山西省农业生态经济系统能值分析

采用能值分析方法对2005年山西省农业生态经济系统的投入产出状况、运行效率和环境负荷进行了系统分析.结果表明：2005年，山西省农业生态系统仍处于主要依赖人力有机能和环境资源的传统农业阶段；研究区系统能值投资率（EIR）为1.07，能值产出率（EYR）为0.99，环境负载率（ELR）为6.55；在农业结构调整方面，畜牧业取得了长足发展，而小杂粮、蔬菜和干鲜果的能值产出仍较小，远未成为优势产业；研究区农业生态系统整体的回报效率较低，承受的压力较大.山西省今后应继续转移农业剩余劳动力、控制人口增长，同时加大农业科技辅助能值投入、提高环境资源的利用效率，使系统能值的投入产出向高水平发展.

Emergy analysis of agro-ecolomic system in Shanxi Province.

By the methods of emergy, this paper studied the input and output, working efficiency, and environmental loading of the agro-ecolomic system in Shanxi Province in 2005. The results showed that in 2005, the agro-ecolomic system in Shanxi still stayed in the period of traditional agriculture, which mainly depended on manpower and environmental resources. The emergy investment ratio (EIR) was 1.07, emergy yield ratio (EYR) was 0.99, and environmental loading ratio (ELR) was 6.55. In the structural adjustment of agriculture, stockbreeding had made great strides forward, but grain crops other than rice and wheat, vegetables, and fruits still had smaller emergy yield and were far from becoming dominant industry. The efficiency of the agro-ecolomic system was lower, and its environmental loading press was bigger. For the future, the surplus labors in agriculture in Shanxi should be shifted continually to other industries, and the high quality emergy such as agricultural science and technology should be increased to improve the use efficiency of environmental resources and the input and output of the system emergy.