海南省土壤中的硒

Selenium in Soils of Hainan Province

土壤中硒含量异常，通过食物链会影响人畜健康。化学分析结果表明，海南省土壤全硒量为０．０４３～０．７８５ｍｇ／ｋｇ，平均０．２９５ｍｇ／ｋｇ；土壤水溶态硒含量为３．５０～２０．５０μｇ／ｋｇ，平均８．２５μｇ／ｋｇ。土壤硒的含量取决于母质、土壤形成因素和发育过程以及土壤性质等。土壤腐殖质、粘土矿物、铁的化合物等对硒有明显的吸附固定作用。土壤硒含量有明显的地理分异，东部湿润地区硒含量明显高于西部半湿润半干旱地区。

The Se content in soils of Hainan province ranges from 0.043 to 0.785mg/kg, average content is 0.295mg/kg. The Se content in soils is controlled by a series of factors such as soil parent material, soil forming process and soil property, etc. The Se content in soils of Hainan mostly depend on the biotic climatic conditions. Se is often fixed by humus, especially by fulvic acid. The water soluble selenium content in soils of Hainan province ranges from 3.50 to 20.50 μg/kg. HSeO3-can combine with Fe(OH)3 into insobuble compound Fe2(OH)4SeO3,and this leads to a lower soluble Se content.