QUANTITATIVE MODEL TO ESTIMATE SOIL EROSION RATES USING CAESIUM-137 FOR CULTIVATED SOIL

According to mass balance model and the assumption that ceasium-137 in plowed soils shows a uniform distribution through the plow layer,a quantitative model was developed to relate the amount of caesium-137 loss from the cultivated soil profile to rate of soil erosion. The model shows the facts that the radioactive decay of 137Cs, 137Cs input fraction,the depth of, plowed layer and sampling year have a great influence upon cultivated soil loss from soil profile. The result of model proves that the relationship between the de of soil loss and 137Cs depletion is neither linear nor logarithmic.