绥宁县生态示范区农业生态系统能值分析

Emergy analysis of the agro-ecology system in the ecology demonstrational area of Suining County

本文应用能值理论与方法,分析了2004年绥宁县生态示范区农业生态系统环境基础和经济特征。结果表明:绥宁县农业生态系统不可更新资源能值投入和化肥农药的投入能值分别占总能值投入的99.974%、99.816%,能值产出中,畜牧养殖业的能值产出占总能值产出的88.22%,该县的农业生态系统是以养殖业为主。绥宁县农业生态系统2004年总能值投入为8.339×1023sej·a-1,总能值产出为1.989×1021sej·a-1,能值可持续指标值为0.108,属高消费驱动型的生态系统。绥宁县农业生态系统应采取措施减少农业生态环境的压力,优化资源利用结构,增加农业生态经济系统的产出能力,提高农业生态系统生产力,以推动该县生态示范区实现可持续发展。

Using the theory and method of emergy analysis,the paper analyzes the environmental basis and economic features of agro-ecology system practiced in the ecology demonstrational area of Suining County. The results make it clear that the emergy inputs of nonrenewable resources, and chemical fertilizers and pesticide account for 99. 974% , 99. 816% of the total emergy inputs in the agro-ecology system of Suining County, respectively, the emergy outputs of stock raising account for 88.22% of the total emergy outputs,which is the main proportion of the agro-ecology system. The total input and output of emergy are respectively 8. 339 × 10^23 sej· a^-1 and 1. 989 × 10^21 sej· a^-1 in agro-system in Suining County in 2004, and the sustainability index of emergy is 0. 108. So the agro-system is a high consuming ecological system. Therefore, improving environmental input and optimizing emergy use structure can improve the productivity of the farming system and the sustainable development ability of the ecology demonstrational area of Suining County.