以1991年、1998年和2006年3期遥感影像数据为基础,采用土地利用转移矩阵、动态度、利用度和生态环境效益指数模型,研究了漓江流域1991年以来的土地利用变化及其对生态环境效益的影响.结果表明,漓江流域土地利用/覆被于1991～2006年间发生了较大变化,变化的总体趋势为林地、耕地、草地和水域面积减少,并转化为园地、未利用地和建设用地;1991年以来,漓江流域未利用地、建设用地和园地的正向变化速度较大,而林地和草地的负向变化速度较大.漓江流域土地利用综合变化速率呈现增加趋势;土地利用度变化呈现波动特征;漓江流域土地利用/覆被变化的主要人文驱动力为经济因素、政策因素等方面;1991～2006年间土地利用变化降低了漓江流域的生态环境效益,林地向园地的转化及耕地向建设用地的转化是区域生态环境效益下降的主要原因.%Based on the multi-temporal remotely sensed data in 1991, 1998 and 2006, the land use change and its influence on eeo-environment benefit in Lijiang fiver basin since 1991 were analyzed using the methods of transition matrix of land use types, dynamic degree, index of land use intensity and eco-environment value index model. The land use/cover changed significantly from 1991 to 2006. Generally, the areas of woodlands, agriculture lands, grasslands and water area which transformed into building lands, unused lands and garden lands were decreasing. The areas of building lands, unused lands and garden lands had large positive dynamic degrees while those of woodlands and grasslands had large negative dynamic degrees since 1991. On the whole basin, the changing rate of land use showed increasing tendency and the use intensity of all the land use types showed fluctuation characteristics. The main human driving forces of the land use/cover change in Lijiang fiver basin were the economic development and adjustment of the macro policy. From 1991 to 2006, the land use change had reduced the eco-environmental benefit of the Lijiang fiver basin, and the conversion of forest lands to the garden lands and the conversion of farmlands to building lands were the main reasons.
展开▼
