Spatial-Temporal Differentiation Rule and Sustainable Development of Oasis Agricultural Eco-Economic System:A Case Study of Yili Prefecture, China
结合能值法和GIS技术，分析了伊犁地区1989-2008年绿洲农业生态经济系统的时空特征，发现系统整体可持续但可持续指数波动下降，并提出了优化农业结构等对策。
Through the coupling analysis of emergy method and GIS technique,this paper take the Yili prefecture as an example,has discussed the spatial-temporal characteristics and the overall tendency of oasis agricultural eco-economic system.Following conclusions were obtained:①during 1989-2008,the total emergy input and output of the oasis agricultural eco-economic system in Yili prefecture have a trend of sustainable development.②According to the sustainability analysis with the emergy indices,the agricultural eco-economic systems in Yili prefecture are still at a sustainable status at present.However,the emergy-based sustainability index(ESI) has a trend of decreasing with fluctuations.③In the study area,the development level of agricultural eco-economic system present a gradient pattern of northeast-southwest;the system sustainable development of agricultural eco-economic system present a spatial pattern of higher in the south and lower in the north;the system status present a spatial pattern ofone axis and two wings.④In order to realize the sustainable development of agricultural system and to prevent the deterioration of environment,the Yili prefecture should adopt the following measures in the future,such as optimizing the interior structures of agriculture,improving the supporting system of agricultural production and reforming the traditional mode of agricultural production.