摘要
采用模拟降雨试验,研究了自由下渗(free drainage)、土壤水分饱和(saturation)、壤中流(seepage) 3种近地面水文条件下紫色土坡面土壤侵蚀过程。结果表明,近地表水文条件会对紫色土坡面侵蚀过程产生重要影响。在地面坡度5°~15°条件下,当地表水文条件由自由下渗演变为土壤水分饱和时,坡面侵蚀量由1.31~2.02 g/(min·m^2)增加到1.83~5.50 g/(min·m^2);当地表水文条件由土壤水分饱和变为壤中流时,坡面侵蚀量达到4.40~16.41 g/(min·m^2)。土壤水分饱和条件下坡面侵蚀量是自由下渗的1.40~2.73倍;壤中流条件下坡面侵蚀量是自由下渗时的3.36~8.12倍,是土壤水分饱和时的2.40~2.98倍。同时,坡面坡度对紫色土坡面侵蚀过程有重要的影响。
Soil erosion processes on hillslopes of purple soil under three near-surface hydrological conditions of free drainage, saturation and seepage were studied by stimulated rainfall experiments. Results showed that near-surface hydrological conditions greatly affecting soil erosion processes on hillslopes of purple soil. At slope gradients from 5° to 15°, erosion rate from hillslopes shifted from 1.31-2.02 g/(min ·m^2) under free drainage to 1. 83-5. 50 g/(min ·m^2) under saturation condition; under seepage condition, erosion rate reached to 4.40-16.41 g/(min ·m^2). Erosion rate under saturation condition was 1.40-2.7.3 times greater than that under free drainage; erosion rate under seepage condition was 3.36-812 times greater than that under free drainage and was 2.40-2.98 times higher than that under saturation condition. Meanwhile, slope gradient had a great impact on purple soil erosion processes.
出处
《水土保持通报》
CSCD
北大核心
2007年第6期9-11,79,共4页
Bulletin of Soil and Water Conservation
基金
国家重点基础研究发展计划973项目(2007CB407201)
国家自然科学基金重点项目(40335050)
西北农林科技大学创新团队建设计划(01140202)