黑龙江省宝清县万金山乡土壤硒分布特征及其与土壤性质关系

DISTRIBUTION OF SOIL SELENIUM AND ITS RELATIONSHIP WITH SOIL PROPERTIES IN WANJINSHAN OF BAOQING COUNTY,HEILONGJIANG PROVINCE

在宝清县万金山乡耕地区和林区按4个点/km2的密度采集了628件表层土壤样品,分析包括Se在内的28项化学元素指标.结果表明:万金山乡表土中Se元素平均含量为0.28×10^(-6),波动范围0.065×10^(-6)~0.51×10^(-6);富硒土地占全区3.16%,足硒土地占92.3%,硒潜在不足土地占4.3%,缺硒土地占0.24%,不存在硒中毒区域.黑土类型Se元素含量最高,沼泽土类型Se元素含量最低;Se元素含量在不同土地利用方式下表现为旱田>水田>灌木林地>乔木林地>草地及其他土地.相关性分析显示:土壤TOC、土壤黏粒含量对Se元素的富集有促进作用,pH对Se元素含量影响有限,但对Se元素有效性具有显著影响.

The study collects 628 topsoil samples at a density of 4 points/km2 in farm and forest areas of Wanjinshan Township,Baoqing County,to analyze 28 chemical indexes including Se etc.The results show that the average Se content in the topsoil is 0.28×10^(-6),ranging from 0.065×10^(-6) to 0.51×10^(-6),with the Se-rich land accounting for 3.16%,Se-sufficient land 92.3%,potential Se-deficient land 4.3%,Se-deficient land 0.24%and no Se poisoning area.Black soil type has the highest Se content,while swamp soil type has the lowest Se content.The Se contents in different land use patterns are ranked as follows:dry field>paddy field>shrub land>arbor land>grassland and other land.Correlation analysis indicates that soil TOC and clay content promote the enrichment of Se,while pH has a limited influence on Se content but significant effect on Se availability.