浙中典型富硒土壤区土壤硒含量的影响因素探讨

通过对浙江省中部典型富硒土壤区的系统调查研究,总结了影响土壤硒含量的主要因素.结果表明,地质背景对土壤硒含量有控制作用,汤溪组、之江组和金华组分布区的土壤硒含量明显高于其他地质背景区.研究同时发现,土地利用方式对土壤硒的迁移富集有不可忽视的影响,旱地土壤比水田土壤更易富集硒元素.由于土壤有机质对硒的吸附与固定作用,致使其成为影响硒含量的重要因素之一.除此之外,研究认为土壤质地也是影响土壤硒含量的重要因素,土壤中黏粒含量越多,越黏重,硒含量往往较高.

Study on Selenium Contents of Typical Selenium-rich Soil in the Middle Area of Zhejiang and Its Influencing Factors

Based on the study of typical selenium-rich soil in the middle area of Zhejiang province, the influencing factors of selenium contents were summarized. We found that the selenium contents were controlled by the geological background. It was much higher in Tangxi, Zhijiang, and Jinhua than in other geological background regions. In addition, the contents of selenium in soil under different land use types showed a great difference. The content in the dry land was much more enriched than that in the paddy field. Further research showed that selenium was closely related to soil organic matter because of its adsorption and fixation. Moreover, we found that the soil texture was another important influencing factor. Selenium contents increased with increasing content of clay in the soil.