中文摘要：

从能值角度分析新疆于田县2003~2012年绿洲农业经济生态系统的可持续性。结果表明：①2003~2012年于田县绿洲农业总投入能值匀速升高（5.55~7.53×1020 sej）,工业辅助和劳力输入能值增幅大于环境资源能值,不可更新的表土损失能值持续增加,于田县绿洲农业生产对外界资源投入的依赖加剧;该县能值产出以种植业为主（85.54%~93.90%）,且2003~2012年总体呈下降趋势。②于田县绿洲农业能值自给率低,投入率高,且在2003~2012年间分别下降和升高,同时净能值产出率较低,说明该县能值效率低,独立发展能力差,竞争力弱。③2003~2012年于田县绿洲人均能值用量和能值密度有所提高,但整体水平均较低,说明近10年来于田县农业经济有所发展,但仍处于欠发达阶段。④研究期间于田县绿洲农业系统稳定性和土壤强度略升;环境负荷率在2008年后迅速增加;系统可持续性连续下降。

英文摘要：

Sustainability of oasis agricultural eco- economic system in Yutian County from 2003 to 2012 was evaluated based on emergy theory. The results show that：（ 1） In the study period,total emergy investment on agriculture of Yutian County rising constantly（ 5. 55 ~ 7. 53 × 1020 sej）,and increment of industrial assistant and labor input energy were greater than environmental resources emergy. Surface soil loss emergy continue increasing in the same periods. Agricultural production in Yutian county depended on external resources,and were aggravated from 2003 to 2012. Planting was the primary part of agricultural emergy output in Yutian County（ 85. 54 ~ 93. 90 %）,which generally declined from 2003 to 2012.（ 2） Agriculture emergy input in Yutian County was high and showed increasing trend,while emergy self- support ratio and net emergy yield ratio was low and declined. Besides,emergy efficiency index reflected low efficiency,weak competitiveness and poor independent development ability of Yutian County.（ 3） Both of emergy per capita and energy density were low in generally,with a few growth indicated that agricultural economy in Yutian County is developing in recent decade,although its economic level still in the less developed stage.（ 4） Stability and soil erosion intensity of agriculture system in Yutian County increased slightly in 2003 ~ 2012. Environmental loading ratio increased rapidly after year of2008. As a result,agriculture system sustainability in Yutian County declined in recent years.