坡度对扰动黄棕壤土壤侵蚀的影响

Influence of slope on disturbed yellow-brown soil erosion

通过人工模拟降雨试验,研究坡度对扰动黄棕壤的土壤侵蚀规律。结果表明：在坡度20°以内,随着坡度的增大,入渗量逐渐减少,径流量逐渐增大;坡度在20°~26.5°范围时,入渗量和径流量趋于平稳。土壤侵蚀量与径流量基本同步,在一定坡度内随着坡度的增大,侵蚀量增大;当降雨强度为40 mm/h和60 mm/h时,供试土壤侵蚀的临界坡度在20°~26.5°之间;当降雨强度增加至80 mm/h时,临界坡度大于26.5°。在试验坡度范围内,径流量、侵蚀量与降雨量均存在显著的线性关系。

In this study, the influence of the slope on disturbed yellow-brown soil erosion was investigated through a simulated rainfall experiment. The experimental results show that, when the slope is 20° or less, the infiltration volume decreases with the increase of the slope and the runoff increases with the increase of the slope. The infiltration volume and runoff level off when the slope is between 20° and 26.5°. The soil erosion amount is basically synchronous with the runoff and increases with the increase of the slope within a certain range of the slope. When the rainfall intensity is 40 mm/h or 60 min/h, the threshold slope of the tested soil erosion is between 20° and 26.5°. The threshold slope is greater than 26.5° when the rainfall intensity increases to 80 mm/h. There are significant linear relationships between the runoff, erosion amount, and rainfall within the range of the test slope.