Effects of soil rock fragment content on the USLE-K factor estimating and its influencing factors
作者机构：College of Urban and Environmental SciencesNorthwest UniversityXi'an710127China College of GeographyBeijing Nomal UniversityBeijing100875China The First Institute of Geoinformation MappingMinistry of Natural Resources of the People's Republic of ChinaXian710054China
出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)
年 卷 期：2023年第11卷第2期
页 面：263-275页
核心收录：
学科分类：082802[工学-农业水土工程] 090707[农学-水土保持与荒漠化防治] 0907[农学-林学] 08[工学] 0828[工学-农业工程] 09[农学] 0815[工学-水利工程]
基 金：supported by the Strategic Priority Research Program of Chinese Academy of 463 Sciences Grant No.XDA20040202
主 题：Soilerosion Soil erodibility factor Rock fragment Rock cover Environmental elements
摘 要：Rock fragments are an important component of soil,and their presence has a significant impact on soil erosion and sediment *** this paper,the effects of rock fragments in the topsoil profile(RFP)and rock fragments on the soil surface(RFS)on the soil erodibility factor(K)were assessed at a global *** spatial pattern of the relationship between stoniness and erodibility(RS-K)and its predominant factors were explored through correlation analysis,pattern analysis,and random forest model *** results were as followings:(1)The existence of RFP increased K by 2.84%.The RFS of the mountain land and desert/Gobi reduced K by 18.7%;therefore,once the RFP and RFS were taken into account in the calculation,K was 6.98%lower.(2)The predominant factors of the effect of RFS and the joint effect of RFP and RFS were elevation and slope *** predominant factors of the effect of RFP were annual average precipitation and annual average temperature.(3)In assessing and mapping soil erosion in large regions,special attention should be given to areas with large rock fragment contents,a relatively high altitude,and the presence of steep *** rock fragments were not taken into consideration,the mapping results of soil erosion may be *** article made the calculation of K more complete and accurate,thereby improving the accuracy of regional soil erosion *** research was of sig-nificance for the investigation of global hydrological effects and simulation of the global soil carbon budget.
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