基于CSLE模型的神木市土壤侵蚀模数计算

基于GIS、RS平台,采用CSLE模型,依据全国气象站网2001—2017年日降雨数据、1∶50万神木市土壤属性空间分布图及工程措施数据、10 m分辨率DEM数据、土地利用现状和植被覆盖度数据、Landsat影像,对神木市2010、2015、2017年土壤侵蚀模数变化特征进行分析。结果表明:3期神木市土壤侵蚀模数分别为1252.5、1216.68、1976.07 t/(km²·a),呈先减少后增加的趋势;随植被覆盖度增加,3期不同植被覆盖度区域土壤侵蚀模数和侵蚀量均呈先增后减的趋势;随海拔升高,3期不同高程带内土壤侵蚀模数均呈逐渐减小的趋势;随坡度增加,3期不同坡度级别区域土壤侵蚀模数均大致呈增加的趋势;此外,暴雨是导致神木市土壤侵蚀增加的重要原因,在水土保持工作中应增加应对暴雨的措施。

Calculation of Soil Erosion Modulus in Shenmu City Based on CSLE Model

Based on the platforms of GIS and RS,using CSLE model and according to the daily rainfall data of national meteorological station network from 2001 to 2017,1∶500000 spatial distribution map of soil properties and engineering measures data in Shenmu city,DEM data with 10 m resolution,land use status and vegetation coverage data and Landsat images,the paper analyzed the variation characteristics of soil erosion modulus in 2010,2015 and 2017.The outcomes show that:a)the soil erosion modulus of phaseⅢin Shenmu city is 1252.5,1216.68 and 1976.07 t/(km 2·a)respectively,showing a trend of decreasing first and then increasing;b)along with the increase of vegetation coverage,the soil erosion modulus and soil erosion amount of different vegetation coverage areas of phaseⅢare all showed a trend of first increase and then decrease;c)along with the increase of altitude,the soil erosion modulus in different elevation zones of phaseⅢare decreased gradually;d)along with the increase of slope,the soil erosion modulus in different slope grade areas of phaseⅢshow an increasing trend roughly and;e)in addition,rainstorm is an important reason for the increase of soil erosion in Shenmu city and measures to deal with rainstorm should be added in soil and water conservation work.