南水北调中线水源区土地利用变化的生态服务价值研究

Research on Ecological Services Value of Land Use Change inWater Supplying Area of the Middle-Route ofthe South-to-North Water Diversion Project

在RS和GIS技术支持下分析了南水北调中线水源区1990、2000和2010年三期土地利用现状数据,并对其土地利用变化过程进行探讨,并评估该区生态系统服务价值.研究结果表明:(1)南水北调中线水源区主要土地利用类型为林地、耕地和草地,其中林地面积占比最大,土地利用变化也以三者之间的相互转换为主;(2)南水北调中线水源区生态服务价值构成比例从高到低依次为林地、耕地、草地、水域和未利用地,研究区的生态服务价值呈现微弱的先增加后下降的态势,总体比较稳定,波动不大.(3)南水北调中线水源区各土地利用类型的生态系统服务价值的敏感性指数(CS)均小于1,表明其生态服务价值对价值系数不敏感,价值系数的准确性对其生态服务价值的影响不显著.

With the support of RS and GIS technology,this paper analyzes the land use status data in the source area of the middle route of the South-to-North Water Diversion(MR-SNWD)project in 1990,2000 and 2010,and discusses the change process of land use,and evaluates the ecosystem service value of the area.The results show that:(1)The main land use types are forest land,cultivated land and grassland,among which forest land occupies the largest proportion and the change of land use is also dominated by the mutual conversion among the three.(2)The proportion of ecological service value in the water source area of MR-SNWD is forest land,cultivated land,grassland,water area and unused land in order from high to low.In 1990,2000 and 2010,the value of ecological services in the research area was showing a weak trend of first increase and then decrease,which was generally stable with little fluctuation(3)The sensitivity index(CS)of ecosystem service value of each land use type in the source area of the MR-SNWD project is all less than 1,indicating that its ecological service value is not sensitive to the value coefficient,and the accuracy of the value coefficient has no significant influence on its ecological service value.