基于CSLE模型的神木市土壤侵蚀模数计算

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

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/(km^(2)·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。

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.