人民长江2025，Vol.56Issue(3)：184-190,229,8.DOI:10.16232/j.cnki.1001-4179.2025.03.025
工程陡坡水蚀特征对植被密度响应的降雨试验
Rainfall experiment on response of water erosion characteristics to vegetation density on engineering steep slopes
摘要
Abstract
Project constructions significantly disrupt the surface and damage the original vegetation,potentially leading to soil e-rosion.Vegetation planting is one of the important means to restore the regional ecology disturbed by the subsequent implementa-tion of the project.Based on field investigations,simulated rainfall experiments were conducted with bare slopes as controls to ana-lyze the effects of Paspalum notatum Flugge(PF)on the runoff and sediment yielding characteristics and water-sediment bene-fits of engineering steep slopes(28°)under two vegetation densities(PF10:10 cm×10 cm,PF20:20 cm×20 cm).Results showed:① The occurrence time of PF20 surface runoff under rainfall intensities of 1.0,1.5 mm/min,and 2.0 mm/min was 61.81%,0.88%,and19.38%earlier than that of bare slopes.In contrast,PF10 delayed runoff occurrence when rainfall intensities of 1.5,2.0 mm/min,with a lag benifits of 76.61%and 237.21%.②The average runoff rate on the bare slope under three dif-ferent rainfall intensities was 3.23,4.55 times,and 1.28 times than that of PF10.At rainfall intensities of 1.0 mm/min and 1.5 mm/min,the average runoff rate on the bare slope was 1.10 times and 1.27 times than that of PF20.However,at rainfall intensity of 2.0 mm/min,the average runoff rate of PF20 reached 1.08 times than that of bare slope.When rainfall intensity reached 2.0 mm/min,the average sediment yield rate of PF20 was 1.08 times than that of the bare slope.When rainfall intensity was 1.0 mm/min and 1.5 mm/min,vegetation significantly reduced erosion on steep slopes.In contrast,at 2.0 mm/min rainfall intensity,vege-tation-induced erosion on steep slopes was greater than that on bare slope in the later stages of runoff.Overall,the average sedi-ment yield on bare slopes was 7.83,2.86,1.24 times more than that of PF20 and 23.01,6.98,3.13 times more than that of PF10.③ The average sediment reduction benefits of PF20 and PF10 were57.26%and83.11%,respectively,while the average runoff reduction benefits were 7.08%and 56.22%,respectively.The runoff and sediment reduction benefits of PF10 were 7.94 and 1.45 times than those of PF20,respectively.Variance contribution rate analysis showed that rainfall intensity contributed 7.18 times and 4.31 times than that of the vegetation density to accumulation runoff and sediment production on engineering steep slopes,but vegetation density had a higher impact on regulating sediment production compared to runoff production.These re-search results can provide scientific guidance for the vegetation ecological restoration of engineering disturbed slopes.关键词
工程陡坡/植被密度/产流产沙/减水减沙/模拟降雨Key words
engineering steep slopes/vegetation density/runoff and sediment yield/reduction of soil and runoff/simulated rainfall分类
农业科技引用本文复制引用
郭锐,张鹏,李黎,李季孝,刘海波,吴光耀..工程陡坡水蚀特征对植被密度响应的降雨试验[J].人民长江,2025,56(3):184-190,229,8.基金项目
云南省重点研发计划项目(202203AA080009) （202203AA080009）
云南省科技计划项目(202402AE090024) （202402AE090024）
