of arable land decreased from 506.44 km 2 in 2012 to 505.93 km 2 in 2014, and then increased to 508.62 km 2 by 2016. The area of real afforestation increased significantly from 2012-2016. In 2012, the real afforestation area was 20,871 ha. Although there were slight fluctuations between the years, it increased to 28,659 ha in 2016. This reflected that the basic conditions of forestry development in Chongming Eco-island were optimized on the one hand, and on the other hand, it shows that Chongming has invested great efforts in afforestation in the past few years. The amount of fertilizer applied and the amount of pesticide applied were basically in a state of decline from 2012 to 2016, with fertilizer application reducing by about 20% by 2016 and pesticide application by about 20% by 2016. In recent years, Chongming Eco-island has put forward the goal of "no chemical fertilizer, no chemical pesticides" in the development of eco-agriculture. It is to strictly implement the green standards of not using chemical fertilizers or pesticides in the planting process of products from rice to pear, citrus, vegetables and so on.

Ecological Governance and Innovation
In the A-layer index of ecological governance and innovation, there are three B-layer indexes, namely, ecological demonstration and promotion, environmental protection investment management, and scientific and technological innovation. The evolving trend can be seen in Figure 4 as follows.
First of all, it should be mentioned that this study primarily uses the number of state-level ecological demonstration sites to represent the level of ecological demonstration and popularization. Chongming started early in this field. In 2012, there were seven state-level demonstration areas, namely, the National Wetland Ecological Demonstration Area approved by the National Forestry and Grassland Administration, the National Ecological Demonstration Area in Chongming County approved by the  Third, the index of scientific and technological innovation continued to rise from 2012 to 2016, and the growth range was relatively even from 2012 to 2015. The index level in 2016 was 0.072 which is the highest level in these five years and more than twice the level in 2015. Of course, the level of scientific and technological innovation reflected in the relevant indicators was not entirely the result of ecology or environmental protection. However, in the period of data reflected in this study, the construction of Chongming Eco-island has been carried out for at least ten years, and the principle of ecological guidance has already been rooted in all aspects of industrial system construction and social-economic construction. Therefore, the scientific and technological innovation was centered on the ecological construction, and this study considers that it can represent the level of scientific and technological innovation in ecological governance and environmental construction. Specifically, the number of patent applications increased continuously from 45  Third, the index of scientific and technological innovation continued to rise from 2012 to 2016, and the growth range was relatively even from 2012 to 2015. The index level in 2016 was 0.072 which is the highest level in these five years and more than twice the level in 2015. Of course, the level of scientific and technological innovation reflected in the relevant indicators was not entirely the result of ecology or environmental protection. However, in the period of data reflected in this study, the construction of Chongming Eco-island has been carried out for at least ten years, and the principle of ecological guidance has already been rooted in all aspects of industrial system construction and social-economic construction. Therefore, the scientific and technological innovation was centered on the ecological construction, and this study considers that it can represent the level of scientific and technological innovation in ecological governance and environmental construction. Specifically, the number of patent applications increased continuously from 45 in 2012 to 356 in 2016, indicating that Chongming's R&D level in the fields of science, technology, knowledge or design has been continuously improving. At the same time, the awareness of property rights protection and practical action also saw improvement.

Regional Services and Cooperation Exchanges
Under the A-layer index of "regional services and cooperation exchanges", there are three B-layer indexes, namely population mobility, goods turnover and communication, and industrial cooperation. The changes can be seen in Figure 5.

