湖南省慈利县富硒土壤分布及成因规律研究

The Research of Selenium Soil Distribution and the Causes of Law of Cili,Hunan

通过调查发现,慈利县分布有大面积的富硒土壤,960 km^2范围重点区中富硒土壤面积占524.2 km^2,土壤硒平均含量达0.54 mg/kg。各类成土母岩中,属二叠系的炭质页岩与灰岩硒含量最高,与其对应的是在各地质背景中二叠系表层土壤硒含量同样最高,其次为三叠系、志留系土壤,硒元素在土壤与母岩中具有显著继承性。各地层剖面均显示出硒元素呈现出表聚性规律,硒元素在表层土壤中大于深层土壤,而深层土壤硒含量则大于母岩硒含量。

A recent survey found that large area of selenium-rich soil distributes in Cili city, 524.2km2 selenium-rich soil exists in 960 km2 key survey area, the average selenium content of soil is up to 0.54 mg/kg. The selenium content of carbonaceous shale and limestone of Permian is higher than the other kind ofrocks, the selenium content of soil of Permian is the same highest among the different kind of geologicalbackground, and the soil of Silurian and Triassic take second place, selenium has remarkable inheritance insoil and parent rock. All profile of stratums show that selenium tends to be enriched in top soil, the selenium content of top soil is higher than deep soil while the selenium content of the parent rock is the lowest.