摘要
采用能值理论分析方法,比较采煤沉陷区复垦前后农业生态系统能值投入和输出,结果显示,复垦后的能值总投入是复垦前的2.7倍,能值总输出是复垦前的3.1倍,能值投入率是复垦前的7.4倍,说明复垦后的农、业生态系统经济发展水平有所提高;人均能值用量是复垦前的2.7倍,表明复垦后人民的生活水平得到改善;由于复垦后农业产业结构的多元化,各产业结构正处于发展中阶段,因此,净能值产出率由复垦前的0.28降低到复垦后的0.14,但环境负荷率由复垦前的0.5上升到复垦后的3.7,系统稳定性指数由复垦前的0.10上升到复垦后的0.36,从而说明,复垦后的农业生态系统相对复垦前循环利用率和持续发展程度较高。
Emergy theory and analysis method were employed to compare the effects of pre- and post-reclamation of coal mining subsidence on emergy inputs and outputs of agricultural-ecosystem. The results showed that after reclamation, the total emergy input and output were 2.7 times and 3.1 times of those before reclamation, respectively. Reclamation significantly increased the rate of emergy input （defined as [renewable organic energy ＋ unrenewable source production] / [renewable environmental resource ＋ nonrenewable environmental resource]）, which was 7.4 times of that before reclamation, indicating reclamation promoted local economic development of agricultural ecosystem. Emergy consumption per capita increased by 2.7 folds, suggesting improved living levels of local residents. Diversification of the developing agricultural structure decreased the yield ratio of net emergy after reclamation. Accordingly, an increase was observed for environmental loading ratio from 0.5 to 3.7, and for system stability indices from 0. lto 0.36, suggesting reclamation of coal mining subsidence may improve the cyclic utilization efficiency and sustainability of agricultural ecosystem.
出处
《生态科学》
CSCD
2011年第3期334-339,共6页
Ecological Science
基金
国家科技支撑计划(2006BAC09B02)
山西省重大科技攻关项目(2006061099-01-02)
关键词
采煤沉陷
能值分析
农业生态系统
复垦
mining subsidence, emergy analysis, agricultural ecosystem, reclamation
