黄土高塬沟壑区两种牧草蓄水保土效果试验

为了分析黄土高塬沟壑区牧草对蓄水保土的作用,在南小河沟范家山设置了牧场草区、金皇后苜蓿区和对比区,并进行了径流试验,观测了各小区的径流量、含沙量、冲刷量、土壤含水率和耗水强度等。结果表明:牧场草区、金皇后苜蓿区的径流量、含沙量、冲刷量均比对比区小,牧场草区、金皇后苜蓿区比对比区径流含沙量分别减少36.09%5、5.65%,牧场草区、金皇后苜蓿区冲刷量比对比区分别减少53.32%6、9.93%。牧场草区、金皇后苜蓿区耗水强度与对比区相同,但土壤含水率比对比区大。

Tests on Effect of Two Kinds of Grasses for Soil and Water Conservation in Gullied Loess Plateau

In order analysis gullied Loess Plateau area of forage for water and soil conservation,in Nanxiaohegou Fan Jiashan set up a Bromus biebersteinii area,Medicago sativa L areas and comparison areas,and runoff experiments and observed runoff of each plot,sediment,erosion,soil moisture and pasture water intensity.The results showed that: the district of Bromus biebersteinii,alfalfa area of Medicago sativa L runoff,sediment,erosion volume is smaller than the comparison area,Bromus biebersteinii area,the Medicago sativa L area than the comparison district sediment are reduced by 36.09% and 55.65% respectively,Bromus biebersteinii area,the Medicago sativa L area erosion than the comparison area are reduced by 53.32% and 69.93% respectively.Comparing the water consumption intensity of pasture grass area,the Medicago sativa L is the same as the check area,but the soil moisture content is greater than that of in the check area.