Holocene initiation and expansion of the southern margins of northern peatlands triggered by the East Asian summer monsoon recession  

作　　者：Mingming Zhang John P.Smol Zhaojun Bu 

机构地区：[1]Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains,Ministry of Education,School of Geographical Sciences,Northeast Normal University,Changchun 130024,China [2]State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration,Institute for Peat and Mire Research,Northeast Normal University,Changchun 130024,China [3]Jilin Provincial Key Laboratory for Wetland Ecological Processes and Environmental Change in the Changbai Mountains,Changchun 130024,China [4]Paleoecological Environmental Assessment and Research Laboratory,Department of Biology,Queen’s University,Kingston,ON K7L 3N6,Canada

出　　处：《Geoscience Frontiers》2023年第2期256-267,共12页地学前缘（英文版）

基　　金：supported by the Science and Technology Development Plan of Jilin Province(Grant No.YDZJ202201-ZYTS471);the National Natural Science Foundation of China(Grant No.42071121);supported by“the Fundamental Research Funds for the Central Universities”(Grant No.2412022ZD023).

摘　　要：Northern peatlands represent one of the largest biospheric carbon reservoirs in the world.Their southern margins act as new carbon reservoirs,which can greatly influence the global carbon dynamics.However,the Holocene initiation,expansion and climate sensitivity of these peatlands remain intensely debated.Here we used a compilation of basal peat ages across six isolated peatlands at the southern margins of northern peatlands to address these issues.We found that the earliest initiation event of these peatlands occurred after the Younger Dryas(YD,12,800–11,700 years ago)period.The second initiation event and rapid expansion occurred since 5 ka cal.BP.The recession of East Asian summer monsoon(EASM)during the YD period and at around 5 ka cal.BP likely played a major role in controlling the initiation and expansion of these peatlands.The rapid expansion of these peatlands possibly contributed to the significant increases in atmospheric methane concentrations during the late Holocene because of the minerotrophic fens status and rapid expansion of them.These ecological processes are different from northern peatlands,indicating the special carbon sink and source implications of these peatlands in the global carbon cycle.

关 键 词：Initiation and expansion Northern peatlands East Asian summer monsoon recession ENSO activities Atmospheric methane concentrations 

分 类 号：P534.4[天文地球—古生物学与地层学] P588.11[天文地球—地质学] P597.3