[1]YU Enxu,ZHANG Mingfang,JIANG Zhiwei,et al.Spatiotemporal Dynamics of Soil Erosion and Associated Influencing Factors in the Upper Minjiang River Watershed[J].Research of Soil and Water Conservation,2023,30(01):1-10,17.[doi:10.13869/j.cnki.rswc.2023.01.003]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 01
Page number:
1-10,17
Column:
Public date:
2023-01-10
- Title:
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Spatiotemporal Dynamics of Soil Erosion and Associated Influencing Factors in the Upper Minjiang River Watershed
- Author(s):
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YU Enxu1, ZHANG Mingfang1,2, JIANG Zhiwei1, XU Yali1, DENG Shiyu1
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(1.School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu 611731, China; 2.Yangtze Delta Region Institute(Huzhou), University of Electronic Science and Technology of China, Huzhou, Zhejiang 313001, China)
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- Keywords:
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upper Minjiang River watershed; soil erosion; dynamic evaluation; spatiotemporal characteristics; vegetation change
- CLC:
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S157
- DOI:
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10.13869/j.cnki.rswc.2023.01.003
- Abstract:
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The Universal Soil Loss Equation(USLE), statistical and partial correlation analysis were used to examine the spatiotemporal evolution and causes of soil erosion in the upper Minjiang River watershed from 2001 to 2017 in order to understand the dynamic change of soil erosion in this region. The results showed that:(1)soil erosion mainly occurred in the west, southwest, northeast, and southeast of the study area;(2)the areas with significant decrease of soil erosion mainly distributed in forestlands and the areas with the elevation from 2 500~5 000 m, slope gradient greater than 15° and annual precipitation of 800~1 200 mm in the west and southwest; the areas with significant increase of soil erosion mainly distributed in the north and southeast of the study area;(3)soil erosion was positively correlated with altitude, slope gradient, annual precipitation, and vegetation types(p< 0.05);(4)the soil erosion mostly distributed in undeveloped land, grassland, and woodland, and the erosion rates(the proportion of area of erosion classified as mild and above to each land use type)were 87.11%, 39.75%, and 9.49%, respectively;(5)the contributions of soil erosion intensities of or sparse woodland, coniferous forest, mixed forest, and broad-leaved forest to total erosion intensity were 15.04%, 13.50%, 4.41%, and 0.97% respectively; soil erosion in woodland was mainly affected by precipitation and vegetation coverage while that in shrub and grassland was mainly affected by precipitation. In conclusion, the soil erosion in the upper Minjiang River watershed had the distinct spatial and temporal variation, which was mainly determined by precipitation, topography and vegetation type. These findings can benefit the design of soil erosion control practices to protect natural environment in the upper Minjiang River watershed according to graphic and vegetation types.