Temporal Variation of Water Environment Carrying Capacity in a Highly Urbanized Region of China
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. Construction of Evaluation Indicator System
2.3. Data Analysis
2.3.1. Standardization of Raw Data
2.3.2. Entropy Weight Method
2.3.3. Fuzzy Comprehensive Evaluation
3. Results
3.1. Weight and Descriptive Statistics of Indicators
3.2. Grading Criteria of Evaluation Indicators
3.3. Changes in WECC from 2006 to 2017
3.4. Evaluation of Indicators from 2006 to 2017
3.4.1. Social Subsystem
3.4.2. Environmental Subsystem
3.4.3. Economic Subsystem
4. Discussion
4.1. Problems Underlying Changes in WECC
4.2. Policy Suggestion
- (1)
- Strict enforcement of environmental regulations
- (2)
- Spatial arrangement of the urban population
- (3)
- Transformation of the development model
- (4)
- Optimization of the industrial structure
5. Conclusions
- (1)
- Based on the carrying capacity concept, this study constructed a hierarchical evaluation indicator system including three system layers (social, environmental and economic subsystems), and determined grading criteria to provide a reference for WECC assessment.
- (2)
- The WECC comprehensive index of Nanjing increased from 0.3045–0.5302 in 2006–2017, approaching Grade II (moderate) with a slow growth rate. The economic subsystem presented a stable and continuous growth, whereas the social and environmental subsystems were under considerable pressure.
- (3)
- Factors improving WECC include slow population growth, improved water environment protection, rapid economic growth, and reduced energy and water use intensity. Factors blocking WECC include increased population density, excessive water consumption, degraded water quality and an unsustainable economic development pattern.
- (4)
- To resolve the primary problems of WECC under urbanization, practical suggestions are proposed from the aspects of population, environmental regulation enforcement, development patterns and industrial structure.
Author Contributions
Funding
Conflicts of Interest
References
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Overall Target | System Layer | Indicator Layer | Units | Attributes |
---|---|---|---|---|
water environment carrying capacity(A) | Social subsystem (A1) | Population growth rate (u1) | % | − |
Population density (u2) | people/km2 | − | ||
Urbanization rate (u3) | % | + | ||
Domestic water use per capita (u4) | L/(day·person) | − | ||
Industrial water reuse (u5) | % | + | ||
Environmental subsystem (A2) | Water resources per capita (u6) | m3/person | + | |
Water resources utility rate(u7) | % | − | ||
Forest area as percent of land area(u8) | % | + | ||
Arable land area as percent of land area(u9) | % | + | ||
Use of fertilizers per unit of agricultural land area(u10) | 103 kg/km2 | − | ||
Use of pesticides per unit of agricultural land area(u11) | kg/km2 | − | ||
Compliance rate for water quality standards(u12) | % | + | ||
Wastewater treatment rate(u13) | % | + | ||
COD emission per unit of industrial added value(u14) | kg/104 RMB | − | ||
Wastewater discharge per unit of GDP(u15) | kg/RMB | − | ||
Economic subsystem (A3) | GDP per capita(u16) | 104 RMB/person | + | |
Industrial output per capita (u17) | 104 RMB/person | + | ||
The percentage of tertiary industry(u18) | % | + | ||
Annual energy consumption per capita(u19) | kg/person | − | ||