Regional Services and Cooperation Exchanges.
Under the A-layer index of "regional services and cooperation exchanges", there are three Blayer indexes, namely population mobility, goods turnover and communication, and industrial cooperation. The changes can be seen in Figure 5. First, the population mobility index showed a general upward trend from 2012 to 2016, at 0.003, 0.014, 0.008, 0.022 and 0.048, respectively. Only in 2013 and 2014 was there a significant fluctuation of a sharp increase and a subsequent decline, but the overall level of population mobility in Chongming was increasing exponentially. Specifically, the population moving in within the year was 5062 in 2012, and this grew to 5502 people in 2015 after some ups and downs, and increased substantially to 8316 in 2016. In contrast the population moving out within the year was basically on the rise from 2012 to 2015, with the only one decline occurring in 2016 over the five years. One of the important reasons for this phenomenon is that Chongming was made a district instead of a county in Shanghai in 2016, and it became more closely related to the development of Shanghai's metropolitan areas and became more attractive to the population, thus significantly enhancing the "siphon" effect of the urban population. In addition, it is worth noting that the two-way flow of population maintained a relatively active state in the five years, indicating that the predicament of Chongming as an "isolated island" in history has gradually gone away. First, the population mobility index showed a general upward trend from 2012 to 2016, at 0.003, 0.014, 0.008, 0.022 and 0.048, respectively. Only in 2013 and 2014 was there a significant fluctuation of a sharp increase and a subsequent decline, but the overall level of population mobility in Chongming was increasing exponentially. Specifically, the population moving in within the year was 5062 in 2012, and this grew to 5502 people in 2015 after some ups and downs, and increased substantially to 8316 in 2016. In contrast the population moving out within the year was basically on the rise from 2012 to 2015, with the only one decline occurring in 2016 over the five years. One of the important reasons for this phenomenon is that Chongming was made a district instead of a county in Shanghai in 2016, and it became more closely related to the development of Shanghai's metropolitan areas and became more attractive to the population, thus significantly enhancing the "siphon" effect of the urban population. In addition, it is worth noting that the two-way flow of population maintained a relatively active state in the five years, indicating that the predicament of Chongming as an "isolated island" in history has gradually gone away. Third, the growth trend of the industrial cooperation index was easily seen from 2012 to 2016, and the growth range was relatively large. The level of the index in 2016 was 0.087, which was more than double of that in 2015. Specifically, the number of enterprises introduced continued to increase, growing from 5290 in 2012 to 23,221 in 2016 by more than three times the level of that in 2012. The amount of actual paid-in foreign capital in general also was on the rise, increasing from $13.73 million in 2012 to $27.86 million in 2016, at least doubling. The tourism revenue has also maintained a state of continuous improvement over the five years, with the level of 620 million yuan in 2012 increasing to 1.09 billion yuan in 2016 by 76%. Generally speaking, it reflects that the level of industrial cooperation in Chongming has maintained a good upward trend in the five years. Also, the tourism income not only reflected the development of emerging new industries in Chongming's ecological construction to a certain extent, but also embodied the degree of population and culture exchanges with the surrounding areas.

Policy Implications
Normally, the indicator theory and practice function as the information policy instrument in the policy making process. In other words, there exists a gap between the indicator producer and the indicator user. It refers to the influence of the indicators on the policy domain. Unfortunately, the paths by which the various indicators enter policy making are vague and are yet to be explored. The above are all with limiting figures for various indicators, which are constraining characteristics for the development levels. Instead the evolutionary assessment building on an integrated framework is expected to provide an evaluation model which can show more information about the changes and trends. As some researchers have asserted, the extent complex sustainability indicators might impede the policy makers using them [47]. This framework also provides a rather clear and practical set of indicators to be applied. As some researches have discussed, the indicators from the producers need some certain policy windows to let the evaluation and indicators be taken by the policy makers [21], and the index of this research is to be tested and applied in some opportunities.

Conclusions and Further Research
In the context of globalization, the process of urbanization has been accelerated. No single corner is left unaffected. Even the islands separated from the continent shall inevitably ride along the tide. In the design of the index system, the consideration of ecological environment quality should be based on a certain degree of social and economic development. In addition, while realizing the goal of ecological environment governance, it needs to be supported by comprehensive scientific and technological innovation, and should have certain cooperation and exchange functions to the surrounding areas. In this sense, the design of the index system is extensible and can be applied to other social and ecological development assessment. Based on the model, this paper assessed how ecological governance evolved from 2012 to 2016 in Chongming Eco-island of Shanghai. It serves an ideal case for examining and quantifying ecological governance in the metropolitan region. The results show a general growing and evolving trend, with complicated performances among the varying dimensions, suggesting the valuable clues of the potential relational exploring between the economy and the environment. With the improving statistical techniques and sources, the data in the longer term will be applied in further research. Further detailed comparison and linkages with the global counterparts are expected in the subsequent papers to provide more clues for this research field. Survey data and corresponding analyzing methods are also expected to contribute to the subsequent research agenda. These will provide further support for ecological governance research. Another noteworthy direction might lie in the inclusion of the renewable energy efforts in the evaluation model as the reliable quantitative data collection is possible in consecutive years. Energy use, especially renewable energy use, needs the participation and support from the whole society. If not, then the whole social and ecological system will be undergoing risks. Some researchers have also involved the renewable energy in the eco-system evaluation framework [48] or focus on renewable energy as a practical goal in the renewable energy community in terms of different residential types [49]. So ecological governance under the metropolitan background can embody this important feature in the future. In this specific case of study Chongming has carried out such efforts in renewable energy, through such initiatives as renewable energy-based energy micro-grid system, distributed solar energy power generation centering on the industrial and public buildings as well as increasing the proportion of the solar, wind and biomass energy in primary energy supply. Unfortunately, these are difficult to be quantified in the evaluation model temporarily, which constitutes a limitation of this research.
It is noteworthy that application of the model in other areas may require the detailed indicators to be adjusted if there exist data collection problems. Some relevant indicators can be used to substitute certain ones and even short surveys can be used to get some data. Of course, the weights will be different in different areas. And this properly addresses the concerns for the subjective weighting and will achieve more uniqueness in local studies. This future expected method is especially necessary when including more stakeholders' perspectives, as stated above.

Conflicts of Interest:
The authors declare no conflict of interest.