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通过系列室内人工降雨模拟试验,观察了不同坡度(5°、10°、15°、20°、25°)和不同降雨强度(43mm/h、83mm/h、115mm/h)组合条件下,3种外源稀土元素Nd、Ce、La和磷素随土槽坡面径流输出的特征.结果表明,92%以上的外源稀土元素和磷素都是以径流颗粒物形式输出,且3种外源稀土元素与磷素随径流输出的总量均呈极显著的相关性;在不同雨强下,外源稀土元素和磷素随径流流失总量与坡度呈二次抛物线型关系,即随坡度增大而增大,但土槽坡度增加到一定程度时存在转折点,临界坡度的变化范围为22—26°.
A series of indoor artificial rainfall simulations were conducted to investigate the effects of different rainfall gradients (5 °, 10 °, 15 °, 20 °, 25 °) and different rainfall intensities (43mm / h, 83mm / h, 115mm / h) The results showed that more than 92% of the exogenous rare earth elements and phosphorus were exported as runoff particles, and three kinds of exogenous Under different rainfall intensities, the total amount of rare earth elements and phosphorus excreted with runoff showed a quadratic parabola relationship with the gradient, that is, with the increase of slope Large and large, but there is a turning point when the soil slope gradient increases to a certain extent, and the variation range of the critical slope is 22-26 °.