摘要
以三江平原典型类型湿地及不同开垦年限的耕地 (旱田 )为研究对象 ,对其土壤中总硫及各形态硫的含量变化进行分析 ,结果如下 :总硫、水溶性硫、吸附性硫、盐酸可溶性硫、盐酸挥发性硫及有机硫含量排序均为小叶章 (Calamagrostisangusti folia)草甸 <乌拉苔草 (Carexmeyeriana)沼泽 <毛果苔草 (Carexlasiocarpa)沼泽 ;湿地开垦为耕地后 ,除盐酸可溶性硫含量增加以外 ,其余硫组分的含量均有不同程度的降低 ;耕地土壤中总硫及有机硫含量随开垦年限的增加而下降 ,而无机硫各组分随开垦年限的增加变化量不大 .湿地开垦前土壤总硫量为 6 2 2 4mg kg ,湿地开垦 2 0年后 ,土壤总硫量降低为 16 8mg kg ,因此在人类活动的干预下湿地开垦后表现出由汇转化为源 。
Three typical wetlands and arable soils reclaimed in different years were studied in this paper.The contents of total sulfur and the other sulfur forms in soils were analyzed.The results indicate that the contents of all sulfur forms were Calamagrostis angustifolia wetland<Carex meyeriana wetland <Carex lasiocarpa wetland.Except HCl soluble sulfur,the other sulfur fractions were all lower in arable soils than in wetland soils.The contents of total sulfur and organic sulfur decreased following the reclamatkon years,but inorganic sulfur has changed little.The total sulfur has changed from 622.4 mg/kg in wetland soils to 168 mg/kg in arable soils after twenty years.So the human activities enhanced the transportation of sulfur in wetlands.And wetland was transformed from sink to source of sulfur.
出处
《环境科学学报》
CAS
CSCD
北大核心
2003年第5期614-618,共5页
Acta Scientiae Circumstantiae
基金
中国科学院知识创新工程重大项目 (KZCX1 SW 0 1 0 1B)
中国科学院湿地创新项目 (KZCX2 30 2 )
