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_田育新.pdf

200633 1 1 1 2 2 1 1 1 田育新 , 李锡泉 , 陶接来 , 李书明, 张灿明, 董春英 , 姚 敏 (1. , 410004; 2. , 410007) : 在人工模拟降雨强度为1.44mm/min 的条件下,研究了不同坡度( B) 红壤近似裸地坡面迳流泥沙的 化特 征,研究结果表明: ¹ 地表迳流量随坡度的增大而迅速增加º 当B [ 23b时, 土壤侵蚀量随坡度的增大而迅速增 加; 当25b [ B [ 40b时, 土壤侵蚀量随坡度 化较小» 坡面土壤侵蚀的临界坡度则介于23b~ 25b之间¼坡度与 1. 65 1.4 侵蚀量关系可用函数表示为: S = 199. 1@ L @ tan B (0b [ B [ 23b) : 人工降雨; 迳流量; 泥沙量; 坡度; 红壤 : S 157 : A : 1003) 5710(2006)01) 0001) 03 The changing characters of runoff, mud and sand in different grade red soil slope in artificial rainfall precipitation condition 1 1 2 2 TIAN u-xin , LI X-i quian , TAO Jie-lai , LI Shu-ming , 1 1 1 ZHANG Chan-ming , DONG Chun-ying , AO Min (1.Hunan Forestry Academy, Changsha 410004, China; 2. Forestry Department of Hunan Province, Changsha 410004, China) Abstract: Based on the artificial rainfall precipitation condition instrength 1. 44mm/ min, the changing characters of runoff, mud and sand in different grade( B) redsoilslopewere studied inthe experiment. The results showed that ¹ The volume of runoff was increasedwith the grade increase of slope; º With B [ 23, the erosionwas rapid increasedwith the grade increase of slope, andwith 25[ B [ 40, no obvious erosion changing with the grade of slope; » The critical grade of erosion was between 23~ 25; ¼Thefunction of glope and erosion volume is S