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| Analysis of spatial relation between rocky desertification and karst landforms in northwest Guangxi Province based on GIS and RS technology |
| Wu Lianglin1,2,Chen Qiuhua1,Lu Yuan1,Zhao Lin1 |
| 1.College of Resources & Environment,Guangxi Teachers' Education University,530001,Nanning;2.College of Geography & Planning,Sun Yat-sen University,510275,Guangzhou:China |
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Abstract 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.
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Received: 03 September 2008
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