[1]HE Weipeng,HU Xiasong,LIU Changyi,et al.Effects of Different Plants on Runoff and Sediment Yield and Shear Strength of Loess Slope[J].Research of Soil and Water Conservation,2023,30(04):18-26.[doi:10.13869/j.cnki.rswc.2023.04.046.]
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Effects of Different Plants on Runoff and Sediment Yield and Shear Strength of Loess Slope
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 04
Page number:
18-26
Column:
Public date:
2023-06-10
- Title:
- Effects of Different Plants on Runoff and Sediment Yield and Shear Strength of Loess Slope
- Keywords:
- loess region; cold and arid environment; plant slope; runoff and sediment yield; shear strength; root-soil composite system
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2023.04.046.
- Abstract:
- [Objective] The impact of different herbaceous species on sediment yields and shear strength of loess slope was investigated in order to provide theoretical basis and practical guidance for the further development of effective prevention and control of geological disasters such as soil erosion and shallow landslides caused by rainfall in alpine arid and semi-arid areas. [Methods] The Changlinggou Catchment located in Xining Basin was selected as the testing area, three indigenous predominant herbs(Elymus nutans, Elymus sibiricus and Agropyron trachycaulum)were taken as the testing species and artificial rainfall was conducted to quantify the impact of slope types and herb types on the yield rate of sediment and runoff, and the rooted soils of the vegetated slopes were sampled to compare the impact of precipitation on the shear strength of slope soil. [Results] Under artificial rainfall, herbaceous plants significantly reduced in productions of runoff and sediments on the slope. Compared with straight slope, terraced slope significantly reduced runoff and sediment production on the slope. With the increase of herbaceous growth period, runoff and sediment productions on the slope decreased significantly. Among them, the cumulative sediment yield of the terraced slope of E. nutans with 2-years growing period decreased by 79.68% compared with the straight slope, and the average sediment yield of the terraced slope of E. nutans with 1-year decreased by 86.27% compared with the terraced bare slope, indicating their excellent capacities for refraining the yields of sediments and runoff in terraced slopes. Moreover, the mean moisture content in slope soil increased under rainfall situation, which led to a decrease of soil cohesion. Compared with the straight slope, cohesion of terraced slope exhibited a slight decrease, especially in E. nutans terraced slope, which decreased by 19.25%, indicating its excellence in increasing soil cohesion. [Conclusion] E. nutans terraced slope can effectively inhibit soil and water losses and enhance the shear strength of shallow soil, so as to improve the stability of the slope.
- References:
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Last Update:
2023-06-10