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本文对五个不同母质来源的红壤剖面层中稀土元素的结合形态进行了研究，统计表明稀土元素的各种结合形态中以残渣态为主，其次为铁锰氧化物结合态，大部分稀土元素的可交换态、碳酸盐结合态、有机质结合态及酸溶态含量较为接近。各剖面层中稀土元素结合形态的变化大致可分为两类，一类以表层含量较高，如有机质结合态；另一类以深层含量较高，如可交换态、碳酸盐结合态、残渣态和酸溶态，而铁锰氧化物结合态变化较复杂，但主要集中在深层。不同母质对不同稀土元素的各种结合形态亦有一定的制约作用，表现为某些稀土元素的一些结合形态在一种或几种母质的红壤中占主导地位。本文还对稀土元素的各种结合形态与红壤的硅酸盐成分及其有机质含量、ｐＨ值间进行了相关分析，认识到结合形态与红壤本身成分间的密切关系。
In this paper, the morphology of rare earth elements in red soil profiles from five different parent materials was studied. The statistical results show that the rare earth elements are mainly in the residual state, followed by the Fe-Mn oxide bound state, most of the rare earth elements Exchangeable, carbonate-bound, organic matter-bound and acid-soluble content is closer. The changes of REE binding patterns in each profile layer can be divided into two types, one is higher content of surface layer, such as organic matter-bound state, the other is higher content of deep layer, such as exchangeable state, carbonate- Residual state and acid-soluble state, while the Fe-Mn oxide combined state changes more complicated, but mainly concentrated in the deep. Different parent materials also have some restraint on the various combinations of rare earth elements. Some binding forms of some rare earth elements are dominant in red soil of one or several parent materials. In this paper, the correlation analysis of various binding forms of rare earth elements with silicate composition, organic matter content and pH of red soil was also made, and the close relationship between the combination forms and red soil composition was recognized.