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

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 river basin of the Loess Plateau were investigated.The results show that there are similar changing trends(y=b0+b1x+b2x2+b3x3) between 15min rainfall intensity and runoff,sediment concentration,and sediment yield respectively in semi-arid region of the Loess Plateau.Under the same rainfall intensity of 15min,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.