SPATIAL DISTRIBUTION OF SOIL SELENIUM AND ITS RELATION WITH SOIL PROPERTIES IN SUILING COUNTY, HEILONGJIANG PROVINCE

Based on the 7 701 high-precision soil data obtained from 1:50 000 special survey of the Se-rich land in Heilongjiang Province, the paper analyzes the physiochemical indexes such as Se, TOC and pH, and uses statistical analysis and correlation analysis to study the spatial distribution characteristics of Se in farmland soil of Suiling County and discuss the relation between soil property and Se. The results show that the soil Se content is 0.05×10^-6-0.87×10^-6, averagely 0.27×10^-6. The farmland soil is Se-sufficient dominated, accounting for 88.00%, with Se-rich soil 3.90%, potential Se-deficiency soil 7.24% and Se-deficient soil 0.86%. The average Se content in different soil types from high to low is as follows:black soil, meadow soil, dark brown soil, albic soil and aeolian sandy soil. The correlation analysis results indicate that TOC is the major factor affecting soil Se content, while the influence of pH is not so obvious.