中文摘要：

针对都市型现代农业建设的各个阶段,以多时相TM影像为数据源,以地块为基本单元提取土地利用/覆盖变化信息,选取植被覆盖度作为生态系统质量状况的表征系数,建立基于质量状态分析的生态服务价值定量评估模型,通过生态价值变化分析来表达土地利用变化所造成的生态环境质量改善程度。结果表明：通过都市型现代农业建设,对各个地块的土地利用方式进行合理规划和有效建设,土地利用类型趋于多样化,生态服务功能增强,建设后期的生态服务价值相对于建设之前明显提高,林地、草地和水域面积的增加是该区生态服务功能增强的最主要原因。作为都市现代农业建设示范区,要严格控制耕地面积的减少,合理转化未利用土地,这样才能实现生态环境改善和农业生产双丰收。

英文摘要：

Until now,very little is known about the effect of urban modern agricultural development on ecological service.We therefore examined the different stages of urban modern agricultural development in a demonstration zone of Beijing.Multi-temporal Landsat TM images were used for understanding the change of land use and cover.Then,a quantitative evaluation model was developed for ecological service estimation by taking vegetation cover as a parameter of ecosystem quality.We found that the ecological service value was great improved by urban modern agricultural development which diversified land-use types and increased the forestry,grass and water covers.Our results indicate both environmental improvement and agricultural production increasing can be reached by urban agricultural development,especially on preserving farmland and better transformation of farmland.