基于GIS/RS的桂西北土地石漠化与喀斯特地形空间相关性分析

基于GIS、RS技术，探讨喀斯特地形坡度量算的适宜方法，并提取桂西北喀斯特山区地貌类型、坡度、坡向数据，结合2006年桂西北石漠化数据进行地形要素与石漠化空间相关性分析。结果表明：桂西北喀斯特石漠化与地貌类型、坡度有明显的空间相关性，表现在低山和高丘陵地形区的石漠化发生率较高；在0°-25°坡度地形区中，石漠化发生率随坡度增大而平缓下降，大于25°坡度区的石漠化发生率却大幅上升；各坡向的石漠化发生率基本相近，石漠化与坡向没有明显空间相关性。研究结果可为桂西北喀斯特山区土地利用布局、石漠化治理和生态系统恢复提供决策依据。

Analysis of spatial relation between rocky desertification and karst landforms in northwest Guangxi Province based on GIS and RS technology

The relation between karst rocky desertification and soil erosion is a kind of mutual causal relation.Terrain condition is an important influence factor for soil erosion and rocky desertification.The paper discussed the suitable methods for gradient calculation in northwest Guangxi Province,and then analyzed the landforms,gradient and aspects data based on GIS technology,and get the rocky desertification data of the region based on remote sensing technology.By the means of spatial overlay analysis of the terrain and rocky desertification data,the paper focused on discussing the spatial relation between rocky desertification and karst terrain condition in the region.The study result shows that the ratio of rocky desertification is relatively higher in the low-mountain and high-hills areas,the ratio of rocky desertification in the 0°-25°gradient areas declines gently with the slope increment,but the ratio in the great than 25°gradient areas increases substantially.The rocky desertification is obviously interrelated to the landforms and gradient factor,but it is not interrelated to the aspect factor.