Effects of vegetation cover and configuration on soil wind erosion based on wind tunnel experiments
Soil wind erosion is a serious environmental problem in northern China,and vegetation can effective-ly control soil wind erosion.In order to provide a basis for the design of soil wind erosion control program,this experiment was carried out in the southern margin of Mu Us Sandy Land with Leymus chinensis"Zhongke No.l"as the object.The effects of vegetation coverage(10％,20％,30％and 40％)and configuration mode(one-row-and-one-belt,two-row-and-one-belt,and cross-distributed)on the structure of wind-drift sand and the amount of wind erosion were studied.The results showed that:(1)The sediment transport intensity of each layer increases with the increase of wind speed and decreases with increasing coverage.The rate of sand transport conforms to an exponential function with coverage.The"elephant's trunk effect"appears in the structure of wind-blown sand flow.The increase of wind speed and coverage makes the height level of the peak intensity of sand transport move upward.(2)The variation of sediment transport intensity along vertical height is an exponential function distribution,and the sediment inhibition effect of two-row-and-one-line and cross-distribution is greater than that of one-row-and-one-belt.(3)From the perspective of optimal sand fixation efficiency and economic benefits,Leymus chinensis"Zhongke No.l"should be planted with a coverage of about 30％,and areas with higher wind speeds use a cross-distribution configuration.
NETL
NSTL
万方数据
维普
