In order to restore the vegetation on the slope of Lan-Yong highway and to expolre the effect of vegetation on slope protection,the artificial rainfall experiment was carried out in the project area-K35+495~K35+768 (latitude and longitude:103.1906704 E,35.997268 N).The artificial rainfall was carried out on five types of vegetation(Ammopiptanthus mongolicus,Amorpha fruticosa,Haloxylon ammodendron,Hedysarum scoparium and Tamarix chinensis),and the impact of different rainfall intensities(0.5 mm/min,1 mm/min and 2 mm/min) on time of runoff,runoff,average infiltration rate and runoff conversion rate were studied.The results showed that (1) Ammopiptanthus mongolicus and Amorpha fruticosa had no significant difference on time of runoff,runoff,average infiltration rate and runoff conversion rate.In the process of artificial rainfall,the time of runoff was significantly delayed,and the runoff was cut,besides with that runoff conversion rate was reduced.Especially when the rainfall intensity was 1.0mm/min,the effect was significant.For which,the time of runoff was increased by 84.7% and 118.6%,runoff was decreased by 25.8% and 29%,and the runoff conversion rate was decreased by 8.1% and 12.1%,respectively.(2) For Haloxylon ammodendron and Tamarix chinensis in the same rainfall intensity,the time of runoff and average infiltration rate and runoff conversion rate had no significant difference so that they can be substituted by each other.Infiltration of slope soil was significantly improved by Haloxylon ammodendron and Tamarix chinensis.The average infiltration rate was increased by 52.8% and 43.4% when the rainfall intensity was 1.0mm/min.(3) Hedysarum scoparium had significantly improved the time of runoff.The time of runoff was respectively increased by 51.4%,51.3% and 59% when the rainfall intensity was 0.5 mm/min,1.0 mm/min and 2.0 mm/min.%为了恢复兰永公路的边坡植被并研究植被对边坡防护的影响,在项目区K35+495~K35+768段(经纬度:(103.1906704 E,35.997268 N)进行人工模拟降水实验.在五种植被(沙冬青、紫穗槐、梭梭、花棒、柽柳)坡面上进行人工降水,分析了不同降水强度(0.5 mm/min、1 mm/min和2 mm/min)对边坡产流时间、产流量、平均入渗率、径流转化率的影响.结果表明:1)沙冬青、紫穗槐在降水过程中对边坡产流时间、产流量、平均入渗率、径流转化率的影响无显著性差异,能显著地延迟产流时间、削减产流量,降低径流转化率.尤其是降水强度为1.0 mm/min时,效果显著,其产流时间分别提高了84.7%、118.6%,产流量分别降低25.8%、29.0%,径流转化率分别降低8.1%、12.1%.2)梭梭和柽柳总体上在同一降水强度下,产流时间、平均入渗率和径流转化率无显著性差异,并且提高了边坡土壤的入渗,在降水强度为0.5 mm/min时,其平均入渗率分别提高了52.8%、43.4%.3)花棒能显著提高产流时间,在降水强度为0.5 mm/min、1.0 mm/min和2.0 mm/min时,其产流时间分别提高了51.4%、51.3%和59.0%.
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