感耦等离子体发射光谱法研究土壤-铁芒萁系统中稀土元素的分布、累积和迁移特征  

ICP-AES studies on characteristics of distribution,accumulation and transportation of rare earth elements in soil-Dicranopteris dichotoma system.

作　　者：魏正贵[1] 宛寿康[1] 张巽[1] 洪法水[1] 赵贵文[1] 陶冶[2] 汪振立[2] 谢先求[2] 

机构地区：[1]中国科学技术大学 [2]中国科学院高能物理研究所,北京100039

出　　处：《应用生态学报》2001年第6期863-866,共4页Chinese Journal of Applied Ecology

基　　金：国家自然科基金资助项目 (2 980 50 0 3和 2 92 71 0 30 )

摘　　要：用感耦等离子体发射光谱法 (ICP AES)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La、Ce、Pr、Nd、Sm、Gd、Dy、Yb和Y的含量 ,并对其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 ,土壤剖面层的底土层含量最高 ,但表土层铈相对富集 .稀土元素总量 (ΣREE)在铁芒萁植物体内的分布规律是叶 >根 >茎 >叶柄 ,单一稀土元素的分布规律各异 ,La、Ce、Pr、Nd的分布规律表现为 :叶 >根 >茎 >叶柄 ;Sm和Gd在不同采样点表现为叶 >根 >茎 >叶柄或根 >叶 >茎 >叶柄 ;Dy、Yb和Y均有 3种不同的分布模式 :叶 >根 >茎 >叶柄、根 >叶 >茎 >叶柄及根 >茎 >叶 >叶柄 .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 La,Ce,Pr,Nd,Sm,Gd,Dy,Yb and Y in soils and Dicranopteris dichotoma collected from 4 rare earth mining areas and 1 non-mining area in south Jiangxi Province were determined using the inductively coupled plasma atomic emission spectrometry(ICP-AES) method,and the distribution patterns and transportation characteristics of the rare earth elements (REEs) in soil profiles and Dicranopteris dichotoma tissues were discussed.The results showed that the REEs contents in the C horizon the soils were the highest,but Ce was relatively concentrated in A horizon.The total amount of the REEs in Dicranopteris dichotoma tissues was in order of leaf>root>stem>leaf stalk,but the distribution patterns of individual REE were various,ie.,La,Ce,Pr and Nd,leaf>root>stem>leaf stalk,Sm and Gd,leaf>root>stem>leaf stalk or root>leaf>stem>leaf stalk,and Dy,Yb and Y,leaf>root>stem>leaf stalk,root>leaf>stem>leaf stalk,or root>stem>leaf>leaf stalk.The REEs were obviously fractionated in their transportion processes in Dicranopteris dichotoma tissues and heavy REEs in stems,leaf stalks and leaves of the plant were relatively poor.

关 键 词：感耦等离子体发射光谱法 稀土元素 土壤 铁芒萁 分布 迁移 积累 稀土污染 稀土富集 

分 类 号：S153.6[农业科学—土壤学]