沟坡侵蚀REE示踪法试验研究初探

Research on the Rare Earth Element (REE) Tracer Method of Slope-gully Erosion

为解决野外小流域泥沙来源研究中REE的施放问题，在室内利用人工模拟降雨的方法，对坡面一沟坡连续体模型REE施放方法进行了试验研究。结果表明，对于坡度较陡，汇流相对集中的沟坡部位，可采用点穴施放法布设稀土元素，但仍需掺土，若布设纳稀土元素实际操作难度较大。在此基础上，提出了在野外小流域泥沙来源观测中可采用网格法布设点穴，并对其产沙量计算亦提出了相应的设想及方法。

For tackling the rare earth element (REE)tracing method of small watershed erosion researching, the slope-gully model REE tracing method was carried by the simulated rainfall experiment. The result showed that we can use spot method taking REE on the gully region with the slope gradient stepness and the runoff intensity big, but before taking, we must mix REE with the soil,using pure REE is very difficult. Based On this,we Suggested that we can use grid method to select spot in the observation of small watershed erosion, and take the REE, another we give a plan of calculation erosionyield in the small watershed sedimentyield.