贵州省土壤含硒量及其分布

Se CONTENTS AND DISTRIBUTION IN SOILS OF GUIZHOU PROVINCE

贵州省土壤全硒含量的范围为０．０６４－１．３２６ｍｇ／ｋｇ，平均值０．３６９ｍｇ／ｋｇ。全境上壤含硒有由北向东南和随地势下降而逐步增加的趋势。全省可划分为：１．低硒区２．中低硒区３．中硒区４．中高硒区。贵州多数地区土壤属中等含硒水平，少数上壤富硒，同时还有少量缺硒土壤分布。

The total Se contents of soils in Guizhou Province range from 0.064mg/ kg to 1.326mg / kg,with an average of 0.369mg / kg, tending to increase as the terrian decends from north to south east.The whole province can be divided into four Se regions:(1)the region of low Se content;(2) the region of medium-low Se content;(3) the region of medium Se content;and (4)the region of medium-high Se content. In general, most of the soils in Guizhou have a medium Se level, and only a small part belong to Se-rich soils.Besides,there exists some distribution of low Se content soils in Guizhou province.