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.
出处
《应用生态学报》
CAS
CSCD
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 )
