稀土元素示踪法在坡面土壤侵蚀垂直分布研究中的应用

通过野外全坡长侵蚀小区试验，证明了稀土元素示踪法在土壤侵蚀垂直分布研究中的可应用性。结果表明该径流小区产沙强度坡长存在三种变化模式：增长型，增长 递减型和波动型，其形成机理可能与径流过程有关。利用稀土元素在坡面的再分析，初步建立了估算坡面沟蚀率的关系式。

The vertical variability is one of basic components of soil erosion on loess slope. The experiments on a erosion plot have firstly revealed that the vertical distribution pattern of sediment yield have three types: the continued-increasing type, the increase-decreasing type and the wave type. We have primarily developed a method estimating ration of rill erosion according to redistribution of the rare earth element on loess slope.