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[1]QIU Anan,LUO Yao,WANG Hongya.Spatial and Temporal Changes of Soil Erosion in Small Watershed in Guizhou Karst Based on Characteristics of Reservoir Sediments and WaTEM/SEDEM Model[J].Research of Soil and Water Conservation,2019,26(01):14-21.

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Spatial and Temporal Changes of Soil Erosion in Small Watershed in Guizhou Karst Based on Characteristics of Reservoir Sediments and WaTEM/SEDEM Model

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 01 Page number: 14-21 Column: Public date: 2019-02-28

Title:: Spatial and Temporal Changes of Soil Erosion in Small Watershed in Guizhou Karst Based on Characteristics of Reservoir Sediments and WaTEM/SEDEM Model

Author(s):: QIU Anan, LUO Yao, WANG Hongya; College of Urban and Environmental Sciences, Peking University, Beijing 100871, China

Keywords:: geography; erosion modulus; WaTEM/SEDEM Model; dediments; Guizhou Karst

CLC:: S157;F301.24

DOI:: -

Abstract:: Understanding the temporal and spatial changes of soil erosion in the karst area of Guizhou Plateau is a key requirement for managing against soil erosion. A spatially distributed soil erosion and sediment delivery model (WATEM/SEDEM) was applied to investigate temporal-spatial changes in soil erosion under six scenarios during the past 30 years in Songguan Watershed. The results showed that the sediment yield simulated by using the WaTEM/SEDEM model and observed values fitted well, showing that the model had a good predictability and practicability in karst regions. The average soil erosion in Songguan watershed was 21.33 t/(hm²·a) and the intensity of soil erosion decreased firstly and then increased during the past 30 years. The major sediment source was dryland, accounting for 85.09% of the total sediment yields while the erosion in northern forestland and grassland was relatively slight. The simulated sediment yields were in good agreement with the sediment records. They both demonstrated that land use had a greater impact on soil erosion rather than rainfall. The study suggests that attention should be given to the changes of land use spatial pattern when applying soil conservation policies in karst regions.

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