中文摘要：

坡度是土壤养分流失的重要因素,通过室内人工降雨模拟试验,研究不同坡度土壤侵蚀和养分流失的过程与机制。研究结果表明：土壤中养分的流失量随坡度的增大而增大,但在20°附近时存在转折点,25°时养分流失量反而减小。同时利用两种类型描述径流养分浓度模型对实测资料进行分析,结果显示与指数函数模型相比较,采用幂函数模型能够较好地模拟黄土坡面非饱和条件下径流溶质浓度变化过程,同时幂函数模型也能够较好地描述径流中钾离子和溴离子的质量变化过程,为进一步完善黄土坡面径流养分迁移模拟模型提供了参考。

英文摘要：

To study mass transport from slope land,the process and mechanism of soil erosion and nutrient loss on the slope land under different slope conditions were investigated by simulating rainfall. Results had indicated that, the nutrient of testing soil increasing with the slope,therefore in the proximity of 20~presence turning point,at 25~ nutrient drain measure instead wane up. Compared with the exponent function, the power function can be more suitable for fitting the change of chemicals concentrations in runoff under unsaturated conditions from the loess slope,as well as,the mass loss of potassium and bromine in runoff,but not for initial phase. The study offered a reference for developing the model of soil nutrient in runoff transport of the loess slope.