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| Study on water environmental carrying capacity evaluation in Taihu lake Basin |
| WANG Jia-yang, ZHAI Qing-wei, GUO Qian, TAO Yun-zhu |
| College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610041, China |
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Abstract The evaluation index system with three-layer structure had been established for the evaluation of water environmental carrying capacity according to construction of DPSIRM model. The DPSIRM model mainly involved Driving Force (D: population, socio-economic development), Pressure (P: water problems and pollution emissions), State (S: water quality changes), Impact (I: natural ecology, water and soil resources), Response (R: sewage treatment and water penetration) and Management (M: green, investment). Several indexes were chosen from socio-economic, water resources, water quality status, investment management and other aspects. And the variation coefficient method was used to determine the weight of each index in order to calculate the evaluation index of water environment carrying capacity in Taihu Lake Basin from 2005 to 2014 for assessing the effect of social economy on water environment. The results indicated that the economic and environmental carrying capacity of Taihu Lake Basin exhibited a significant improvement from Grade III in 2005 to Grade II in 2014. The Pressure indicator plays the most significant role, followed by State, Drive force, Impact and Response in sequence. The Management indicator has the weakest impact in the six subsystems. During the decade, the Driving force indicator exhibits a clear upward trend; the Impact and Management indicators were in undulation; other indicators such as the Pressure, State and Response increased year by year. The results suggest that the carrying capacity of Taihu Lake Basin on industrial and agricultural economic development is enhanced from 2005 to 2014. Among all evaluation indexes, both water consumption per million yuan GDP and wastewater discharge per unit of industrial output could be attributed to the pressure indicator, indicating that the pressure indicator exhibited a comprehensive impact on water environment evaluation. The DPSIRM model was therefore proved to be practical and feasible for evaluating the water environment carrying capacity of Taihu Lake Basin, and also provided the basis for making the scientific strategic decision on the planning and integrated management of regional water environment.
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Received: 10 October 2016
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