1.School of Water and Environment,Chang’an University,Xi’an,Shaanxi 710054,China
2.Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education,Chang’an University,Xi’an,Shaanxi 710054,China
3.Key Laboratory of Eco-hydrology and Water;Security in Arid and Semi-arid Regions of Ministry of Water Resources,Chang’an University,Xi’an,Shaanxi ;710054,China
4.Shaanxi G&M Natural Resources Investment Construction Co. ,Ltd. ,Xi’an,Shaanxi 710054,China
5.Huijin Technology Holding Group Corporation Limited,Xi’an,Shaanxi 710000,China
6.Gansu Provincial;Water Conservancy and Hydropower Survey and Design Research Institute Co. ,Ltd. ,Lanzhou,Gansu 730030,China
Ma Cheng. The slope erosion characteristics and effective vegetation coverage in the vulnerable ecological regions in the Shaanxi section of the Yellow River basin [D]. Xi’an, Shaanxi: Chang’an University, 2024.
Objective The erosion patterns of sandy slopes in ecologically fragile areas of the Shaanxi section of the Yellow River basin were investigated, and the effective vegetation coverage levels for erosion control on sandy slopes are determined, in order to provide theoretical reference and data support for mine ecological restoration and soil and water conservation. Methods A combination of field investigation, in-situ monitoring, and numerical simulation was adopted. 12 large areas and 48 field runoff plots with three slope gradients, four slope lengths, and three vegetation conditions were established at Shendong sand site, Hechuan Town, Heyang County, Weinan City, Shaanxi Province. A water erosion prediction project (WEPP) model for sandy slope soils in the study area was constructed, and the erosion patterns of sandy slopes were simulated. The effective vegetation coverage level for erosion control of sandy slopes was determined based on the abrupt change in the increment of sediment yield reduction coefficient (∆Er ). Results ① Based on field in-situ monitoring data, a WEPP model for soil erosion on sandy slopes in the study area was constructed, and model parameters were calibrated to obtain the relevant parameters. ② Based on the constructed WEPP model and the obtained parameters, simulation results showed that there was a critical precipitation intensity (CPI), which varied under different precipitation conditions, slope gradients, and slope lengths. When precipitation intensity exceeded the critical precipitation intensity, the order of runoff and sediment yield of sandy slopes under the same precipitation intensity followed daily precipitation amount of 70 mm > 50 mm > 30 mm. The order of runoff was 25° > 15° > 35° for slope gradients, and 24.4 m > 12.2 m > 30.0 m for slope lengths. The order of sediment yield was 35° > 25° > 15° for slope gradients. If the maximum precipitation intensity(PImax) < 45 mm/h, the order was 24.4 m > 30.0 m > 12.2 m for slope length. If PImax > 45 mm/h, the order was 30.0 m > 24.4 m > 12.2 m. ③ Based on ‘∆Er ’ with 10%, the numerical simulation results showed that the effective vegetation coverage for erosion control on sandy slopes was 20%—30% when the slope gradient was 15° and 25°, and 30%—40% when the slope gradient was 35°. Conclusion Sandy slope erosion in the Shaanxi section of the Yellow River basin has a critical precipitation intensity. Different slope gradients, slope lengths, precipitation, and vegetation coverage have different erosion patterns. The effective vegetation coverage for erosion control on sandy slopes with gradients of 15°, 25°, and 35° is 20%—30%, 20%—30%, and 30%—40%, respectively.
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李雨婷,杨泽元,史文海,贺娟妮,王周锋,马成,于金乐.
黄河流域陕西段脆弱生态区砂质坡面侵蚀控制的有效植被盖度[J].
水土保持通报, 2026, 46(03): 277-289 DOI:10.13961/j.cnki.stbctb.2026.03.035
文献参数: 李雨婷, 杨泽元, 史文海, 等.黄河流域陕西段脆弱生态区砂质坡面侵蚀控制的有效植被盖度[J].水土保持通报,2026,46(3):277-289. Citation:Li Yuting, Yang Zeyuan, Shi Wenhai, et al. Effective vegetation coverage of sandy slopes to control erosion in fragile ecological zone of Shaanxi section of Yellow River basin [J]. Bulletin of Soil and Water Conservation,2026,46(3):277-289.
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