Using Rear-Earth Element Tracers for Studying Spatial and Temporal Process of Soil Erosion in Sloping Land

By placing different rare earth oxide in different soil depth and different section across a slope in the field plots, the temporal and spatial process of soil erosion is studied under simulated rainfall situation. The results indicated that there is a dynamic process from sheet erosion, ripple erosion near the plot bottom, headward erosion, and relative stableness of slope(ended on the erosion basis). Relevant erosion types were dominant within corresponding erosion stages. The emergence of rill head is the key factor boosting up the erosion of different section on slope. Under gentle intensity consecutive rainfall, headword erosion is dominant on the plots, and its erosion process is much more stable than erosion process of the first rainfall.