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硒是人体必需的微量元素,土壤中的硒含量受基岩的控制,研究土壤中硒的分布情况,对合理开发利用土地资源具有重要意义。通过对开阳地区红粘土剖面的结构、颜色、微量元素、稀土元素分布特征研究,提出红粘土层可划分为两层:底部为暗紫褐色粘土,含有很高的Se元素及其它微量元素和稀土元素;顶部为紫红色粘土-灰黄色粘土,Se元素以及其它微量元素、稀土元素含量较低。基岩是红粘土剖面中硒元素的物质来源,其是土壤中硒含量的主要控制因素,另外,Fe含量、pH值、有机质也是微量元素包括硒元素、稀土元素富集的重要的控制因素,硒元素在铁质层和红粘土底部超常富集,这两层中硒含量分别是中国土壤硒平均含量的14.35倍和34.78倍。
Selenium is an essential trace element for the human body. The selenium content in the soil is controlled by bedrock. Studying the distribution of selenium in the soil is of great significance for the rational exploitation and utilization of land resources. Based on the study on the structure, color, trace elements and REE distribution characteristics of red clay in Kaiyang area, it is suggested that the red clay layer can be divided into two layers: the bottom is dark purple brown clay with high Se and other trace elements and Rare earth elements; the top is purple clayey - gray yellow clay, Se elements and other trace elements, rare earth elements content is low. The bedrock is the material source of selenium in the red clay profile, which is the main controlling factor of selenium content in the soil. In addition, the content of Fe, pH and organic matter are also the important controlling factors for the enrichment of trace elements including selenium and rare earth elements, Selenium is extremely enriched in the iron layer and the bottom of the red clay. The content of selenium in these two layers is respectively 14.35 and 34.78 times the average content of selenium in Chinese soil.