人工降雨条件下不同坡度红壤坡面迳流泥沙变化特征研究  

The changing characters of runoff,mud and sand in different grade red soil slope in artificial rainfall precipitation condition

作　　者：田育新[1] 李锡泉[1] 陶接来[2] 李书明[2] 张灿明[1] 董春英[1] 姚敏[1] 

机构地区：[1]湖南省林业科学院,湖南长沙410004 [2]湖南省林业厅,湖南长沙410007

出　　处：《湖南林业科技》2006年第1期1-3,共3页Hunan Forestry Science & Technology

基　　金：湖南省林业厅重点研究项目"湖南省退耕还林工程效益监测"研究内容之一

摘　　要：在人工模拟降雨强度为1．44mm／min的条件下，研究了不同坡度（β）红壤近似裸地坡面迳流、泥沙的变化特征，研究结果表明：①地表逗流量随坡度的增大而迅速增加。②当β≤23°时，土壤侵蚀量随坡度的增大而迅速增加；当25°≤β≤40°时，土壤侵蚀量随坡度变化较小。③坡面土壤侵蚀的临界坡度别介于23°～25°之间。④坡度与侵蚀量关系可用函数表示为：S=199．1×L^1.65×tan^1.4β（0°≤β≤23°）。Based on the artificial rainfall precipitation condition in strength 1.44 mm/min, the changing characters of runoff, mud and sand in different grade（β） red soil slope were studied in the experiment. The results showed that ① The volume of runoff was increased with the grade increase of slope; ② With β≤23, the erosion was rapid increased with the grade increase of slope, and with 25 ≤β≤ 40, no obvious erosion changing with the grade of slope;③ The critical grade of erosion was between 23 ～ 25; ④ The function of glope and erosion volume is S = 199.1 × L^1.65 × tan^1.4 β（0≤β≤23）.

关 键 词：人工降雨 逗流量 泥沙量 坡度 红壤 

分 类 号：S157[农业科学—土壤学]