学术
摘 要:
以甘肃省镇原县北庄村为例，应用H．T．Odum能值分析方法，分析退耕还草前后农业生态系统的能值变化。结果表明，退耕还草后北庄农业生态系统的净能值产出率提高了35．14％；环境负荷力降低8．31％；系统可持续发展性指标提高47．38％；系统稳定性指数也由0．809提高到1．015。退耕还草对北庄农业生态系统生产力的提高和系统的可持续发展起到了积极的作用。但农牧系统耦合度降低了41．74％，应采取措施提高农牧系统耦合度，实现农业生态系统平衡发展。[著者文摘]
文章出处:
《干旱地区农业研究》-2008年26卷1期 -112-117页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1000-7601（2008）01-0112-06
Dynamic analysis of emergy for agro-ecosystem in the region of cropland to grassland conversion --A case study of Beizhuang Village, Zhenyuan County in Gansu Province
HUANG Wen-de, NIU Jun-yi , GAO Yu-hong, YANG Xiao-zhou, ZHAO Kui （College of Agronomy, Gansu Agricultural University, Lanzhou , Gansu 730070, China）
Abstract:
Taking Beizhuang village, Zhenyuan County of Gansu Province as an example and using H. T. Odum emergy analysis method, this paper studies the changes of agro-ecosystem emergy after cropland to grassland conversion. The results indicate that after cropland to grassland conversion, net emergy yield ratio increases by 35.14 %, environmental loading ratio decreases by 8.31%, emergy sustainability index （ESI） increases by 47. 38%, and emergy stability index increases from 0. 809 to 1. 015 in Beizhuang village agro-ecosystem. The cropland to grassland conversion plays an important role in the improvement of agro-ecosystem productivity and sustainable development. But the system coupling degree between agriculture and animal husbandry decreases by 41.74 %, we should adopt measures to enhance it and realize the balance development of agro-ecosystem.[著者文摘]
Key words:
conversion of cropland to grassland; agro-ecosystem; emergy
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