Soil loss and sedimentation rates in a subcatchment of the Yellow river Basin in China  

作　　者：Simon Scheper Chunyue Liu Zhongbao Xin Lishan Ran Christine Alewell 

机构地区：[1]Environmental Geosciences,University of Basel,CH-4056,Basel,Switzerland [2]Dr.Simon Scheper-Research|Consulting|Teaching,DE-29413,Dahre,Germany [3]School of Soil and Water Conservation,Beijing Forestry University,Beijing,100083,China [4]Department of Geography,The University of Hong Kong,Pokfulam,Hong Kong

出　　处：《International Soil and Water Conservation Research》2024年第3期534-547,共14页国际水土保持研究（英文）

摘　　要：Soil loss by water erosion is one of the main threats to soil health and food production in intensively used agricultural areas.To assess its significance to overall sediment production,we applied the Water and Tillage Erosion Model/Sediment Delivery model(WaTEM/SEDEM)to the Luoyugou catchment,a sub-catchment of the Yellow River Basin within the Chinese Loess Plateau.WaTEM/SEDEM considers rill and interrill erosion and deposition rates to calculate the sediment yield rates leaving the catchment.Ter-races were established in the 1990s to reduce soil loss in this area,but no soil erosion modeling has been published regarding the effect of this mitigation measure.Therefore,we applied 1000 Monte Carlo simulations of the WaTEM/SEDEM,and the modeled average soil loss by rill and interrill erosion for 2020 was 12.2±0.5 t ha^(-1)yr^(-1),with a sediment yield at the outlet of 53,207.8±11,244.1 t yr^(-1).The results indicated that the terracing reduced gross soil loss rates(from 51.8t ha^(-1)yr^(-1)in 1986 to 12.2±0.5 t ha^(-1)yr^(-1)in 2020),while land cover changes,mainly the conversion of forests and grassland,partly coun-teracted the mitigation(combined effect:76%reduction).Modeled sediment loads by rill and interrill erosion accounted for 22.8%of the total long-term sediment production recorded by flow discharge measurements.Other processes not considered by the model,such as landslides,gully erosion,riverbank erosion,and sediment production by construction,seem to predominantly influence the overall sedi-ment yield.Considering years with baseline sediment production only,the measured and modeled sediment yields compared favorably,indicating that the latter processes primarily contribute during extreme events.

关 键 词：WaTEM/SEDEM Erosion modeling Soil erosion rates Sediment load Risk assessment TERRACES 

分 类 号：S157[农业科学—土壤学]