Abstract:

Soil belts of the oxide with REE such as La、Se、Nd、Sm、Eu and Dy were disposed every other 10?m on the bare straightly sloping surface along sloping length (60 m) and sloping degree (6°) in loess plateau. Under the condition of simulating typically erosive rainfall with fainfall intensity (1.0 mm·min^-1) and rainfall duration (40 min), the process of runoff-sediment, sediment discharge of different periods and six kinds of rare earth elements in different positions along the sloping surface were measured and analyzed in the outlet. The results showed that the main place of sediment was 30～50 m from dividing ridge, and the difference of source and distribution about sediment was not obvious along the sloping surface.

Key words: Soil erosion, REE, Loess plateau