| 中国西北地区石羊河流域农业生态系统能值评价 |
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| 引用本文： | 刘丽娟,李小玉,何兴元,肖笃宁,陈伟.中国西北地区石羊河流域农业生态系统能值评价[J].资源与生态学报（英文版）,2011(3):232-240. |
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| 作者姓名： | 刘丽娟 李小玉 何兴元 肖笃宁 陈伟 |
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| 作者单位： | 中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室; |
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| 基金项目： | co-supported by National Natural Science Foundation of China(Grant No.40971272and No.40830746) |
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| 摘 要： | 通过能值方法分析了石羊河流域农业生态系统的资源环境基础和经济特征。结果表明,石羊河流域中下游凉州区和民勤绿洲的能值总投入呈降低趋势,能值投资率都偏高,生产成本较大;能值产出率低,对购买能值的利用效率不高;但能值自给率有所提高;环境载荷率高,农业生态环境所受压力较大,系统可持续发展指标表明两个绿洲经济系统极为不发达,属于消费型经济系统,并且人均可用能值和能值密度都呈降低趋势。
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| 关 键 词： | 能值分析 能值指数 农业生态经济系统 中国西北地区 |
Emergy Evaluation of Agro-ecosystem of Shiyang River Basin,Northwestern China |
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| LIU Lijuan,LI Xiaoyu,HE Xingyuan,XIAO Duning , CHEN Wei State Key Laboratory of Forest , Soil Ecology.Emergy Evaluation of Agro-ecosystem of Shiyang River Basin,Northwestern China[J].Journal of Resources and Ecology,2011(3):232-240. |
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| Authors: | LIU Lijuan LI Xiaoyu HE Xingyuan XIAO Duning CHEN Wei State Key Laboratory of Forest Soil Ecology |
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| Institution: | LIU Lijuan,LI Xiaoyu,HE Xingyuan,XIAO Duning and CHEN Wei State Key Laboratory of Forest and Soil Ecology,Institute of Applied Ecology,CAS,Shenyang 110164,China |
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| Abstract: | This paper presents an ecological analysis of agricultural systems in arid region of Northwestern China. Emergy analysis, a method for environmental accounting developed by H.T. Odum in the Eighties, is appropriate for this task because of its ability to transform different types of inputs to a common form (solar emergy) in order to allow scientific and objective comparisons across different period and regions. Taking Liangzhou and Minqin oases, located in the middle and lower reaches of the Shiyang River b... |
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| Keywords: | emergy analysis emergy indices agricultural eco-economic system Northwestern China |
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