黑土有效硫含量状况及其评价

对三个典型黑土区采样分析了土壤有效硫的含量情况,并对有效硫分级进行了讨论。结果表明:黑土耕层(0～20cm)土壤有效硫含量平均值为27.7mgkg-1,变幅为7.09～109.14mgkg-1;20～40cm土壤中有效硫含量平均为18.17mgkg-1,变幅为0.43～68.9mg kg-1。黑土有效硫含量耕层最高,随土层深度的增加土壤有效硫含量迅速下降。黑土耕层有效硫含量随开垦年限增长呈下降趋势。黑土有效硫含量随着溶液电导率增加而增加。按缺硫标准进行评价,北安地区耕层土壤有效硫含量小于16.0mg kg-1的农田面积约占9.5%,公主岭地区占16.1%,海伦地区占26.7%。

Status and Appraise of Available Sulfur in Black Soils

This article analyzed the available sulfur content in 3 typical kinds of black soils in Northeasten China.The results showed that the average content of available sulfur in top soil was 27.7mg kg-1(7.09-109.14mg kg-1).The average content in 20-40cm was 18.17mg kg-1(0.43-68.9mg kg-1).The content of available sulfur in plow layer was the most,then descended rapidly along with the increasing of the deepness of soil layer.The available sulfurde creased with the reclaim year and increased with the conductance rate.After appraising according to the standard of available sulfur,about 9.5%,16.1% and 26.7% of the area in Beian,Gongzhuling and Hailun farmland were less than 16.0mg kg-1.