作物覆盖与径流能量的关系

黄土高原的土壤侵蚀往往是由几场大的暴雨形成的，因此研究植被覆盖与径流的能量关系具有积极的现实意义。在整理分析了黄土高原西峰、绥德、天水、淳化4个水土保持试验站降雨、径流及泥沙资料的基础上，探讨了作物覆盖与径流能量的关系。结果表明：①作物覆盖对径流能量具有消减作用，其削减率平均值为72．4％；②作物覆盖与平均径流能量削减率之间呈直线关系；③作物覆盖的削减能量作用受降雨动能的影响，随降雨动能的增大，植被对径流能量的削减作用减小。

Relations between Crops Coverage and Runoff Energy

Usually the soil of the Loess Plateau is eroded only by a few events of storms. Thus, it has positive and practical significance to study the relations between crops vegetation and runoff energy. The paper approaches the relations between crops vegetation and runoff energy based on the data of precipitation, runoff and sediment of 4 soil and water conservation experimental stations of Xifeng, Suide, Tianshui and Chunhua situated on the Loess Plateau. The results show that a) crops vegetation can reduce runoff energy and the mean reduction value is 72.4%; b) crops vegetation and the mean reduction ratio of runoff energy are in straight-line relationship; c) the energy reduction function of crops vegetation is effected by precipitation kinetic energy, the reduction function of vegetation to runoff energy is getting smaller as the increasing of precipitation kinetic energy.