Research on Effect of Loess Plateau Typical Area Vegetation to Water and Soil Loss

This article quantitatively analyzes 1945-1963 slope runoff vegetation coverage and sediment yield of Liangjiaping of Tianshui, Nanxiao river of Xifeng, Xindiangou of Suide, and researches the affection of Loess Plateau typical area vegetation to water and soil loss.The results show that the rainfall P(mm), the average rainfall intensity I_average(mm/min), the maximum rainfall intensity I_max(mm/min), vegetation coverage C(%)and soil erosion amount in Suide, Xifeng, Tianshui area mostly presents M=KH^a(I_average)^b(I_max)^cCd regression relation.Among them, the effective vegetation degree intervalofNanxiaohegou basin and Xindiangou of Suide respectively are 40%～60%and 20%～40%。