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基于土地利用空间分析指标和图谱方法,利用五期土地利用数据,结合GIS和RS技术,得出南四湖流域1990?2010年土地利用/覆被变化的时空特征:(1)1990?2010年南四湖流域土地利用方式以耕地、城乡建设用地和水域为主,流域土地利用类型的分布与流域内地形密切相关。(2)近20年流域综合土地利用动态度为0.39%,总体变化速度较缓慢。其中,南四湖流域未利用地的减少速度最快,是该流域土地利用变化最独特的特征。(3)流域内各土地类型存在着不同程度的相互转换,城乡建设用地占用耕地是各阶段土地利用类型转换的主要特点,集中分布在流域内的各个县域;82.39%的未利用地在1990?1995年转化为人工水域,主要分布在南四湖湿地自然保护区;耕地与林地和草地之间的相互转换主要发生在流域东部的多山地丘陵地带。
Based on the spatial analysis index and the map method of land use, the spatio-temporal characteristics of land use / cover change from 1990 to 2010 in Nansihu Lake Basin were obtained by using the five land-use data and GIS and RS techniques. (1) From 1990 to 2010 The land use patterns of Nansi Lake Basin mainly include cultivated land, urban and rural construction land and water area. The distribution of land use types in the basin is closely related to the terrain in the basin. (2) The dynamics of integrated land use in the basin in the past two decades was 0.39%, and the overall change rate was slower. Among them, the unused land in Nansi Lake basin has the fastest reduction rate, which is the most unique feature of land use change in this basin. (3) The types of land in the basin are transformed to different degrees, and the cultivated land occupied by urban and rural construction land is the main characteristic of land use type conversion in all stages, and is concentrated in all counties in the basin. 82.39% of the unused land was in 1990? In 1995, it was transformed into artificial waters and mainly distributed in the Nansihu Wetland Nature Reserve. The conversion between cultivated land and forest land and grassland took place mainly in the hilly area in the eastern part of the drainage basin.