中文摘要：

以南京市九乡河流域为研究区域,以2003、2009年两期遥感影像数据为基本信息源,在调整生态系统服务价值系数的基础上,计算流域生态系统服务价值,并利用ArcGIS的空间分析功能,研究流域生态系统服务价值的空间异质性及其变化,以及城市化与生态系统服务价值之间的关系。结果表明：2003—2009年,流域生态系统服务价值损失2.63%,达643.1×104元,其中上游生态系统服务价值增加1.57%,而中游和下游则分别减少2.18%和10.58%,耕地流失是中游、下游和流域总生态系统服务价值减少的主要原因;食物生产、保持土壤等单项生态系统服务价值降低,而水文调节和提供美学功能的生态服务价值增加;九乡河流域生态系统服务价值的空间异质性发生了明显的变化,生态系统服务价值降低的区域主要集中在下游的仙林大学城以及中游靠近主城区的西村一带,而升高的区域主要分布在九乡河沿岸;城市化对流域生态系统服务价值的负效应明显。制定严格的生态规划,加强对流域开发建设的分类指导,是恢复和维护九乡河流域生态系统服务功能的有效途径。

英文摘要：

Taking Jiuxiang River watershed in Nanjing city（Jiangsu,China） as a case study area,its two phases of remote sensing images obtained in 2003 and 2009 as the basic data source for assessment of ecosystem service values,and based on the adjustment of value coefficient,the ecosystem service values of Jiuxiang River watershed were calculated.In addition,the spatio-temporal characteristics of ecosystem service values and the interrelations between urbanization and ecosystem service values were studied by using the spatial analysis function of ArcGIS.The results showed： the loss of ecosystem service values of Jiuxiang River watershed was 2.63%,equaling to 643.1×104 yuan,of which the upstream increased by 1.57%,the midstream and the downstream decreased by 2.18% and 10.58% respectively,and the decrease of cropland was the major cause for the decrease of ecosystem service values.The values of individual ecosystem service of food production and maintain soil conservation decreased,while the values of hydrologic regulation and aesthetical function increased;the regions with higher ecosystem service values were mainly concentrated along the Qinlong Mountain at the upstream,Linshan Mountain at the midstream and Qixia and Yangshan mountains in the downstream,and the region with lower ecosystem service values was found mainly in Xianlin University Town,and the moderate one was mainly distributed in agricultural area of the midstream;the spatial distribution of ecosystem service values changed significantly in Jiuxiang River,the region with reduced ecosystem service values was mainly concentrated along the Xianlin University Town in the upstream and Xicun in the midstream,and the region with increasing values was distributed mainly along Jiuxiang River;urbanization had a negative effect on ecosystem service values,which showed the reduction of ecosystem service values was related with urbanization.So,we should conduct a watershed ecological planning to strengthen the classification guidance of watershed development and c