In order to preferbly evaluate the sustainable development of suburban agro-ecosystem, based on the theories and methodologies of energy, The author analyzed the inputs and outputs of Huaxi District agro-ecosystem by using raw data of 2010. The results showed that the total energy input and output were 2. 25 1019sej and 1. 32 1019sej respectively. The renewable energy of total energy input was 47. 56% and unrenewable industrial energy was 34. 67%. The net output ratio was 1. 18, energy investment ratio was 0. 95, Sustainability index is 1. 07, which indicated that the region was in the stage from traditional agriculture to modern agriculture. The energy input level and conversion efficiency were not high. With the increase of industrial auxiliary energy,the agro-ecosystem might lead to greater pressure on the ecological environment.%为了更好地评价城郊农业生态系统可持续发展状况,采用能值分析理论与方法分析了花溪区2010年农业生态系统的能值投入与产出.结果表明:花溪区总能值投入为2.25×1019 sej,总能值产出为1.32×1019 sej；可更新能值投入占能值总投入的47.56％,不可更新工业辅助能值投入占能值总投入的34.67％,净能值产出率为1.18,能值投资率为0.95,可持续发展指数为1.07.说明,花溪区正处在传统农业向现代化农业转型的阶段,系统能值投入水平和转化效率不高,随着工业辅助能值投入增加,农业生态系统会对生态环境造成较大压力.
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