Effects of Vetiveria Zizanioides Hedgerow on the Erosion Distribution of Slope Land in the Three Gorges Reservoir Area
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S157.1

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    Abstract:

    In order to reveal the influence of hedgerow on the erosion distribution of sloping land, the slope was divided into five sections (from top to bottom) by using rare earth element oxides, and the simulated rainfall experiments were conducted at one slope gradient (15°), three rainfall intensities (60, 90 and 120 mm/h) and three slope conditions (CK-control slope, P-hedgerow and R-only hedgerow root). The results showed that with the increase of rainfall intensity, the erosion rate and erosion amount of the tracer slope sections in each slope condition increased, and the overall trend was CK>R>P. The hedgerow could significantly reduce the erosion rate and its erosion amount in all parts of the slope, and the erosion sand production was mainly concentrated in the three tracer areas of Ce, La and Yb in the middle of the slope. Compared with CK slope condition, the average contribution rate of Sm and Ce tracer slope sections to total erosion decreased by 77.15%, 90.38% and 30.01%, 28.35% under R and P slope conditions, respectively, while the average contribution rate of Yb, La and Eu tracer slope sections to total erosion increased by 54.34%, 35.39% and 12.39%, 40.58% and 101.45%, 91.31%, respectively. The results indicated that hedgerow caused a decrease in erosion contribution from the lower part of the slope and an increase in erosion contribution from the middle and upper parts of the slope, which had a significant effect on the spatial distribution of slope erosion by shifting the overall erosion site upward.

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History
  • Received:November 28,2022
  • Revised:
  • Adopted:
  • Online: July 21,2023
  • Published: August 28,2023
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