The development process of a temperate montane peatland and its controlling factors since the middle Holocene  

作　　者：Yanmin DONG Hongkai LI Shengzhong WANG Hongshi HE 

机构地区：[1]Key Laboratory of Geographical Process 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,Northeast Normal University,Changchun 130024,China [3]School of Natural Resources,University of Missouri,MO 65211,USA

出　　处：《Science China Earth Sciences》2023年第3期594-608,共15页中国科学（地球科学英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2016YFC0500407);the National Natural Science Foundation of China(Grant Nos.41771217 and 32071599)。

摘　　要：Peatlands are some of the largest carbon reservoirs in terrestrial ecosystems and play a key role in the global carbon cycle.Understanding peatland development,carbon accumulation processes,and the peatland response to varying forcing factors over different temporal and spatial scales helps reveal the underlying processes and general patterns of these ecosystems.To assess the role of climate and local conditions in peatland development,the basal samples from 23 peat cores and three well dated long peat cores were used to explore peatland initiation,lateral expansion,and carbon accumulation rate in the Baijianghe peatland located in the Changbai Mountains,Northeast China.Our results reveal that the Baijianghe peatland was initiated from forest conditions at 7.9 cal.kyr BP and then expanded laterally by paludification.The rapid expansion between 5 and4 cal.kyr BP likely resulted from high precipitation and gentle topography.The mean carbon accumulation rates of the three long peat cores were 36.3,39.1 and 48.4 g C m^(-2)yr^(-1),respectively,which are higher than rates from the northern peatlands.Both climate and local conditions have exerted an important influence on carbon accumulation rates in the Baijianghe peatland since the middle Holocene.The carbon accumulation patterns between 5 and 1.5 cal.kyr BP were probably linked to local conditions rather than climatic settings,including topography,hydrological conditions,and plant composition.The consistently decreasing carbon accumulation rate values at all locations within the BJH peatland over the last 1.5 cal.kyr BP suggests that climate is the primary control.This study highlights the varying primary controls on the process of peatland development and reveals the important role of local conditions in carbon accumulation.

关 键 词：Paludification Peatland lateral expansion Carbon accumulation rate Northeast China Middle Holocene 

分 类 号：X171.1[环境科学与工程—环境科学] P534.632[天文地球—第四纪地质学]