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[1]CHEN Chenchen,WU Qian,ZHANG Zhanyou,et al.Spatiotemporal Change of Soil Erosion in the Middle and Lower Reaches of Lancangjiang River[J].Research of Soil and Water Conservation,2022,29(02):11-17+30.

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Spatiotemporal Change of Soil Erosion in the Middle and Lower Reaches of Lancangjiang River

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 02 Page number: 11-17+30 Column: Public date: 2022-03-20

Title:: Spatiotemporal Change of Soil Erosion in the Middle and Lower Reaches of Lancangjiang River

Author(s):: CHEN Chenchen^1,2, WU Qian³, ZHANG Zhanyou³, DONG Wei², CHENG Yao^1,2, WANG Jin⁴; (1.Hebei Key Laboratory of Intelligent Water Conservancy, Hebei University of Engineering, Handan, Hebei 056038, China; 2.School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan, Hebei 056038, China; 3.Handan Zhangfu River Irrigation and Water Supply Management Office, Handan, Hebei 056001, China; 4.Beijing Aqua Intelligent Technology Co., Ltd., Beijing 100070, China)

Keywords:: Lancangjiang River; middle and lower reaches; RUSLE; soil erosion; random forest; influence factor

CLC:: S157.1

DOI:: -

Abstract:: In order to explore the evolution mechanism of soil erosion, the middle and lower reaches of Lancangjiang River was taken as the study area, the temporal and spatial evolution characteristics of soil erosion were studied by the improved RUSLE model, the relative importance of soil erosion factors was discussed by random forest(RF)algorithms. The results show that the soil erosion in the middle and lower reaches of Lancangjiang River from 2005 to 2015 ranged from 0 to 1.89×10⁴ t/(km²·a), the average soil erosion modulus was 2.52×10³ t/(km²·a); the average soil erosion moduli in the middle and lower reaches sub-basins were between the low risk and medium risk. Since 2005, the spatial distribution characteristics of soil erosion in the middle and lower reaches of Lancangjiang River showed an expanding trend in moderate erosion risk area, and shrinking trend in high and low erosion risk areas. The results of random forest algorithms indicated that cropping management factor and topography factor were the main factors affecting soil and water losses in the middle and lower reaches of Lancangjiang River, while the relative importance of soil erodibility factor, rainfall erosivity factor and support practice factor were low, all of which were less than 20%. The spatiotemporal heterogeneity of soil erosion is mainly due to the local climate changes caused by vegetation cover and topography.

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Last Update: 2022-04-20