摘要
能值理论是一种定量研究生态经济系统各种能量流转换机理的定量分析方法,本文利用能值分析理论与方法,选取2000～2008年的原始数据,对长沙市农业生态经济系统的能值投入产出结构和主要能值指标进行了定量分析。结果表明,长沙市农业生态经济系统能值投入主要以不可更新的工业辅助能值为主,其所占能值比重达到0.40以上,2007年达到了0.45,从而影响了该区域内的可持续发展;能值产出以林业和畜牧业为主,种植业和渔业所占比重较低,尤其是渔业,未达到整个能值产出的0.01%;长沙市农业生态经济系统环境负载率在9年内处于1.52～3.42之间,低于全国的平均值5.89,说明长沙市农业生态经济系统环境资源未达到高效利用,提升空间较大;长沙市农业生态经济系统的可持续发展指数变化较大,处于波动上升趋势,波动范围在0.12~0.22之间,表明了长沙市农业生态经济的消费型经济系统,有待于进一步开发其潜力。
Emergy theory is a quantitative analysis method of energy flow conversion mechanism in agro-ecosystem,selected the agricultural raw data from 2000 to 2008,we analysis the input-output structure and the main emergy indexes of the agro-ecosystem in Changsha City by using the theory and method of emergy analysis.The results showed that the majority of emergy inputs was the nonrenewable purchased supplemental emergy flow,the proportion is exceed 0.40,it reached 0.45 in 2007,which affected the region＇s sustainable development;emergy output mainly included forestry and animal husbandry,the crop cultivation and fishery took the lower percentage,especially the fishery,which didn＇t reach 0.01%;the energy loading ratio is between 1.52 to 3.42 in 9 years,in the whole country,the average data is 5.89,the data of agro-ecosystem in Changsha was lower,which explained the environment resources failed to achieve efficient utilization,there was a big room for improvement;the emergy-based sustainable index of agro-ecosystem in Changsha was in ascendant trend,the range is between 0.12 to 0.22,which showed that the agro-ecosystem belongs to consumer economic system,needs to develop its potential in the agro-ecosystem.
出处
《农业现代化研究》
CSCD
北大核心
2011年第4期465-469,共5页
Research of Agricultural Modernization
基金
湖南省教育厅资助项目(编号:CX2010B298)
湖南省科技厅资助项目(编号:2009NK3102)
关键词
能值分析
农业生态系统
演替
长沙市
energy analysis
agro-ecosystem
succession
Changsha City
