Analysis of spatial and temporal evolution and dynamic driving force of soil erosion in the middle reaches of the Yellow River in the rich and coarse sendiment area
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College of Soil and Water Conservation, Beijing Forestry University

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National Key Research and Development Program (NKRDP) projects

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    Abstract:

    [Objective] To reveal the spatial and temporal evolution characteristics of soil water erosion in the middle reaches of the Yellow River in the rich and coarse sediment area from 2000 to 2020, and analyze its dynamic driving force. [Methods] Based on the RUSLE model, calculate the year-by-year soil water erosion modulus in the rich and coarse sediment area, analyze the change characteristics of soil water erosion intensity in 2000, 2005, 2010, 2015, and 2020, and explore the spatial-temporal characteristics of soil water erosion modulus by using the Sen+MK trend analysis method combined with the Hurst index, and use the factor probing in the parameter-optimal geographical detector with the interactive probing to quantify the explanatory power of six factors, namely, average annual precipitation, elevation, slope, vegetation cover, land use/cover type, and soil type, on the spatial distribution of soil water erosion. [Results]: (1) The area of moderate, intense, very intense, and intense erosion in the rich and coarse sediment area decreased by 48.09%, 77.93%, 83.01%, and 36.13%, respectively, and the area of slight and mild erosion increased by 46.22% and 0.33%, respectively, in the five-period from 2000 to 2020. At this stage, the sandy and coarse sandy area is dominated by slight and mild erosion, and the area of the two is 62.49% and 42.07% respectively. (2) The overall inter-annual change of soil water erosion modulus in the rich and coarse sediment area shows a fluctuating and significant downward trend, from 2,214.89 t/(km2·a) in 2000 to 1,169.44 t/(km2·a) in 2020, and the spatial change of soil water erosion modulus in the rich and coarse sediment area from 2000 to 2020 is mainly in a decreasing state, with an area of 76.13%, and the future area of the rich and coarse sediment area is 76.13%. The spatial change trend of soil water erosion modulus in the sandy and coarse sandy area from 2000 to 2020 is mainly in a decreasing state, with an area share of 76.13%, and the future will still be mainly in a decreasing state, with an area share of 62.50%. (3) The explanatory power of the interactions among the six factors is greater than that of a single factor, and it is mainly manifested as nonlinear enhancement and two-factor enhancement; soil water erosion in the rich and coarse sediment area is dominated by precipitation and land use/cover in 2000-2005, and is dominated by vegetation cover and land use/cover in 2010-2020. [Conclusions]: The soil water erosion condition in the rich and coarse sediment area improved continuously from 2000 to 2020; in the future, a total of 62.50% of the area soil water erosion modulus is in the state of continuous decline and future decline, but there is still a potential risk of increase in 20.44% of the area; the land use/cover pattern was changed by the project of returning farmland to forests and grassland, which made the soil water erosion in the rich and coarse sediment area The driving force of soil water erosion in the rich and coarse sediment area changes dynamically; the slope factor needs to be fully considered when optimizing the land use/cover pattern for the prevention and control of soil water erosion in the rich and coarse sediment area in the future.

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History
  • Received:July 26,2023
  • Revised:September 06,2023
  • Adopted:September 07,2023
  • Online: January 27,2024
  • Published: