淮河上游山丘区不同地形因子下的土地利用变化研究

Land-use Change under Different Terrain Factor in Upstream Mountain Area of Huaihe Basin

利用1995、2000年淮河上游山丘区土地利用数据,结合数字高程模型(DEM),采用GIS空间分析功能及数理统计方法,在各地形因子(高程、坡度、坡向)的不同等级梯度上,分析区域内的土地利用变化。结果表明,各地形因子的不同等级对土地利用变化分布特征的影响不同。低海拔、小坡度的地形对耕地、城乡居民用地的变化影响较大;高海拔、大坡度的地形对林地、草地的变化影响较大;坡向对各土地利用变化的影响程度不大。另外,各地形因子对水域和未利用地变化的影响不大。

According to the land-use data of the upstream mountain area in Huaihe basin between 1995 and 2000, combining with digital elevation model （ DEM ）, adopting the spatial analysis functions of G1S and methods of mathematical statistics , the land-use changes in this region have been analyzed on the different grades with all terrain factors （elevation, slope, aspect）. The results indicated that different terrain factors＇ grades have effects on the distribution of land-use changes. The topography with low altitude and small slope have great influence on farmland and urban-rural residential land; high altitude and large slope have great influence on woodland and grassland; and the aspect has less impact on each land-use change. All terrain factors have little influence on water and unused land.