湖北省随县洪山镇土壤Se的地球化学特征

Geochemical Characteristics of Soil Selenium in Hongshan Town,Suizhou City,Hubei Province

通过对湖北省随县洪山镇开展土壤地球化学调查,研究土壤Se的地球化学分布特征和影响因素。研究表明,研究区内表层土壤Se含量平均值为0.27 mg/kg,是全国均值的1.3倍,整体属足硒适中水平。研究区内富硒区土壤Se含量主要受地质背景控制,震旦系及寒武系地层分布区是主要的富硒区域,富硒区域内土壤Se含量随深度增加而升高。研究区内第四系、白垩系、元古界及侵入岩分布区为非富硒区,成土母源的控制作用较弱,其表层土壤Se含量与有机质含量关系密切,在成土母岩和次生生物富集等多因素的共同作用下,表层土壤Se含量有不同程度的次生富集现象。

The geochemical distribution characteristics and influencing factors about selenium in soil are studied throughcarrying out soil geochemistry survey in Hongshan town, Suizhou city, Hubei province. The research show that seleniumcontent in soil is in average of 0.27 mg/kg in surface soil area and is 1.3 times in national average value, also belongs tomoderate enough selenium level in the overall. Selenium content in soil is mainly controlled by the geological backgroundin selenium-rich area, Simian system and Cambrian strata distribution areas are the main selenium-rich area and seleniumcontent in soil increased with the increase of depth in this area. Quaternary, Cretaceous, Proterozoic and intrusive rockdistribution are the rich selenium areas and the control action about original source of soil formation is weak. And seleni-um content in surface soil has a close relationship with organic matter content and has secondary enrichment phenomenonin different levels under the common action of soil parent rock and secondary bioaccumulation factors and so on.