基于能值理论的荥经县土地系统脆弱性分析

Land System Vulnerability Analysis Based on Energy Theory:A Case Study of Yingjing County

土地系统脆弱性作为制定土地可持续发展政策的重要依据,已成为当前土地系统可持续发展研究的重要组成部分。应用能值分析方法,在对荥经县土地系统能值投入产出动态分析的基础上,对土地系统脆弱性状况进行分析,旨在为当地区域可持续发展寻求途径和对策。研究结果显示:(1)从1996—2011年,全县土地系统总能值投入从1.36E+21 sej增加到2.37E+21 sej,总能值产出从1.59E+21 sej增加到1.96E+21 sej;(2)土地能值密度、人均能值及环境负载率均呈现增长趋势;(3)能值投入产出比及可持续发展指数均有所下降。结果表明,荥经县人民生活水平虽有所提高但土地系统所承受的环境压力却越来越大,其脆弱性在逐渐增强。

Land system vulnerability is an important basis for making sustainable land system developmentpolicy, and has become an important part of sustainable land system development study. The paper aims topropose approaches and countermeasures for the sustainable land system development in Yingjing Countybased on a dynamic analysis of energy input- output. The results showed that：（1） the total energy inputincreased from 1.36E＋21 sej to 2.37E＋21 sej, and the total energy output increased from 1.59E＋21 sej to1.96E＋21 sej from 1996 to 2011;（2） the land energy density, per-capital energy and environmental loadingratio all showed an upward trend;（3） energy input-output ratio and sustainable index both had a downwardtrend. The results indicated that although people＇s living standard of Yingjing had been improved, theenvironmental pressure and land system vulnerability had become more and more serious.