Soil erosion differences in paired grassland and forestland catchments on the Chinese Loess Plateau  

作　　者：YANG Si-qi LUO Da HAN Hao JIN Zhao 

机构地区：[1]Interdisciplinary Research Center of Earth Science Frontier,State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China [2]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]College of Geology Engineering and Geomatics,Chang'an University,Xi'an 710054,China [5]National Observation and Research Station of Earth Critical Zone on the Loess Plateau of Shaanxi,Xi’an 710061,China

出　　处：《Journal of Mountain Science》2023年第5期1336-1348,共13页山地科学学报（英文）

基　　金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB40000000);the National Natural Science Foundation of China(Grant No.41790444)。

摘　　要：In this study,two adjacent gauged catchments on the Chinese Loess Plateau were selected,in which one catchment was afforested and one was restored with natural vegetation in 1954.The distributions of soil erosion rates were estimated between 2010 and 2020 with a high spatial resolution of 2 m in the paired catchments based on the Revised Universal Soil Loss Equation model(RUSLE)and Geographic Information Systems(GIS).The results showed that the simulated soil erosion rates in 2010-2020 averaged 12.58 and 8.56 t ha^(-1)a^(-1)for the grassland and forestland catchment,respectively.Moreover,areas with high soil erosion rates(>80t ha^(-1)a^(-1))were mainly distributed in the topography with steep slope gradients(>45°).Comparisons between simulated soil erosion rates and observed annual sediment loads indicated that the simulation results of the grassland catchment were lower than the observed values,while it was reversed in the forestland catchment.We conclude that the RUSLE model cannot simulate the gravity erosion induced by extreme rainfall events.For the forestland catchment,insufficient streamflow and dense vegetation coverage are crucial factors resulting in hindering the movement of sediments.

关 键 词：Catchment comparison Soil erosion RUSLE model Vegetation effect Topography effect Spatial analysis 

分 类 号：S157.1[农业科学—土壤学]