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[1]Zhu Miyuan,Wu Xiaofei,Li Chenhui,et al.Effects of Different Vegetation Types and Restoration Processes on Runoff and Sediment on Steep Slopes of the Loess Plateau[J].Research of Soil and Water Conservation,2023,30(06):57-66.[doi:10.13869/j.cnki.rswc.2023.06.002]

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Effects of Different Vegetation Types and Restoration Processes on Runoff and Sediment on Steep Slopes of the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 06 Page number: 57-66 Column: Public date: 2023-10-10

Title:: Effects of Different Vegetation Types and Restoration Processes on Runoff and Sediment on Steep Slopes of the Loess Plateau

Author(s):: Zhu Miyuan^1,2, Wu Xiaofei^1,2, Li Chenhui^1,2, Guo Tianqi^1,2, Zhang Rui^1,2, Huang Mingbin²; (1.College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: vegetation restoration; vegetation types; surface runoff; soil erosion; leaf area index

CLC:: S157.2; P333

DOI:: 10.13869/j.cnki.rswc.2023.06.002

Abstract:: [Objective] The aim of this study is to explore the impacts of different vegetation types and restoration processes on soil and water loss on steep slopes, to find the vegetation types that can better control soil and water loss on steep slopes, and then to provide theoretical guidance. [Methods] Based on the long-term observation data of rainfall, LAI(leaf area index), surface runoff and soil erosion in 9 runoff plots from 2008 to 2021, conducted in the Wangdonggou watershed of the Loess Plateau, the changes of surface runoff and soil erosion with vegetation restoration in different vegetation types were studied using one-way ANOVA method and linear regression method. [Results] There were significant differences in the impacts of different vegetation types on reducing runoff and sediment on steep slopes. The annual average surface runoff and soil erosion modulus under Platycladus orientalis were significantly higher than those of other vegetation types(p<0.05), without significant differences among the other 8 vegetation types(p>0.05). The average annual runoff and erosion modulus under Bothriochloa ischaemum and Hippophae rhamnoides were at a low level. With the restoration of vegetation, the LAI of each vegetation type increased gradually, the surface runoff and soil loss decreased significantly, and the declining trends of different vegetation types were different. Comparatively, the decreasing rates of surface runoff and soil loss under Platycladus orientalis were significantly greater than those under other vegetation types(p<0.05). In 2021, the surface runoff and soil erosion modulus under Bothriochloa ischaemum, Hippophae rhamnoides, Hippophae rhamnoides×Robinia pseudoacacia and Robinia pseudoacacia were lower than those under other vegetation types. The surface runoff and soil erosion modulus of each vegetation type were linearly related(p<0.01), and the coefficient of the linear function represented the soil loss per unit of surface runoff, reflected the ability of vegetation to control soil erosion. [Conclusion] Among the 9 vegetation types, the impact of Bothriochloa ischaemum was the largest. The vegetation restoration measures in grasses, shrubs and mixed forests were better to reduce soil erosion on steep slopes of the Loess Plateau than pure arbor forests.

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Last Update: 2023-10-10