黄土高原典型区植被对水土流失影响研究

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

摘要: 通过对天水梁家坪、西峰南小河、绥德辛店沟1945~1986年坡面径流场的植被覆盖度及产沙数据进行定量分析，研究黄土高原典型区植被对水土流失的影响。结果表明，绥德、西峰、天水地区降雨量P（mm）、平均雨强I_平均（mm／min）、最大雨强I_最大（mm／min）、植被覆盖度C（%）与水土流失量之间多呈M＝KH^a（I_平均）^b（I_最大）^cC^d回归关系。其中，南小河沟流域的“有效植被度区间”为40%～60%，绥德辛店沟的“有效植被度区间”为20%～40%。

Abstract: 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%。