Analysis of the Land Use Spatial Pattern and Spatio-Temporal Changes Based on Terrain Gradient:A Case Study of Pinggu District in Beijing
以北京市平谷区为例，利用DEM影像和地形位指数等方法，分析了1993至2008年土地利用在空间格局和地形梯度上的变化，为土地规划和管理提供参考。
Topography is an important factor that affects land use change,it also has a great impact on land use spatial pattern.Taking Pinggu District for example,based on DEM images,combined with terrain niche index,distribution index and land use degree composite index,this paper analyzed the land use change of Pinggu District from 1993 to 2008.In order to provide some advices on land use planning and land use management,the paper quantitatively analyzed the land use degree on terrain gradient and,explored the impact of topography on the selection of land use pattern.The result indicates that:(1) From 1993 to 2008,the area of arable land has been decreased,while the area of orchard,residential land and transportation land has been increased;(2) Arable land,residential land,transportation land and water area were mainly located at the area with the slope of 0 to 2 degrees as well as the altitude of less than 200 meters,the changed area of these types of land have been mainly taken place in this range too;(3) Arable land,orchard land,residential land,transportation land and water area were mainly distributed in the area with low terrain niche index,the grassland were mainly distributed in the area with medium terrain niche index,while woodland and unused land in high terrain niche index area.The land use degree composite index has been decreased as the increase of the grade of terrain niche.