2种形态稀土在水稻幼苗体内的富集规律研究

研究Ｌａ、Ｇｄ、Ｙ轻、中、重稀土离子和稀土－ＥＤＴＡ配合物２种不同形态稀土元素的根、茎叶中的富集规律，结果表明，在实验浓度范围内，水稻的根及茎叶对稀土元素的培养液叶中的稀土含量呈正相关；稀土的离子形态为根利用的有效形态，其在水稻幼苗中的分布为根〉茎叶，当以稀土－ＥＤＴＡ配合态存在时，其在根部富集明显低于离子态，在茎叶中富集则显著增大，显示出稀土－ＥＤＴＡ配合态为植物茎叶利用的有效形态。

Bioaccumulation of Two Speciations of Rare Earth Elements in Rice Seedling

Bioaccumulation of light,medium,and heavy rare earth elements and their EDTA complexes by rice seedling was investigated simutaneously.The results showed that the bioaccumulation values in the root and above ground parts(stem & leave)of the rice seedling were positively correlated with the concentration of the rare earth elements in the culture solution.The results all showed that the ion speciation of the rare earth elements was the effective speciation for the root of plant,the order of bioaccumulation values was:root>stem & leave;the bioaccumulation values of EDTA complexe in the root decreased obviously,while in the stem & leave the value increased evidently,so the speciation of EDTA complexe was the effective speciation for the above ground parts of plant.