Emergy analysis of regional water ecological-economic system.
Emergy analysis of regional water ecological-economic system.
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DOI：
10.1016/j.ecoleng.2008.11.003
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发表时间：
2009-05
影响因子：
3.8
通讯作者：
C. Lv;Zening Wu
中科院分区：
文献类型：
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作者：
C. Lv;Zening Wu
本文提出了基于能值综合的水生态经济系统（WEES）评估的理论框架和方法。通过计算复杂系统内外的生态经济投入和产出，基于一系列能值指标讨论系统的经济状况、水资源开发和系统可持续性。除传统指标外，遵循系统评价原则，制定了水能值比（WER）、水能值利用率（WEUR）、水能值自养比（WESR）、水能值密度（WED）4个指标，定量评价水资源开发状况。以郑州水生态经济系统为研究区，通过郑州与国内选取城市的系统指标比较，识别我国郑州水生态经济系统的总体状况。研究结果还显示，北京的大部分指标在中国入选城市中处于中等水平。其中，郑州2005年以能值可持续指数（ESI）和水资源人口承载力（WPC）指标表示的可持续性分别为1.34和194万，表明郑州WEES水资源压力较大，处于较低的可持续性水平。
The theoretical framework and methodology of a water ecological–economic system (WEES) assessment based on emergy synthesis are proposed in this paper. Through calculating ecological and economic inputs and outputs within and outside the complex system, this paper discusses the system's economic situation, water resources development and system sustainability based on a series of emergy indicators. Besides traditional indices, following the principle of system assessment, four new indices, water emergy ratio (WER), water emergy utilization ratio (WEUR), water emergy self-support ratio (WESR), and water emergy density (WED) are formulated to assess the state of water resources development quantitatively. Taking the Zhengzhou water ecological–economic system as a study area, through the comparison of the systematic indicators of Zhengzhou with those of the selected Chinese cities, the general status of the Zhengzhou water ecological–economic system in China is identified. The results also show that most indicators of Beijing are located at middle levels among the selected Chinese cities. In particular, the sustainability, expressed by the indicators emergy-based sustainability index (ESI) and water resources population carrying capacity (WPC) were 1.34 and 1.94 million, respectively, in Zhengzhou in 2005, which indicates that the Zhengzhou WEES is in heavy pressure of water resources and is located at low levels of sustainability.