Effect Of Vegetation Carpet On Plant Growth,Runoff And Sediment Yield On Slope Of Channel

In order to alleviate the serious problem of soil and water loss of slope in Hilly-Gully Loess Region,this project took Duanlanyao drainage slope in Qingshuihe County of Inner Mongolia as the research area,Three vegetation carpet measures were adopted:mixing Leguminosae and Gramineae plants(hereinafter referred to as Leguminosae and Gramineae plants)with 1:1 coconut carpet(L1G1),1:2 coconut carpet(L1G2)and 2:1 coconut carpet(L2G1)with 2:1 coconut carpet(L2G1)to set up runoff plots on slopes of 30,35,40 and 45 degrees.The plant growth status,species diversity of vegetation carpet measures and their effects on slope runoff and sediment yield.The results show that:(1)The vegetation growth of L1G1 is the best.Compared with L1G2 and L2G1,L1G1 had the highest species diversity.(2)In terms of runoff and sediment yield,the analysis of the benefits of runoff and sediment reduction by different vegetation carpet measures shows that the following three measures are L1G1(75.11%)>L1G2(49.3%)>L2G1(48.11%)and L1G1(87.96%)>L1G2(60.96%)>L2G1(58.95%).The effect of L1G1 was the most obvious.(3)When the rainfall intensity is 1-5mm·h-1,runoff and sediment yield of vegetation carpet cover and bare land increased with the increase of slope;when the rainfall intensity is 30-50mm·h-1,runoff and sediment yield of vegetation carpet cover and bare land increased and then decreased with the increase of slope which peaked at 40 degrees.Based on the analysis of the basic characteristics of vegetation,species diversity and runoff and sediment yield of three vegetation blanket measures,L1G1 is an effective measure to control soil and water loss of slope in Hilly-Gully Loess Region.