敦化大桥泥炭记录的积累人为大气铅沉降  

Cumulative,anthropogenic,atmospheric lead deposition recorded in Daqiao mire,Dunhua Basin,Changbai Mountains

作　　者：张思鹏[1] 卫江伟 杨倩楠[1] 赵红艳[1] 

机构地区：[1]东北师范大学泥炭沼泽研究所,国家环境保护湿地生态与植被恢复重点实验室,植被生态科学教育部重点实验室,吉林长春130024

出　　处：《东北师大学报（自然科学版）》2016年第2期122-126,共5页Journal of Northeast Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(41471165,41371103,40971036);吉林省自然科学基金资助项目(20130101081JC);国家级大学生创新创业训练计划项目(201510200053)

摘　　要：分析了敦化大桥泥炭地裕家剖面自2 120a(B.P.)以来泥炭中的铅、锆元素含量,计算了该剖面铅的富集因子、沉降速率,以及岩石铅和人为铅的含量.结果表明,大桥泥炭地该时期总铅含量变化在1.81~7.35μg/g,平均值为4.24μg/g.富集因子揭示剖面上部60cm,相当于1 300a(B.P.)以来有外来的铅富集,其下几乎无富集.裕家剖面铅沉降速率为0.54~4.97mg/(m^2·a),呈现随深度加深而增加的变化趋势.铅沉降速率与大气灰尘沉降速率呈明显的正相关(r=0.948,n=14,P<0.01),表明铅主要来自于大气灰尘.铅沉降速率与岩石铅含量也呈明显的正相关(r=0.784,n=14,P<0.01),意味着大气沉降的铅主要来自于岩石风化后的自然产物,而人类活动造成的人为铅污染较少.大桥泥炭地积累的人为铅总量为0.729 3g/m^2.The concentrations of lead,zirconium in the Yujia profile of Daqiao mire in Dunhua Basin were analyzed,the enrichment factor,accumulation rates,lithogenic and anthropogenic lead were calculated in this paper.The results show that the total contents of Pb within Yujia profile at Daqiao mire are 1.81～7.35μg/g,and average value is 4.24μg/g.The enrichment factors in the upper section of the profile（0～60cm,correspond to 0～1 300a（B.P.））are more than 1,while less than 1in the bottom section of the profile.It seems to indicate a weak lead move in profile.The range of the lead accumulation rates in Yujia profile is from 0.54 mg/（m^2·a）to 4.97 mg/（m^2·a）,and it becomes smaller with the depth decreasing.The lead accumulation rates and atmospheric dust accumulation rates show a significant positive correlation（r=0.948,n=14,P〈0.01）.It means Pb mainly comes from the atmospheric dust.The lead accumulation rates and lithogenic lead concentrations also show a significant positive correlation（r=0.784,n=14,P〈0.01）,indicating less lead contamination caused by human activity.The total accumulative,anthropogenic lead in Daqiao mires is 0.729 3g/m^2.The enrichment factors of lead in the Yujia profile reveal the most enrichment occured since 530a（B.P.）.

关 键 词：富营养泥炭 大气铅沉降 环境变化 铅污染 

分 类 号：P531[天文地球—古生物学与地层学]