土地利用变化对干旱区典型流域生态系统服务价值的影响

运用遥感和GIS技术以及谢高地等人提出的生态系统服务价值系数.分析了近30年来玛纳斯河流域土地利用变化对生态系统服务价值的影响.结果表明,1976-2002年问玛纳斯河流域土地利用变化显著,以未利用地大量减少和建设用地持续增加为特点,所产生的环境响应是积极的,生态系统服务年度总价值在波动中提高,由1976年的103.57×10~8元增长到2002年的132.85×10~8元,各单项服务价值总体呈增加趋势,流域生态环境状况向良性发展.

Impacts of Land Use Changes on Ecosystem Services Value in Typical River Basin of Arid Area

Taking Manas basin as study area,impacts of land use changes of recent 30 years on ecosystem services value are analyzed by using remote sensing and GIS as well as coefficient of ecosystem services value.The results show that between 1976 and 2002,land use in Manas river basin was changed significantly,in which area of unused land shrank considerably and the area of construction land kept increasing.The environmental response to the changes was positive,and the annual gross value of ecosystem services increased with fluctuation from 103.57 ×10~8 yuan per year in 1976 to 103.57 X 10~8 yuan per year in 2002.For single ecosystern services value,it presented increasing tendency generally.In this period,the ecological environment of the basin developed towards favorable status.The sensitivity analysis demonstrated that the lack of flexibility exists between ecosystem services value and the coefficient of ecosystem services value so that the results derived from this study is reliable.