黄棕壤和黄褐土粘粒胶膜的元素组成特征与粘粒矿物

Characteristics of Elements and Clay Minerals of Argillans in Two Kinds of Soils in the Central China

通过对黄棕壤和黄褐土粘粒胶膜中元素和粘粒矿物的分析 ,比较了粘粒胶膜和基质土壤的性质、元素和矿物组成之间的关系。结果表明 :粘粒胶膜的pH值、粘粒含量、有机质、P2 O5、MnO2 、Fe2 O3、盐基等的含量和铁的活化度均比基质土壤的高 ;粘粒胶膜能富集Co、Pb、Zn、Cd等重金属元素。 2种土壤的粘粒胶膜和基质的粘粒矿物均由 1.4nm矿物、水云母、高岭石组成 ;黄棕壤基质和胶膜中的 1.4nm矿物为 1.4nm过渡矿物和蛭石的混合相 ,而黄褐土基质和胶膜中的 1.4nm矿物全部由蛭石组成。

The characteristics of elements and clay minerals of argillans in yellow brown soils and yellow cinnamon soils in the central China were analyzed and compared with their matrix soils. The results showed that the pH and contents of clay, O.M, P 2O 5, MnO 2, Fe 2O 3, base elements, FeO/Fed in argillans were significantly higher than those in the corresponding matrix soils. The heavy metal elements of Co, Pb, Zn, Cd enriched obviously in argillans. The clay minerals in two kind of matrix soils and argillans were both consisted of 1.4nm minerals, hydromica and kaolinite. In argillan and matrix of yellow brown earths,the 1.4nm minerals were 1.4nm intergrade minerals and vermiculites, but only contained vermiculites in argillan and matrix of yellow cinnamon soils .