GIS支持下的土地石漠化与山地气候空间相关性分析

以桂西北喀斯特山区为例,应用基于回归统计的气候模型,结合DEM/GIS提取高程、坡向等气候地形因子,计算获得研究区山地气候空间分布数据,并结合桂西北2008年石漠化数据进行空间统计分析土地石漠化与山地气候空间相关性。结果表明,桂西北喀斯特土地石漠化发生率随年均气温升高呈平缓增大,并随年均降水量增大呈较快速增大态势;在主要的年均气温区内,河池市的石漠化发生率从29.4%变化为34.4%,变化幅度为5.0%,而在主要的年降水区中,石漠化发生率从18.2%变化为42.8%,变化幅度为24.6%,降水量因子对石漠化的影响大于气温因子。桂西北土地石漠化与年均气温及年均降水量呈一定的正相关关系。

Study on Spatial Relations between Rocky Desertification and Mountain Climate in Northwest Guangxi Province Based on GIS Technology

Based on the statistical regression climate model and combined with the terrain data calculated with DEM/GIS technology and the rocky desertification data generated from TM remote sensing images in 2008,the paper studied the characteristics of mountain climate distribution in Northwest Guangxi Province,and analyzed the spatial relation between rocky desertification and mountain climate conditions.The result showed that the ratio of rocky desertification in the region increased slowly with the increase of mean annul temperature,and it increased relatively fast with the increase of mean annual rainfall,the variation range of rocky desertification ratio in the main mean annual temperature areas was 5% from 29.4% to 34.4%,and the number is 24.6% from 18.2% to 42.8% in the main annul rainfall areas,it can be concluded that the effect of rainfall factor on rocky desertification is greater than that of temperature factor,and rocky desertification is positively related to mean annual temperature and rainfall conditions in the region.