稀土元素在赣南非稀土矿区和不同稀土矿区土壤-铁芒萁(Dicranopteris linearis)系统中的分布、累积和迁移

Distribution,accumulation and transportation of rare earth elements in soil-Dicranopteris linearis system at South Jiangxi

:ICP-MS法测定了江西赣南地区非稀土矿区和 4处不同稀土矿区内 ,土壤 -铁芒萁系统中 1 5个稀土元素的含量 ,并对稀土元素在土壤剖面层及铁芒萁植物体内的分布、迁移特征进行了研究。结果表明 ,稀土元素总量在土壤剖面层的底土层含量最高 ,但表土层铈相对富集。稀土元素在铁芒萁植物体内的分布规律是叶、根 >茎 >叶柄。铁芒萁根中稀土元素的丰度与其母土表土层 ,尤其是母土表土层可溶态稀土元素的分布模式基本相似。稀土元素在铁芒萁体内的迁移过程中 ,发生了明显的分馏作用 ,茎、叶柄、叶中的重稀土相对贫乏。

The contents of 15 REEs in soils and Dicranopteris linearis, which were obtained from 4 rare earth mining areas and 1 non mining area located in the south of Jiangxi Province,have been determined by ICP MS.The distribution patterns and transportation characteristics of REEs of different soil profiles and different parts of Dicranopteris linearis were studied.The results showed that in the soil profiles,the REEs contents of the C layer were the highest,but Ce was relatively concentrated in the A layer.The REEs contents of different parts of Dicranopteris linearis were leaf,root>stem>leaf stalk.The REEs distribution patterns of Dicranopteris linearis root was similar with the patterns of the A layer of their host soils,especially with the soluble REEs distribution patterns of the A layer of their host soils.The REEs were obviously fractionated in their transportation procedure in Dicranopteris linearis, HREEs in the stem,leaf stalk,leaf were depletion.