福建典型富硒区表层土壤全硒含量的分布特征

Distribution Feature of Total Selenium in Surface Soil of Typical Selenium-rich Area in Fujian

为探明福建省三明市三元区表层土壤全硒(Se)含量的空间分布规律,合理开发利用当地土壤Se资源,采集三元区754个土壤样品和22个主要农产品样品,分析农作物的全Se含量特征,各类成土母质、土壤类型、土地利用方式土壤的全Se含量,及其与土壤其他元素(有机质、K2O和S)的相互关系。结果表明:三元区表层土壤平均全Se含量为0.52mg/kg,达到富硒土壤(0.40mg/kg)标准;土壤全Se含量与有机质含量的相关性较大,以黄壤土类、其他林地利用类型、二叠系翠屏山组地层发育的土壤全Se含量较高;三元区种植的部分水稻、地瓜和黄豆等农产品全Se含量达到相应的富Se标准。

Se content of different crops,total Se content of soils with different parent materials,soil types and land utilization patterns and mutual relation between Se and organic matter,K2 O,S were analyzed by determining 754 soil samples and 22 main agricultural products to verify spatial distribution pattern of total Se content in surface soil in Sanyuan District,Sanming City,Fujian and to develop and utilize local Se resources.The results showed that total Se content in surface soil is 0.52 mg/kg,which meets the standard of Se-rich soil （0.40 mg/kg）and there is a high correlation between total soil Se content and organic matter content.Se content of yellow soil,forest land and soil developed from Permian System is higher.Total Se content in part rice,sweet potato and soybean cultivated in Sanyaun District reaches the relevant Se-rich standard.