【摘要】 为研究天然降雨条件下坡面土壤剥蚀率及其与水流含沙量的关系,通过在野外15°径流小区分多层多区段同时布设不同稀土元素进行连续天然降雨试验。结果表明:距坡顶4 m坡段内的土壤剥蚀率在首次产流初期相对较大;随着坡面下部细沟的出现,距坡脚2 m的坡段内,水流剥蚀逐渐以细沟流剥蚀为主,土壤剥蚀率在整个坡面内最大;坡面各段土壤剥蚀率的变化过程同降雨强度的变化趋势基本一致;在次降雨过程及全年的降雨中坡面各段土壤剥蚀率随水流含沙量的增加呈幂函数递增。更多还原

【Abstract】 In order to study on soil detachment rate and relationship between detachment rate and flow sediment,the experiment under natural rainfall was applied by placing different rare earth oxide in different soil depth and different section across a slope in the field plot with 15 degree.The results indicated that the detachment rate in the section from the upper part slope of 4 m was relatively large in the early of the first runoff.Detachment rate in rills was gradually mainly in the 2 m away from the foot of the slope with the emergence of rill,and the detachment rate was the largest across the slope.The change trends of detachment rate were basically the same with rainfall intensity.During each rainfall and all year rainfall,the soil detachment rate in each section of slope increased along with flow sediment load increasing,and power function relation was listed between them.更多还原