Energy consumption per unit of GDP(u20) | kg/104 RMB | − | ||
Water consumption per unit of GDP(u21) | m3/104 RMB | − | ||
Water consumption per unit of industrial added value(u22) | m3/104 RMB | − | ||
Generation of industrial solid waste(u23) | 107 kg | − |
u1 | u2 | u3 | u4 | u5 | u6 | u7 | u8 | u9 | u10 | u11 | u12 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Maximum | 3.10 | 1259 | 82.1 | 361 | 88.1 | 834 | 153 | 31.0 | 37.0 | 55.2 | 1502 | 77.8 |
Minimum | 0.29 | 1092 | 76.4 | 266 | 64.8 | 290 | 127 | 22.0 | 35.7 | 30.0 | 675 | 56.2 |
Average | 1.47 | 1203 | 79.4 | 308 | 81.5 | 430 | 142 | 27.0 | 36.3 | 37.7 | 961 | 67.8 |
Weight | 0.0436 | 0.0763 | 0.0534 | 0.0283 | 0.0266 | 0.0731 | 0.0622 | 0.0351 | 0.0412 | 0.0225 | 0.0216 | 0.0652 |
u13 | u14 | u15 | u16 | u17 | u18 | u19 | u20 | u21 | u22 | u23 | ||
Maximum | 96.3 | 2.40 | 2.40 | 14.11 | 4.64 | 59.7 | 4750 | 1.310 | 162.2 | 143.1 | 2068 | |
Minimum | 83.2 | 0.14 | 0.85 | 3.93 | 1.64 | 47.9 | 3849 | 0.590 | 36.5 | 30.4 | 1278 | |
Average | 91.4 | 1.04 | 1.48 | 8.44 | 3.10 | 53.5 | 4253 | 0.874 | 79.7 | 66.4 | 1634 | |
Weight | 0.0518 | 0.0247 | 0.0376 | 0.0555 | 0.0504 | 0.0526 | 0.0309 | 0.0463 | 0.0481 | 0.0325 | 0.0206 |
Indicator | Excellent | Moderate | Poor | Attributes |
---|---|---|---|---|
Population growth rate | 0.3 | 0.9 | 1.5 | − |
Population density | 400 | 500 | 600 | − |
Urbanization rate | 75 | 65 | 55 | + |
Domestic water use per capita | 150 | 225 | 300 | − |
Industrial water reuse | 85 | 70 | 55 | + |
Water resources per capita | 1700 | 1100 | 500 | + |
Water resources utility rate | 40 | 50 | 60 | − |
Forest area as percent of land area | 30 | 22.5 | 15 | + |
Arable land area as percent of land area | 35 | 27.5 | 20 | + |
Use of fertilizers per unit of agricultural land area | 15 | 22.5 | 30 | − |
Use of pesticides per unit of agricultural land area | 300 | 500 | 700 | − |
Compliance rate for water quality standards | 80 | 70 | 60 | + |
Wastewater treatment rate | 95 | 90 | 85 | + |
COD emission per unit of industrial added value | 0.8 | 1.2 | 1.6 | − |
Wastewater discharge per unit of GDP | 1 | 1.5 | 2 | − |
GDP per capita | 8 | 6 | 4 | + |
Industrial output per capita | 6 | 4 | 2 | + |
The percentage of tertiary industry | 60 | 50 | 40 | + |
Annual energy consumption per capita | 3500 | 4000 | 4500 | − |
Energy consumption per unit of GDP | 0.5 | 0.95 | 1.4 | − |
Water consumption per unit of GDP | 30 | 50 | 70 | − |
Water consumption per unit of industrial added value | 25 | 40 | 55 | − |
Generation of industrial solid waste | 1200 | 1400 | 1600 | − |
Grade | Comprehensive Index |
---|---|
excellent (I) | 0.725 |
moderate (II) | 0.55 |
poor (III) | 0 |
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Xu, Z.; Xiao, S.; Du, C.; Deng, Q.; Yan, B.; Zeng, Z.; Liu, X. Temporal Variation of Water Environment Carrying Capacity in a Highly Urbanized Region of China. Water 2020, 12, 3362. https://doi.org/10.3390/w12123362
Xu Z, Xiao S, Du C, Deng Q, Yan B, Zeng Z, Liu X. Temporal Variation of Water Environment Carrying Capacity in a Highly Urbanized Region of China. Water. 2020; 12(12):3362. https://doi.org/10.3390/w12123362
Chicago/Turabian StyleXu, Zhiqing, Shuhu Xiao, Cong Du, Qiyu Deng, Bingfei Yan, Zhiwen Zeng, and Xueyu Liu. 2020. "Temporal Variation of Water Environment Carrying Capacity in a Highly Urbanized Region of China" Water 12, no. 12: 3362. https://doi.org/10.3390/w12123362