摘要
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 human health. Concentration of selenium in soil is mainly controlled by the properties of the corresponding parent rocks. Apparently, investigating of selenium distribution in soil is of great importance on the rational development and utilization of land resources. On the basis of study on soil characteristics such as latecritic feature, color, trace element and rare earth element of 2 latecritic profiles in Kaiyang county, we suggest that latecritic layer can be divided into two sub-layers： namely, the bottom sub-layer that consists of dark purple-brown latecritic soil with high content of Se, trace elements and REEs, and the upper sub-layer that made up of purple and grayish yellow latecritic unit with relative low concentration of Se, trace elements and REEs. Bedrock is the material source of the selenium in latecritic profiles and also the primary controlling factor of selenium enrichment in soil. In addition, iron concentration, pH value, organic matters are also important controlling factors for enrichment of selenium, trace elements and REEs. Selenium was enriched abnormaly in Fe-bearing clay and the bottom sub-layer of the latecritic profiles, and their enrichment coefficients are 14.35 and 34.78 times over the average selenium content in Chinese soil, respectively.
出处
《土壤通报》
CAS
CSCD
北大核心
2012年第5期1086-1093,共8页
Chinese Journal of Soil Science
基金
国家211重点学科建设项目(KST-200903)资助
关键词
硒
元素富集
风化成土
微量元素
开阳
Selenium
Enrichment of element
Red clay Profiles Weathered
Trace elements
Kaiyang county
