| 张希彪.泾河流域农业生态经济系统的能值研究[J].干旱地区农业研究,2005,(5):196~201 |
| 泾河流域农业生态经济系统的能值研究 |
| Emergy analysis of agricultural eco┐economic systems in Jinghe river valley |
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| DOI：10.7606/j.issn.1000-7601.2005.05.39 |
| 中文关键词: 生态经济系统 能值分析 可持续发展 泾河流域 |
| 英文关键词:Loess Plateau agricultural eco-economic system emergy analysis sustainable development Jinghe river valley |
| 基金项目:黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金(10501-147)； 甘肃省教委资助项目(049B-08)； 陇东学院重点资助项目(Sznk0222) |
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| 中文摘要: |
| 应用能值分析的理论与方法,对黄土高原泾河流域农业生态经济系统的能值流进行了分析。结果表明:投入量太阳能值为3.36×1019sej,产出量太阳能值为3.07×1020sej,初级生产力为5.04×1019sej,不可再生能值为6.35×1019sej。该区处在以传统农业为主向现代化农业转型的阶段。系统能值投入水平和转化效率低,环境负荷不断增大,产品经济成本增加,能值持续性指数下降等。应采取措施增加农业生态经济系统的产出能力,减少农业生态环境的压力。 |
| 英文摘要: |
| Based on the theory of emergy analysis, this article investigates quantitatively the emergy flow of agricultural eco-economic systems in Jinghe river valley on Loess Plateau. The results indicate that the solar emergy input, the solar emergy output, the primary productivity and the un-renewable emergy are 3.36×1019sej, 3.07×1020sej, 5.04×1019sej and 6.35×1019sej, respectively. This region is now in the stage of transformation from traditional agriculture to modern agriculture. The agricultural eco-economic systems face some severe problems, such as low emergy input and emergy transformation efficiency, increased environmental loading ratio and production cost, and reduced emergy sustainability index, etc. Suitable measures should be taken to improve the productivity of agricultural eco-economic systems and to lessen the stress of ecological environment in Jinghe river valley. |
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