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生态系统的能值特征是生态系统结构与功能的综合性反映,也是生态系统物质循环、能量流动以及信息传递特征的反映.应用能值分析的原理与方法估算了新疆北屯绿洲生态系统能值特征.结果表明:北屯绿洲生态系统2005年末的能值投入为7.84×1020sej,产出为7.46×1020sej.从能值角度讲,北屯农业经济系统能值输入主要依靠外界有偿能值,属于资源输入型,对外界依赖程度较高,环境资源利用率低,相关的能值指数从不同角度反映了绿洲生态系统的能值特征及耗散机制.
The emergy characteristics of ecosystem are the comprehensive reflection of ecosystem structure and function, and are also the reflection of ecosystem material circulation, energy flow and information transmission characteristics. The principle and method of emergy analysis are used to estimate the ecosystem emergy of Beitun Oasis in Xinjiang The results showed that the emergy input of Beitun oasis ecosystem was 7.84 × 1020sej at the end of 2005 with an output of 7.46 × 1020sej.From the point of emergy, the emergy input of Beitun agricultural economic system mainly depends on the external payable energy, belonging to Resource input type, high dependence on the outside world, low utilization rate of environmental resources, and the related emergy index reflect the emergy characteristics and dissipation mechanism of oasis ecosystem from different angles.