中文摘要：

采用能值分析的理论和方法,通过典型能值分析指标的计算,研究了尉犁绿洲1995-2006年间农业生态系统能值的动态变化,评价该绿洲农业生态系统的发展现状。结果表明：塔里木河中下游典型绿洲尉犁的能值总投入明显上升,其中购买能值比重较高,且增长迅速;尉犁绿洲能值总产出12年来稳步上升,种植业处于其主导地位,且上升趋势明显;尉犁绿洲农业经济和农牧民生活水平稳步提高,但系统产业结构过于单一,环境负荷率逐年增加,农业生态系统的可持续性不断降低。

英文摘要：

Based on the theories and methodologies of emergy,the structure and function of agro-ecosystem of Yuli oasis in 1995-2006 was evaluated.According to the emergy theories,some ratios and indices were calculated.The results showed that both the total emergy input and output were increased obviously,as well as the emergy yield ratio（EYR） and the emergy per capita（EPC）.However,there was a very single industrial structure in agro-ecosystem of Yuli oasis.In addition,environmental pressure of system increased significantly,and sustainability of system decreased continuously.