Table 1 The index system for coupling coordination analysis between socio-economy and environment.
System | Code | Indicator | Unit | Effect |
|---|---|---|---|---|
Socioeconomic system | X1 | Gross domestic product (GDP) per capita | 10,000 Yuan/person | Positive |
X2 | Income per unit land area | 10,000 Yuan/km2 | Positive | |
X3 | Engel’s coefficient | – | Negative | |
X4 | Proportion of the added value of tertiary industry to GDP | % | Positive | |
X5 | Import and export value per capita | $/person | Positive | |
X6 | Population density | person/km2 | Positive | |
X7 | Urbanization rate of permanent residence | % | Positive | |
X8 | Number of hospital beds per 10 thousand people | – | Positive | |
X9 | Number of college students among 10 thousand people | person | Positive | |
Environmental system | Y1 | Industrial wastewater discharge per unit of GDP | ton/Yuan | Negative |
Y2 | Fine particulate matter (PM2.5) concentration | µg/m2 | Negative | |
Y3 | Energy consumption per unit of GDP | tce/Yuan | Negative | |
Y4 | Utilization rate of non-hazardous industrial solid waste | % | Positive | |
Y5 | Centralized treatment rate of domestic sewage | % | Positive | |
Y6 | Number of days with good air quality | —— | Positive | |
Y7 | Area of public green space per caipta | m2/person | Positive | |
Y8 | Greenery coverage in built-up areas | % | Positive | |
Y9 | Forest coverage rate | % | Positive |
