东北地区农业生态系统的能值分析

利用能值分析方法对东北地区农业生态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,该区农业生态系统能值投以人工辅助能源为主,净能值产出率相对较高;由于资源优势明显,环境压力相对较小,农业生态系统运行状况良好,黑、吉、辽三省可持续发展指数分别为1.31、0.94和0.70,可持续发展性强。三省中辽宁省能值投入率最高,环境负荷最大,农业集约化程度最高,可持续发展性能指数最小;黑龙江省能值投入率最低,环境负载率最低,可持续发展性能最强;为了获得高质量的农产品,促进农业生态系统的建设和可持续发展,东北地区应当加强高质量能值特别是科学技术的投入,同时注重自身资源优势的保护和高效利用。

Energy analysis of the agro-ecosystem in the northeast of China

This article systematically evaluates the input-output condition,work efficiency and environmental loading ratio of the Agro-ecosystem in the Northeast of China on the basis of energy theory.It is shown that large part of man-made energy flow such as chemical fertilizers have been inputted to the Agro-ecosystem.The index of sustainability of the three provinces Hei,Ji,Liao,are 1.31,0.94 and 0.70,respectively,indicating that the Agro-ecosystem in this area runs well and is sustainable with a higher energy yield ratio and lower environmental loading ratio.Because of the highest energy investment ratio and environmental loading ratio,Liaoning has the lowest sustainable index,while Heilongjiang has the highest.From the perspective of energy analysis,high quality energy investments such as science should be increased to improve the quality of the farm products and the people here should conserve their resource and utilize it efficiently to keep it sustainable.