【作者】 黄炎和； 卢程隆；

【Author】 Huang Yan-he Lu Cheng-long (College of Resource and Environmental Science, Fujian Agriculture and Forestry University, Fuzhou 350002)

【机构】 福建农林大学资源环境学院；

【摘要】 分析结果表明:下垫面不同,次降雨量与土壤侵蚀量的关系也不同。①顺坡抛荒区的土壤侵蚀量与降雨量的线性关系模型;②采取了一定工程和植物措施后低坡度区土壤侵蚀量与降雨量没有显著关系;③采取了工程和植物措施后14°～22°各小区的土壤侵蚀量随降雨量的变化遵守y=axb且a>0,b>1或y=aebx,且a>0,b>0的函数规律。这两种函数特征都是一曲率凹向上的图象。它表明随着降雨量的增大,单位降雨量所引起的土壤侵蚀量在逐步增大。④当坡度达到26°时,各工程和植物措施区的土壤侵蚀量随降雨量的变化遵守y=axb,且a>0,0<b<1的函数规律。这一函数特征是一曲率凸向上的图象,它表明随着降雨量的增大,单位降雨量所引起的土壤侵蚀量在逐步减小。更多还原

【Abstract】 The result shows that the relationship between rainfall and the amounts of soil erosion changes following the changes of underlay situation. (11)It follows linear model in the uncultivated plot up-and-down-slope ridges. (2)In the low slope degree runoff plots with the measures of engineering and vegetation, it isn’ t significant. (3)In the14-22° runoff plots with the measures of engineering and vegetation, it follows the function of Y = aXb (a>0, b>1) or Y = aebx (a>0, b>0). Both of the two function are convex curvature images, which shows that with rainfall increasing, the amounts of soil erosion resulting from per-unit rainfall increases step by step. (4)fhen th slope degree attaining 26° , the relationship in the runoff plot adopting the measures of engineering and vegetation abides by the function of Y = aXb (a>0, 0<b>l), which is an image of concave curvature.更多还原