研究了在小麦土培过程中黄棕壤中内源及外源稀土元素的形态分配特征及其动态变化。结果表明,生物作用使土壤中内源稀土元素由植物难利用形态向易于吸收利用形态转化 ,外源稀土元素在土壤中有不断变固定的趋势。外源稀土元素主要进入了土壤中的有机结合态 ,其分配系数可达80 %以上。外源单一稀土元素La、Ce、Pr、Nd在土壤各形态中的分配存在差异。 The morphological distribution and dynamic changes of endogenous and exogenous rare earth elements in yellow brown soil during wheat soil culture were studied. The results showed that the biological effect of endogenous rare earth elements in the soil from the plant to the easy-to-use forms of transformation, rare earth elements in the soil is constantly changing trend. Exogenous rare earth elements mainly enter the soil organic binding state, the partition coefficient of up to 80%. Exogenous single rare earth elements La, Ce, Pr, Nd in the distribution of soil morphology differences.