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９种不同性质土壤Ｃｅ和Ｎｄ吸附饱和度达５０％时，用同位素示踪法和数值模拟法对ＲＥ运移进行比较，发现两者对极大多数土壤有较好的拟合性，说明该数值模拟程序对预测稀土长期在土壤中运移具有一定的可靠性。预测结果表明，在自然降雨量情况下，ＲＥ吸附饱和度１０％时，在吸附容量小的酸性土壤中，ＲＥ下移约每年１ｃｍ，吸附容量中等的中性、微酸性土壤，每两年约下移１ｃｍ，而吸附容量较大的碱性土壤，ＲＥ很难被雨水运移
When the saturation of Ce and Nd reaches 50% in 9 different kinds of soils, the migration of RE is compared by isotope tracing method and numerical simulation, and it is found that the two have a good fitting to most of the soil, The numerical simulation program has certain reliability in forecasting the long-term rare earth migration in the soil. The results show that under the condition of natural rainfall, when the RE adsorption saturation is 10%, the RE decreases about 1cm per year in the acidic soil with small adsorption capacity, and the neutral and slightly acidic soil with moderate adsorption capacity, every two years Down 1cm, while the larger adsorption capacity of alkaline soil, RE hard to be transported by the rain