东北地区黑土硫的分布特征及其与土壤性质的关系

在兼顾土壤样点空间分布相对均匀的前提下,采集了中国东北地区具有代表性的黑龙江省北安市、海伦市和吉林省公主岭市的黑土样,对这些地区的黑土中硫素含量进行了分析。结果看出,不同地区黑土中全硫含量存在明显差异,其全硫含量依次为北安(北部黑土)海伦(中北部黑土)公主岭(南部黑土)。随剖面的加深,自上而下土壤全硫都呈下降的趋势,但在145cm深处升高。全硫在开垦前期呈下降趋势,随着开垦年限的增加,土壤全硫含量下降逐渐趋于平稳。相关分析表明,土壤全硫与土壤有机质等指标都达到了显著或极显著相关水平。黑土中三种形态有机硫含量占全硫含量的78％。

The sulphur distribution in relation to properties of black soil in northeastern China

Sulphur is an essential element for the crop growth. Black soil is one of the fertile soils in China, but sulphur deficiency has been reported in recent years. Sulphur content, forms and distribution in black soil were studied by determination of the soils sampled from three typical areas in the northeastern China. The main results obtained are as follows: 1)The average content of total S in 0-20cm depth in black soil is 405mg/kg, ranging from 190 to 1210mg/kg and 295mg/kg in 20-40cm depth, ranging from 160 to 690mg/kg. In the three areas tested, the total S content is in the order: Beian(north) > Hailun(middle north) > Gongzhuling(south); 2)Total S content in soil decreased apparently at earlier stages of reclamation and tended to be unchanged progressively; 3) Total S was significantly correlated to organic matter, CEC, clay and pH; 4)Total S decreased with the increasing of profile depth, but reached a peak in 145cm depth; 5)Three forms of organic S content (C-O-S, C-S and UO-S) accounted for 78% of the total S.