贵州省土壤硒的背景值研究

在贵州省 17 6× 10 4km2 的范围内 ,按点位法采集土壤样品进行硒含量的测定 ,获得 947件样品的算术平均值为 0 39mg kg ,中位数为0 30mg kg。全省土壤含硒量在 0 0 6～ 1 2 9mg kg之间。全省大部分地区属于硒含量适中区。研究表明 ,贵州省的土壤大多数是基底岩石原地风化形成的 ,所以 ,基岩含硒量的高低对土壤含硒量起主要制约作用 

A Study on the Selenium Background Level in the Soils in Guizhou

The selenium contents in sample soils have been determined for Guizhou Province with an area of 176 000 km+2.The arithmetic mean of 947 samples is 0.39 mg/kg,the median value is 0.30 mg/kg,and the selenium contents varied from 0.06 to 1.29 mg/kg in the soils over the province.It is shown that most areas in Guizhou are moderate in selenium contents.Since most soils in Guizhou come from the weathering of the basement rocks in place,the selenium contents in the soils are restricted by the basement rocks.