岩石—土壤—铁芒萁系统中稀土元素的分布、迁移和累积

在赣南非稀土矿区和四处不同稀土矿区内取样,用ICP-MS法测定岩石-土壤-铁芒萁系统中15个稀土元素的含量,并对其分布、迁移、累积特征进行了研究。结果表明:稀土元素在岩石、土壤各层含量由高到低的顺序为C(心土层)>A(表土层)>B(底土层)>D(成土母岩);在铁芒萁植物体内的分布规律是:轻稀土元素含量为叶>根>茎>叶柄;重稀土元素含量为根>叶>茎>叶柄;稀土元素演化、迁移的难易是由稀土元素的重轻所决定的;岩-土-芒萁系统各环节间稀土元素的含量模式基本相似,表征元素在岩石→土壤→植物大系统中存在着向量(非均衡性)关系。

Distribution, migration and accumulation of rare earth elements (REE)in the rock-soil-Dicranopteris dichotoma (R-S-D) system

The contents of 15rare earth elements(REE)in samples taken from the rock-soil-Dicra-nopteris dichotoma system(R-S-D)in one non-REE mining area and four REE mining areas in south-ern Jiangxi were determined by the ICP-MS method and their distribution,migration and accumulation were studied.Results show that the sequence of the layers in the system,in the order of decreasing REE contents,is as follows :layer C(subsoil)>layer A(topsoil)>layer B(bottom soil)>layer D(moth-er rock).The contents of REEs in the different parts of Dicranopteris dichotoma are leaf>root >stem>petiole for light REEs ,and root >leaf>stem>petiole for heavy REEs.The REE evolution and mi-gration in the R-S-D system depend on the weights of the REEs.The REE distribution patterns in vari-ous links of the R-S-D system are similar to each other,indicating a vectorial(inhomogeneous )relation of elements in the rock-soil-plant system.It can be concluded that there must be a stereo-correlation be-tween the plants with the environment.