气候和地热共同影响泥炭地表面湿度变化——以长白山赤池泥炭地为例  

Mire surface wetness is jointly determined by climate and geothermy:A case from Chichi peatland in the Changbai Mountains

作　　者：刘莉 赵红艳[1,2,3] 李鸿凯 卜兆君[1,2,3] 王升忠 LIU Li;ZHAO Hongyan;LI Hongkai;BU Zhaojun;WANG Shengzhong(Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains,Ministry of Education,School of Geographical Science,Northeast Normal University,Changchun 130024,Jilin;State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration,Institute for Peat and Mire Research,Northeast Normal University,Changchun 130024,Jilin;Jilin Provincial Key Laboratory for Wetland Ecological Processes and Environmental Change in the Changbai Mountains,Changchun 130024,Jilin)

机构地区：[1]东北师范大学地理科学学院,长白山地理过程与生态安全教育部重点实验室,吉林长春130024 [2]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,吉林长春130024 [3]吉林省长白山湿地生态过程与环境变化重点实验室,吉林长春130024

出　　处：《第四纪研究》2023年第1期163-172,共10页Quaternary Sciences

基　　金：国家自然科学基金项目(批准号:42071104)资助。

摘　　要：来自北方泥炭地的研究表明,沼泽表面湿度变化时常受控于气候变化。然而火山活动区泥炭地的表面湿度是否受到了火山地质的影响?这个问题值得进一步明晰。本研究以长白山赤池泥炭地38cm深的沉积物作为对象,通过植物大化石、有壳变形虫和腐殖化度多指标分析,重建该泥炭地过去近50年的地表湿度变化。研究表明,3个指标揭示的地表湿度变化趋势总体一致,即38~27cm(1957~1965A.D.)由干向湿转变;27~18cm(1965~1976A.D.)干湿波动;18~0cm(1976~2008A.D.)由湿向干转变。与当地的气象数据对比,发现剖面底部湿度偏低与地热引起的强烈蒸发有关;而剖面上部湿度偏低与降水少、温度高的气候变化模式较吻合。理解泥炭地表面湿度变化对于泥炭记录的古气候、古环境和古生态重建具有重要意义。Peatlands record the changes in climate and environment during their formation and development as one of the major geological archives.Previous studies from boreal peatlands suggest that natural changes in bog surface wetness(BSW)are often controlled by climate change.However,the influence of volcanic activities on BSW in peatlands from the volcanically active regions has not been sufficiently addressed.In this paper,Chichi peatland(42°03'16''N,128°03'22''E;1811m a.s.l.)in the Changbai Mountains,northeast of China was investigated.A monolith of peat(38cm in depth)was excavated from the centre of Chichi peatland in 2008 and was cut into peat slice at 1cm(depth)intervals on site.Analyses of plant macrofossils,testate amoebae and peat humification have been combined to reconstruct BSW with the support of AMS 14C technology.Detrended correspondence analysis on plant macrofossils was used to transform the raw floral data into BSW indices.A testate amoebae-depth to water table(DWT)transfer function developed for this region was used to reconstruct past DWT.Results showed that reconstructed BSW from plant macrofossils was generally consistent in trend with those from testate amoebae and peat humification.Bog surface wetness was drier from 1957A.D.to 1965A.D.,fluctuated from dry to wet from 1965A.D.to 1976A.D.,and then converted into dry from 1976A.D.to 2008A.D.Comparisons of the BSW reconstruction with meteorological data from both this peatland and Erdao meteorological station near this peatland suggested that relatively dry surface at the bottom of the profile was predominantly associated with strong evaporation caused by geothermal heat,increase in wetness at the middle of the profile due to the weakening role of geothermal heat and strengthening of climate influence,and decrease in wetness at the upper part of the profile induced by less precipitation and higher temperature.The research on reconstruction of BSW and its mechanisms is significant for reconstruction of palaeoclimate,palaeoenvironment and palaeoecolog

关 键 词：长白山 植物大化石 有壳变形虫 沼泽表面湿度 气候变化 

分 类 号：P467[天文地球—大气科学及气象学]