中国西北地区石羊河流域农业生态系统能值评价(英文)

被引：2

作者：

刘丽娟

李小玉

何兴元

肖笃宁

陈伟

机构：

[1] 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

来源：

Journal of Resources and Ecology | 2011年 / 2卷 / 03期

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;

D O I：

暂无

中图分类号：

S181 [农业生态学]; X826 [生物评价、生态评价]; F327 [地方农业经济];

学科分类号：

071012 ; 0713 ; 1402 ; 020202 ;

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。

引用

页码：232 / 240

页数：9

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