坡面土壤侵蚀垂直分布定量分析研究

Study on Vertical Distribution of Soil Erosion on Loess Slope

通过野外侵蚀小区实验，进一步证明了稀土元素示踪法[1]在土壤侵蚀垂直分布研究中的可应用性。在一个侵蚀小区上，实验揭示出产沙强度随坡长存在三种变化模式．增长型，增长一递减型和波动型，其形成机理可能与住流过程有关。利用稀土元素在坡面的再分布、初步建立了治界被面沟蚀率的关系式。稀土元素点穴施效法尚存在问题，有待深入研究。

Vertical varlabilityisa basic componentof soilerosion on loess slope. Experiments of field erosion Plot were conducted and furthersupportthe availability of rare earth elements (REE ) tracer method to studythe vertical distribution of soil erosion. Experiments on a erosion plot have firstly revealed that vertical distribution pattern ofsediment yield have three types that are continued -increasing type. increase -decreasing type and wave type. We have primarily ccnstructedmethod estimating ratio of rill erosion according to redistribution ofREE on loess slope.