基于USLE模型的大方县1990-2015年土壤侵蚀变化分析

Analysis of Soil Erosion Changes in Dafang County from 1990 to 2015 Based on USLE Model

对贵州省大方县1990-2015年土壤侵蚀量进行研究,为该地的水土保持和石漠化治理等工作提供依据。基于GIS/ENVI技术和方法,结合USLE土壤侵蚀模型,利用1990、2010、2015年的土地利用数据、1990-2015年的日降雨量、DEM等数据估算大方县的土壤侵蚀模数。在研究1995年小于容许土壤流失量(500t·m^(-2)·a^(-1))的土地面积达874km^2,占全县侵蚀总面积的50.37%,轻度侵蚀面积为497km^2,占比达28.64%,中度、强烈、极强烈和剧烈土壤侵蚀量强度较小,占土壤侵蚀量总强度的20.99%。

Soil erosion in Dafang County of Guizhou Province from 1990 to 2015 was studied to provide basis for soil and water conservation and desertification control in this area.Based on the GIS/ENVI technology and method,combined with the USLE soil erosion model,the soil erosion modulus of Dafang County was estimated based on the land use data of 1990,2010 and 2015,daily rainfall of 1990-2015 and DEM.In the study,the area of less than permissible soil loss(500t·m-2·a-1)in 1995 was 874km2,accounting for 50.37%of the total area of erosion in the county and 497km2 in light erosion area,accounting for 28.64%Degree,intense,extremely intense and violent soil erosion intensity is small,accounting for 20.99%of the total intensity of soil erosion.