摘要
能值理论 (emergytheory)是综合分析生态经济系统的各种能量流的转换机理 ,并定量研究生态效益与经济效益及其关系的重要理论 .在简要阐述能值理论有关内容的基础上 ,以黑河流域中游张掖地区农业生态经济系统为例进行了实证研究 .根据能值的投入产出分析的结果表明 ,张掖地区的农业发展存在许多问题 :环境负荷不断增加、产出率降低、产品经济成本增加、能值持续性指数下降等 ,这使得该区农业的持续发展受到严重影响 .应采取一定的措施来增加农业生态经济系统的产出能力 。
Emergy theory offered by Odum H T was applied widely to track energy flow and evaluate ecological and economic benefit in eco-economic system. In the paper, basic concepts were explained in brief. Then an empirical analysis of agricultural eco-economic system in Zhangye Prefecture in the middle reaches of the Heihe River was made. A paradigm (1999) of the emergy flow of agricultural eco-economic system was presented in Zhangye Prefecture, together with the main indices that reflect the situation of the system. For the last five years (1995-1999), the analysis showed that environmental load increased from 0.816 to 1.564, yield ratio decreased from 2.116 to 1.902, the ratio of economic input which reflects economic cost of product rose from 3.93 to 6.33, and the index of sustainability reduced from 2.59 to 1.216 in Zhangye district. These indices, which reflect the efficiency of resources use, showed that the development of agricultural eco-economic system faced severe situation in Zhangye Prefecture. Some measures, such as changing agriculture's structure and increasing the price of water resource etc., should be taken to improve agricultural product conditions in order to achieve sustainable development of agriculture in Zhangye Prefecture. Emergy technique is probably useful at integrated environmental and economic accounting.
出处
《冰川冻土》
CSCD
北大核心
2002年第4期374-379,共6页
Journal of Glaciology and Geocryology
基金
中国科学院知识创新工程重大项目 (KZCX1 0 9 0 4
KZCX1 100 3 )资助
