稀土在农作物中吸收分布

Study on Absorption Distribution of Rare Earth Elements in Crops With Rare Earth Fertilizer

通过对农作物中5个稀土元素(La、Ce、Nd、Y、Gd)的含量分布以及单一稀土的分布规律的研究。结果表明:农作物吸收稀土的能力与土壤可给稀土量呈正相关,植物体各部位稀土含量分布一般为根>叶>茎>果实;单一稀土在根部的分布特征是La>Ce>Nd>Y>Gd,在叶,茎,果实的分布特征是Ce>La>Nd>Y>Gd,说明轻稀土较重稀土易被植物吸收;植物在生长不同期吸收稀土的能力大小为:幼苗期>分枝期>成熟期。总之,稀土元素在植物中不易迁移,主要集中在根部,果实中含量甚微。

The absorption and content distribution of 5REs (La,Ce,Nd,Y and Gd) in 3species of crops (corn,paddy and soybean )have been studied. The results show that there exists the positive relationship between capability of rare earth elements being absorbed by crops and available rare earth elements in soil. Generally,content distribution of rare earth elements in crops are root >leaf >stem >fruit. Distribution of unitary rare earth elements in root is La>Ce>Nd>Y>Gd,and in leaf ,stem and fruit is Ce>La>Nd>Y>Gd. It is proved that light rare earth elements absorbed are easier than heavy rare earth elements. In addition ,capability of rare earth elements absorbed in crops growing is seedling >ramification >maturity . In a word,the data of pot experiment show that most of bioaccumulation in root . Thus, it is helpful to agricultural application of rare earths.