关键词: 水土流失, 喀斯特, 石漠化, 土地利用, 转移矩阵

Abstract: In order to analyze the change trend of land use, rocky desertification and soil erosion in Karst rocky desertification area, Wuchuan County in Guizhou Province was selected as the research area. Remote sensing image data in 2000, 2005, 2010 and 2015 was collected and used to obtain the spatial distribution of land use types and estimate the spatial distribution of rocky desertification levels in Wuchuan County. Water loss equations adapted for the Karst area were established by modifying general soil and water loss equations. The land use, rocky desertification, water and soil loss spatial distribution and area change trends were studied. The results showed that land use change had a significant impact on rocky desertification and soil erosion, and the increase of forest land and grassland area significantly reduced the amount of soil erosion. Forest area increased by 80.37 km2,while the dry land area decreased by 91.69 km2 from 2000 to 2015.Severe rocky desertification area decreased by 263.73 km2 from 2010 to 2015. Slightly eroded area increased by 636.13 km2 and lightly eroded area decreased by 157.21 km2 from 2000 to 2015.The moderate erosion area decreased by 356.28 km2,and the severe erosion area decreased by 111.23 km2.After the implementation of the projects of returning farmland to forests and rocky desertification in Wuchuan County from 2000 to 2015, the soil erosion phenomenon improved significantly.

Key words: soil erosion, Karst, rocky desertification, land use, transition matrix;