摘要
利用能值方法,从东南—西北方向选取吉林西部长岭、乾安、大安、镇赉四县市进行不同资源环境梯度下生态经济系统演变的对比分析。结果表明1989—2001年研究区多项能值指标差异明显:①系统稳定性方面,降水相对较多的长岭和乾安稳定性强于镇赉和大安。能值密度及能值投入率为长岭>乾安>大安>镇赉。能值产出以及能值积累量呈增大趋势,增幅长岭>乾安>大安>镇赉;②系统产出结构变化显著,虽然种植业比例有所下降,但一直是长岭、乾安的主导产业,镇赉、大安畜牧业超过种植业成为主导产业,系统平均能值产出率为长岭(1.89)<乾安(1.96)<大安(1.99)<镇赉(2.29);③环境负载率长岭<乾安<大安<镇赉,可持续发展指数则相反;④资源环境条件尤其是降水是该区生态经济系统状态的重要影响因素。
On the basis of emergy method,this paper chose four regions in west Jilin province,Changling, Qian＇an,Da＇ an and Zhenlai from southeast to northwest,to make a contrasting analysis of the eco-economical dynamics according to resource and environment gradient.The results indicated that the emergy indices were varying noticeably between the study sites.1）Stability of the systems.Agro-ecosystem functions here fluctuated obviously with rainfall,but Changling and Qian＇an had a relatively more stable agriculture than that in Zhenlai and Da＇an.Benefited from the stability,there was an increasing trend of emergy density （ED）and emergy investment ratio （EIR）from Zhenlai to Changling.Correspondingly,from 1989 to 2001 Changli largest scale-up of emergy harvest and emergy accumulation of all,followed by ng enabled the Qian＇ an,Da＇ an and Zhenlai.2）Emergy yield structures.Though experienced a declining proportion,crop still contributed most to the total emergy harvest in Changling and Qian＇an.As to Zhenlai and Da＇an, stockbreeding have played a dominating role in recent years since the crop yield suffered heavy consequences of rainfall scarcity.As a whole,the average emergy yield ratio （EYR）appeared to be Changling （1.89） 〈Qian＇an （1.96） 〈Da＇ an （1.99） 〈Zhenlai （2.29）with an implication that the higher the stockbreeding proportion was,the higher return of per emergy input among the four.3） Environmental pressure and sustainability.There was a rising trend of exploitation load which exerted on the eco-economic system of west Jilin province and the sustainable potential declined with fluctuation.In spatial scale,environmental load ratio （ELR）came out to be Changling〉Qian＇an〉 Da＇an〉Zhenlai while environmental sustainability index （ESI）varied oppositely.It was higher economic stress that led weak sustainability of the agro-ecosystems in Changling and Qian＇an, but Da＇afi and Zhenlai had a lower level and more unstable economy mainly for the reason of
出处
《自然资源学报》
CSCD
北大核心
2007年第4期507-515,共9页
Journal of Natural Resources
基金
国家重点基础研究计划资助项目(2004CB418507)
关键词
农牧交错带
生态经济系统
能值分析
波动
吉林西部
ecotone between agriculture and animal husbandry
eco-economic system
emergy analysis
fluctuation
west Jilin province
