摘要
This analysis studies changes in the variation 210Pbex inventory in soil in response to soil erosion on uncultivated land.A model was created to fit the response of 210 Pb ex inventory to variations in soil erosion rates on uncultivated land using the principle of mass balance.By numerical simulation of the variation in the soil erosion rate in soil of uncultivated land,we prove:(1) past use of what has long been considered the best method of determining 210 Pb ex levels over the past 100 to 200 years is not scientifically accurate;(2) the model shows that variation in 210 Pb ex inventory as a function of time varies according to the index law after variation of soil erosion rates in uncultivated land is considered;and(3) the time needed for the variation in 210 Pb ex inventory to reach a steady-state is affected by changes in the rate of soil erosion and the quality and depth of relaxation in soil of uncultivated land.The results of this research can guide efforts to measure soil erosion rates.
This analysis studies changes in the variation ^210Pbex inventory in soil in response to soil erosion on uncultivated land. A model was created to fit the response of ^210Pbex inventory to variations in soil erosion rates on uncultivated land using the principle of mass balance. By numerical simulation of the variation in the soil erosion rate in soil of uncultivated land, we prove： （1） past use of what has long been considered the best method of determining ^210Pbex levels over the past 100 to 200 years is not scientifically accurate; （2） the model shows that variation in ^210Pbex inventory as a function of time varies according to the index law after vari- ation of soil erosion rates in uncultivated land is considered; and （3） the time needed for the variation in ^210Pbex inventory to reach a steady-state is affected by changes in the rate of soil erosion and the quality and depth of relaxation in soil of uncultivated land. The results of this research can guide efforts to measure soil erosion rates.
基金
supported by the National Natural Science Foundation of China (41030751,41173094 and 41103047)
the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
