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[1]MA Yue,HE Hongming,ZHAO Hongfei.Spatiotemporal Change of Soil Erosion in Gannan Tibetan Autonomous Prefecture Based on GIS and RUSLE[J].Research of Soil and Water Conservation,2023,30(03):37-46.[doi:10.13869/j.cnki.rswc.2023.03.023]

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Spatiotemporal Change of Soil Erosion in Gannan Tibetan Autonomous Prefecture Based on GIS and RUSLE

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 37-46 Column: Public date: 2023-04-10

Title:: Spatiotemporal Change of Soil Erosion in Gannan Tibetan Autonomous Prefecture Based on GIS and RUSLE

Author(s):: MA Yue¹, HE Hongming^1,2, ZHAO Hongfei¹; (1.State Key Laboratory of Soil Erosion and Dryland Framing on the Loess Plateau, North A&F University, Yangling, Shaanxi 712100, China; 2.Institute of Soil and Water Conservation, Chinese Academy of Science and ministry of Water Resources, Yangling, Shaanxi 712100, China)

Keywords:: soil erosion; RULSE model; GIS analysis; Geographical Detector

CLC:: S157.1

DOI:: 10.13869/j.cnki.rswc.2023.03.023

Abstract:: [Objective]Exploring the erosion problem caused by grassland degradation in Gannan Prefecture can help understand the local soil and water losses, which is conducive to the construction of ecological security barrier on the Qinghai-Tibet Plateau. [Methods] This study revealed the temporal and spatial changes of soil erosion in Gannan Prefecture in 2000, 2010 and 2019 based on the RUSLE model, and analyzed the erosion factors of Gannan Prefecture through geographical detector. [Results] The overall degree of erosion in Gannan Prefecture is relatively light, mainly with slight erosion and mild erosion. The areas with strong, extremely strong and severe erosion in Gannan Prefecture are relatively small, but the areas and intensities of these types of erosion show the increasing trend with time. The spatial difference of soil erosion in Gannan Prefecture is obvious, and the soil erosion intensity in the western region is lower than that in the eastern region. The distributions of moderate, strong, very strong, and severe erosion areas are similar, showing a relatively obvious aggregation state. Zhuoni County, Diebu County and Zhouqu County show higher erosion risk than other counties. The erosion grade of 87.14% of Gannan Prefecture did not change from 2000 to 2019, and the transferred areas were mainly mild erosion and mild erosion areas. The areas with increased erosion levels have a higher proportion of area than areas with decreased erosion levels, which mainly distribute in Maqu County, Luqu County, Xiahe County, Zhuoni County and Diebu County. Landuse and topographic undulation are the main factors affecting ecological vulnerability in Gannan Prefecture. The project of returning farmland to forest(grass), agricultural and animal husbandry activities, the advancement of urbanization, and the complex topography of Gannan Prefecture all have the greater impacts on erosion. There is enhancement when landuse acting with population density, slope, elevation, average annual rainfall and vegetation coverage. [Conclusion] The overall erosion in Gannan Prefecture is light, but the local erosion is strong and shows an increasing trend with time. Land use change and topographic factors have the great impacts on the erosion. In the future, more attention should be paid to land use change and grassland degradation, do a good job of protection and restoration should be strengthened, and the erosion deterioration risk in ecological risk areas with complex topography should be be concerned in Gannan Prefecture.

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Last Update: 2023-04-10