中文摘要：

以中国西北典型干旱和贫困区甘肃省定西市安定区循环农业系统为例,基于10年跟踪调研数据,建立了SD模型,分析了该循环农业系统的生态、经济综合效应,模拟未来10年发展趋势,检验系统发展缺陷,提出未来优化的方向。结果证明：循环经济不但能大幅提升经济效益,而且具有减少水耗、减少化肥使用量、消除牲畜粪尿污染,减少化石能源消耗和CO2排放等显著的生态经济效益。并能够通过长期循环运行和优化调控,不断扩大经济效益、生态效益,消除生态脆弱及贫困双重压力,实现可持续发展。定西市安定区循环农业系统的构建思想、构建方法、评价模型和优化方式对我国干旱与半干旱类似地区的发展具有重要借鉴意义。

英文摘要：

Taking the development of circular agricultural system and a decade of tracking study in Anding District,Dingxi City,Gansu Province in the northeast of China which faces with the double huge pressures of drought and poverty as the example,this study built and applied SD model to analyze the integrated ecological and economic effects of circular agriculture system,simulated their development trends in the next 10 years,tested the defect of system development and put forward the direction of the future improvement. Result shows that the circular economy did not only greatly improved economic benefits,but also reduced the water consumption,reduced chemical fertilizer use,eliminated the pollution of livestock manure,reduced fossil energy consumption and CO2 emissions and so on. It had significant ecological and economic benefits. Moreover,through the long cycle and improvement regulation,the circular economy enlarged continuously the ecological and economic benefits,eliminated the double pressures of ecological fragility and poverty,and achieved sustainable development.This study introduces in detail the construction ideas,construction method,model evaluation and improvement ways of circular agricultural system. This has important reference significance to the development of the similar parts of the world.