Elevation,bedrock exposure,land use,interbedded limestone and clastic rock,and vegetation coverage dominate the spatiotemporal variability of soil erosion in karst basin  

作　　者：CHEN Mei GAO Jia-yong CHEN Hong-lian JING Jun LI Rui 

机构地区：[1]School of Karst Science,Guizhou Normal University,Guiyang 550001,China [2]State Engineering Technology Institute for Karst Desertification Control,Guiyang 550001,China

出　　处：《Journal of Mountain Science》2023年第9期2519-2535,共17页山地科学学报（英文）

基　　金：supported by National Natural Science Foundation of China(32060372,32360421);Guizhou Science and Technology Department(Qian Ke He Ji Chu ZK-[2023]Key 029;Qiankehe Zhicheng[2021]Yiban462)。

摘　　要：Soil erosion is a prominent environmental problem in karst regions.Exploring the spatiotemporal variability of soil erosion and the factors that influence soil erosion is of great significance for regional soil erosion prevention and control.However,the mechanisms influencing the characteristic features of the karst basins,such as bedrock exposure and lithology,still need to be further explored.This study used GIS technology,the Revised Universal Soil Loss Equation model,Getis–Ord Gi*,and partial least squares regression(PLSR)to identify the dominant factors influencing soil erosion and the spatiotemporal variability of soil erosion in 31 sub-basins of the Dabang River Basin(DRB),a typical karst area of Southwest China,from 2010 to 2020.The results indicated that soil erosion in the DRB from 2010 to 2020 was generally decreasing,the mean soil erosion in the DRB in 2010,2015 and 2020 was 18.46,16.51 and 15.29 t ha^(-1)a^(-1),respectively.During the study period,the area of slight erosion increased by 26.39%(706.54 km^(2)),while severe erosion enlarged by 26.36 km^(2).Spatially,the DRB was primarily affected by medium and slight soil erosion.The hot spot areas of soil erosion(key control areas)were mainly concentrated in the central and southern parts of the basin,decreasing each year,and the area of soil erosion hot pots has decreased from 43.22%to 20.60%.PLSR decoupling results show that elevation,bedrock exposure,land use type,interbedded limestone and clastic rock,and vegetation coverage were identified as the key variables affecting soil erosion,explaining 52.8%of soil erosion variability,with a high value of the Variable Importance on Projection(VIP)more than 1.These results can be used as a reference for comprehensive control of soil erosion and water loss in the basin.

关 键 词：Soil erosion Karst basin RUSLE model Spatiotemporal variability PLSR 

分 类 号：S157.1[农业科学—土壤学]