三峡库区近30年土地利用时空变化特征分析

利用三峡库区1975年、1987年、1995年、2000年和2005年的遥感影像数据,提取各期土地利用图。以各期土地利用图为基础图件,利用G IS技术,分析了三峡库区各期土地利用类型的数量、空间分布及变化趋势,分析表明库区的耕地、林地和草地都在减少,库区近30年建设用地和河流水面的增加最为明显。同时引入土地利用变化的景观特征指数、土地利用变化速度、土地利用程度指数来总结三峡库区近30年来土地利用变化的主要时空变化特征。采用多种特征指数相结合的研究方法,有利于了解三峡库区土地利用变化的特征,可以进一步指导库区的土地利用规划,为库区的生态环境保护提供参考。

Analyses on temporal-spatial traits of land use in three gorges during 30 years

Based on MSS data in 1975 and Landsat TM data in 1987,1995,2000 and 2005,the land use change in the reservoir area of three gorges is conducted and several indexes to reflect the temporal-spatial traits during 30 years are discovered.It is showing that the areas of cultivated land,forestry land and grass land have been decreased while the areas of construction land and water have been increased during last 30 years.With combination of several feature indexes,the land use change trait of three gorges is understood,which is helpful for the land planning in reservoir area of three gorges and can provide reference for ecological environment protection.