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小流域是黄土高原水土流失综合治理的基本单元，研究其侵蚀产沙的空间分布，对于水土保持措施的实施，有着重要的意义。通过模拟试验，首次将REE示踪法引入到小流域侵蚀产沙的空间分布研究。试验结果表明：小流域侵蚀产沙的空间分布与小流域的沟道发育有着本质的联系。在流域发育的初始阶段，下切侵蚀是一种主要的侵蚀方式，侵蚀强烈部位从沟口向沟内延伸；随后河道侵蚀量减少，而溯源区和坡面产沙量增高。试验结果同时表明了REE多元素示踪法可比较满意地解决小流域侵蚀产沙的空间分布问题，是一种研究小流域泥沙来源的有效方法。
Small watershed is the basic unit of comprehensive management of soil and water loss in the Loess Plateau. Studying the spatial distribution of erosion and sediment yield is of great significance for the implementation of soil and water conservation measures. Through the simulation experiment, the REE tracing method was introduced for the first time to study the spatial distribution of soil erosion and sediment yield in small watershed. The results show that the spatial distribution of soil erosion and sediment yield in small watershed is intrinsically linked with the channel development in small watershed. In the initial stage of watershed development, undercut erosion is a major erosion mode, with strong erosion sites extending from Mizoguchi to the ditch; subsequently, the amount of river erosion is reduced while the amount of sediment produced in the source and slope areas is increased. The test results also show that REE multi-element tracing method can solve the problem of spatial distribution of soil erosion and sediment yield more satisfactorily and is an effective method to study sediment source in small watershed.