基于能值理论的西安市浐灞生态区生态系统可持续性分析

目的]对西安市浐灞生态区生态系统的可持续性进行分析评价,为该区生态系统的健康、可持续发展提供理论支持。方法]基于能值理论,从社会经济和生态环境两方面选取相应的指标对浐灞生态区2004,2009,2014年的3个重要发展阶段进行对比研究。结果]西安市浐灞生态区基于能值可持续指数(ESI)在2004—2009年由0.003 4下降到0.002 4,但在2014年又增加到0.005 1,研究区可持续性总体上呈现上升趋势;从能值富集的角度分析研究区的可持续性,能值富集度指标(EIE)2004,2009,2014年的结果分别是0.82,0.82和0.59,反映研究区是一个能值高度富集的区域。结论]由于西安市浐灞生态区是高度发展的消费导向型经济且存在地域面积狭小,自然资源匮乏,过度依赖外界能值等问题导致其可持续发展能力处于较低水平,但同时能值可持续指数(ESI)表明浐灞生态区可持续性在提升,浐灞生态区是一个能值高度富集的区域,浐灞生态区能值财富的持续高度富集是其能够快速发展的重要原因。

Ecosystem Sustainability of Chan-Ba Ecological District of Xi'an City Based on Emergy Theory

Objective] The ecosystem sustainability of the Chan-Ba Ecological District of Xi''an City was evaluated to provide theoretical support for the ecological system from the aspects of health and sustainable development.Methods] Based on energy theory, the author selected the corresponding indicators from two aspects of social economy and ecological environment, to compare and study the developments in three important stages of 2004, 2009 and 2014, in Chan-Ba Ecological District.Results] The ecological sustainabilities of Chan-Ba Ecological District in Xi''an City dropped from 0.003 4 to 0.002 4 from 2004 to 2009, but increased to 0.005 1 in 2014. The overall sustainability of the study area showed an increase trend. The sustainability of the study area is analyzed from the view of energy enrichment. The energy indexes of enrichment(EIE) in 2004, 2009 and 2014 were 0.82, 0.82 and 0.59, respectively. The study area was a highly enriched area.Conclusion] Because the Chan-Ba Ecological District in Xi''an City is a highly developed consumer-oriented economy with its small area, scarce natural resources and over-reliance on external energy, which lead to its low sustainable development ability. The emergy sustainability index(ESI) indicated that the sustainability of Chan-Ba Ecological District was improved. The Chan-Ba Ecological District is a highly energy-intensive area. The continued high enrichment of energy wealth of Chan-Ba Ecological District is of great importance to its rapid development.