喀斯特地区不同坡度下水土流失与石漠化相关性分析——以龙里县为例

Correlation analysis of soil erosion and rocky desertification at different slope gradients in karst areas:a case study on Longli County

为分析不同坡度等级下石漠化与水土流失的相关性,以龙里县为研究区,选取DEM、土地利用数据、石漠化数据、水土流失等数据,采用地理信息技术进行分析。结果表明:1)龙里县石漠化面积为93.4962平方千米,占龙里县国土总面积的6.15%,在石漠化区中,中度石漠化面积最高,占石漠化区总面积的72.94%;2)龙里县水土流失发生的面积为191.8319平方千米,占全县总面积的12.62%,以轻度侵蚀为主,侵蚀程度越高,面积越低;3)总体而言,坡度越高,石漠化程度与水土流失相关性越强。

Taking Longli County as the study area,with the support of GIS technology,DEM,land use data,rocky desertification data and soil erosion data are selected to analyze the correlation between rocky desertification and soil erosion at different slope gradients.The results showed that:(1)the rocky desertification area of Longli County was 93.4962 km 2,accounting for 6.15%of the total area of the county;in the rocky desertification area,the area with moderate rocky desertification was the largest,accounting for 72.94%of the rocky desertification area;(2)the soil erosion area of Longli County was 191.8319 km 2,accounting for 12.62%of the total area of the county;the area was dominated by mild erosion,and the higher the degree of soil erosion,the lower the area;(3)generally speaking,the larger the slope gradient,the stronger the correlation between the degree of rocky desertification and soil erosion.