【摘要】 喀斯特石漠化从本质上来讲是喀斯特地区的成土速率远小于水土流失的速率而造成的土地生产力的退化过程。坡度起伏决定着地表现代侵蚀作用的强弱,影响着水土流失的强度;坡度越大,地表物质的不稳定性就越强,土壤越容易遭受侵蚀而变薄。在前期工作中,构筑了贵州省岩溶地区1∶500 000坡度分级图和石漠化分布图,对岩溶地区坡度图和石漠化图进行空间叠加分析,研究坡度与石漠化形成的相关关系。贵州省岩溶地区坡度主要集中于10°~25°之间,不同程度石漠化分布最集中的地区是>25°的坡地区;在坡度>18°的地区,石漠化的发生率基本随着坡度的增大而增大,强度石漠化的表现尤为明显;<18°的坡地区石漠化程度主要以轻度和中度为主。更多还原

【Abstract】 Rocky desertification in the karst area is a land degradation process in nature where the rate of soil formation is lower than that of soil erosion.Slope degree affects the extent of soil erosion.The greater slope degree is,the more instable surface material is.The two maps of slope gradient and desertification distribution on a scale of(1∶)500 000 in Guizhou Province were overlapped and analyzed in order to discuss the correlation between slope degree and rocky desertification.It was found that slop degrees ranged mainly from 10°to 25°.Where slope degree was greater than 25°,the possibilities of the desertification occurrence at low,moderate or strong rate were all very high.In addition,the occurrence of rocky desertification increased as slope increased,especially where slope degree was greater than 18°,the trend toward strong rocky desertification was apparent.The desertification was mainly at low or moderate extent where slope degree was less than 18°.The reasons for the correlation between desertification and slope degree in this region were discussed preliminarily.更多还原