黑龙江省绥棱县土壤硒空间分布特征及其与土壤性质的关系

基于黑龙江省1：5万富硒土地专项调查取得的7701个高精度土壤数据，分析了硒、有机碳（TOC）、pH等理化指标，运用统计分析、相关分析研究了绥棱县农田土壤硒空间分布特征，并探讨硒与土壤性质的关系.结果表明，土壤硒含量在0.05×10^-6～0.87×10^-6之间，平均硒含量0.27×10^-6；农田土壤以足硒为主，足硒土壤占比88.00%，富硒土壤占比3.90%，硒潜在不足土壤占比7.24%，缺硒土壤占比0.86%.不同土壤类型硒平均含量由高到低依次为黑土 > 草甸土 > 暗棕壤 > 白浆土 > 风沙土.相关分析结果表明，TOC是影响土壤Se含量的主要因素，pH对土壤Se含量影响不明显.

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.