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[1]Wang Chenyang,Dai Quanhou,Gan Xianmin,et al.Study on the Impact of Herbaceous Morphological Changes on Runoff Generation in Karst Rocky Desertification Slopes Based on Water Erosion Experiments[J].Research of Soil and Water Conservation,2024,31(06):22-28.[doi:10.13869/j.cnki.rswc.2024.06.039]

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Study on the Impact of Herbaceous Morphological Changes on Runoff Generation in Karst Rocky Desertification Slopes Based on Water Erosion Experiments

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 06 Page number: 22-28 Column: Public date: 2024-12-10

Title:: Study on the Impact of Herbaceous Morphological Changes on Runoff Generation in Karst Rocky Desertification Slopes Based on Water Erosion Experiments

Author(s):: Wang Chenyang^1,2, Dai Quanhou^1,2, Gan Xianmin^1,2, Xu Xiaojin^1,2, Zhou Hong^1,2, Zhang Xinyin^1,2; (1.College of Forestry, Guizhou University, Guiyang 550025, China; 2.Institute of Soil Erosion and Ecological Restoration, Guizhou University, Guiyang 550025, China)

Keywords:: karst rocky desertification; runoff process; herbaceous vegetation; erosion experiments

CLC:: S157

DOI:: 10.13869/j.cnki.rswc.2024.06.039

Abstract:: [Objective]The aims of this study are to investigate the impact of herbaceous morphology changes on the spatiotemporal transformation of slope runoff under different slope conditions in karstified areas, and to provide theoretical support for soil and water conservation in these regions. [Methods]A flume experiment was conducted to simulate karst slope cultivated land, setting up three post-senescent herbaceous cover scenarios: whole-plant slope, root-only slope, and bare slope, across three gradients(5°, 15°, and 25°). With a subsurface fissure density of 0.5% and a scouring flow rate of 6 L/min, the effects of herbaceous morphology changes on runoff production in karst slopes were explored. [Results]The whole-plant morphology was found to be the most effective herbaceous state for delaying the initiation of runoff on slope. As the gradient increased to 25°, the influence of herbaceous morphology on the initial runoff timing became non-significant. Bare slopes exhibited the highest average surface runoff modulus, while the runoff processes on whole-plant slopes were the most complex and had the most significant impact on fissure flow. Slope was identified as a key factor in the distribution of slope runoff, and whole-plant morphology could still affect the distribution of slope runoff at a fixed gradient, with the potential to alter runoff distribution by up to 15%. [Conclusion]Whole-plant slopes effectively disperse runoff, reduce surface runoff, and decrease erosion risk. Root-only slopes increase runoff infiltration, thereby reducing erosion risk on the slope.

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Last Update: 2024-12-10