稀土高背景区生物链中稀土元素的分布特征

Characteristic of Rare Earth Distribution in Biologic Chains of Rare Earth Rich Background Regions

对赣南两个典型轻（Ｂ区） 、重稀土（Ａ 区） 高背景区以及对照区水和植物中稀土含量进行了分析， 轻、重稀土高背景区水和植物中稀土含量具显著性差异。Ａ 区水体中可溶性稀土总量平为０－０３ ｍｇ·Ｌ－ １ ，Ｂ 区为０－１１ ｍｇ·Ｌ－ １。Ａ，Ｂ两区植物中稀土含量差异较大， 反映控制植物中稀土分配因素较多。Ａ，Ｂ区水中可溶性稀土含量分别是对照区（Ｃ区） 的１８ ，６８ 倍， 而Ａ，Ｂ区植物中稀土含量普遍比Ｃ区高， 某些植物中异常高的稀土含量可能是植物生长过程被动大量吸收的结果。

REE contents in water and vegetables from two typical RE rich background regions and normal region in Gainna, Jiangxi Province, China, indicate that REE contents are markedly different from in water and vegetables. There are average 0 03 and 0 11 μg·L -1 REE in water of A and B regions. As REE contents in vegetables from A region are different from B region, it is suggested that there are a lot of factors controlling REE distribution between vegetables. Comparing with the normal region, soluble REE contents in water of the RE rich background regions are a factors of 68 and 18 than that of the normal region. REE contents of most plants and crops in A and B regions are higher than that in the normal region. It is clear that REE are the indispensable elements of plants during their growing period. As there are unusually higher REE contents of some plants in A and B than in the normal regions, it is considered to result from absorbing REE passively during the period of plants and crops growing up.