2000-2002年大悟县复合生态系统能值分析

Emergy Analysis of the Complex Ecosystem in Dawu County during 2000-2002

运用能值方法对大悟县2000-2002年的复合生态系统进行研究,探讨该系统中环境负载率、能值自给率、可持续发展指数等指标的水平及变化趋势。结果表明：2000-2002年大悟县复合生态系统的能值自给率分别为81.33%、78.79%、75.35%,说明系统对外界环境依赖性低,经济安全性高;可持续发展指数由2000年的0.54变为2002年的0.41,表明可持续发展能力有待提高;同时系统的环境负载率从2000年的10.05上升到2002年的10.55,表明生态环境所受的压力较大,应在增加经济效益的同时注意保护环境,提高生态效益。

The complex ecosystem in Dawu County during 2000-2002 was studied by using the emergy method.The level and change trend of the indices such as environmental loading ratio,Emergy self-supply ratio and the sustainable development index in the system were discussed.The results showed that the Emergy self-supply ratio in Dawu County during 2000-2002 were 81.33%,78.79%,75.35% respectively.This indicated that this system had low dependence on the external environment and high economic security.The sustainable development index reduced from 0.54（in 2000）to 0.41（in 2002）,which indicated that the sustainable development capability of the system needed to be improved.At the same time,the environmental loading ratio of this system increased from 10.05（in 2000） to 10.55（in 2002）,which indicated the ecological environment had suffered greater pressure.When the economic benefits increased,more attentions should be paid to the environmental protection in order to enhance the ecological benefits.