雨强和植被覆盖度对典型坡面产流产沙的影响  

Impacts of rainfall intensity and grass coverage on runoff and sediment yield on typical slopingl land

作　　者：张旭昇[1] 薛天柱[1] 马灿[1] 魏国孝[1] 闫业庆[1] 胡雅杰[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,兰州730000

出　　处：《干旱区资源与环境》2012年第6期66-70,共5页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金创新群体项目(40721061)资助

摘　　要：应用先进的UGT水蚀测量仪,研究黄土高原祖厉河流域雨强和植被覆盖度对典型坡面产流产沙的影响。结果表明:黄土高原半干旱区间隔为15min的产流量、径流含沙量和产沙量与15min雨强具有相同的增减趋势,呈三次曲线关系y=b0+b1x+b2x2+b3x3。7种雨强条件下,人类扰动撂荒地的产流量、径流含沙量和产沙量均明显大于植被自然恢复的撂荒地,覆盖度20%的撂荒地是覆盖度35%撂荒地的平均径流系数的2.35倍,径流含沙量的4.48倍,产沙量的14.06倍。相对于受到扰动的撂荒地,植被自然恢复的撂荒地水土保持效益显著。Based on advanced UGT erosion meter, the impacts of rainfall intensity and grass coverage on runoff and sediment yield on typical sloping land in Zuli fiver basin of the Loess Plateau were investigated. The results show that there are similar changing trends （Y=b0＋bl＋b2x^2＋b3x^3 ） between 15rain rainfall intensity and runoff,sediment concentration,and sediment yield respectively in semiarid region of the Loess Plateau. Under the same rainfall intensity of 15rain,the runoff, sediment concentration and sediment yield of abandoned land with human disturbance are significantly larger than that of abandoned land with natural recovery. The runoff, sediment concentration anb sediment yield of the land with grass coverage（20% ） are 2.35,4.48,14.06 times of the corresponding parameters for the land with grass coverage（35% ）. Compared with the abandoned land with human distribution, the land with natural recovery shows much better capacity for soil and water conservation.

关 键 词：黄土高原 雨强 植被覆盖度 产流 产沙 

分 类 号：P951[天文地球—自然地理学]