首页|Carbon allocation in Picea jezoensis:Adaptation strategies of a non-treeline species at its upper elevation limit

Carbon allocation in Picea jezoensis:Adaptation strategies of a non-treeline species at its upper elevation limit

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  • 国家科技期刊平台
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Understanding the physiological adaptations of non-treeline trees to environmental stress is important to un-derstand future shifts in species composition and distribution of current treeline ecotone.The aim of the present study was to elucidate the mechanisms of the formation of the upper elevation limit of non-treeline tree species,Picea jezoensis,and the carbon allocation strategies of the species on Changbai Mountain.We employed the 13C in situ pulse labeling technique to trace the distribution of photosynthetically assimilated carbon in Picea jezoensis at different elevational positions(tree species at its upper elevation limit(TSAUE,1,700 m a.s.l.)under treeline ecotone;tree species at a lower elevation position(TSALE,1,400 m a.s.l.).We analyzed 13C and the non-structural carbohydrate(NSC)concentrations in various tissues following labeling.Our findings revealed a significant shift in carbon allocation in TSAUE compared to TSALE.There was a pronounced increase in δ13C allocation to belowground components(roots,soil,soil respiration)in TSAUE compared to TSALE.Furthermore,the C flow rate within the plant-soil-atmosphere system was faster,and the C residence time in the plant was shorter in TSAUE.The trends indicate enhanced C sink activity in belowground tissues in TSAUE,with newly assimilated C being preferentially directed there,suggesting a more conservative C allocation strategy by P.jezoensis at higher elevations under harsher environments.Such a strategy,prioritizing C storage in roots,likely aids in withstanding winter cold stress at the expense of aboveground growth during the growing season,leading to reduced growth of TSAUE compared to TSALE.The results of the present study shed light on the adaptive mechanisms governing the upper elevation limits of non-treeline trees,and enhances our understanding of how non-treeline species might respond to ongoing climate change.

13C pulse labelingCarbon distributionNon-structural carbohydrates(NSC)Non-treeline speciesSink activityStressful environmentsUpper elevation limit

Renkai Dong、Na Li、Mai-He Li、Yu Cong、Haibo Du、Decai Gao、Hong S.He

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Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains,Ministry of Education,School of Geographical Sciences,Northeast Normal University,Changchun,130024,China

Swiss Federal Institute for Forest,Snow and Landscape Research WSL,8903,Birmensdorf,Switzerland

School of Life Science,Hebei University,Baoding,071002,China

Northeast Institute of Geography and Agricultural Ecology,Chinese Academy of Sciences,Changchun,130102,China

School of Natural Resources,University of Missouri,Columbia,MO,65211,USA

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Jilin Province,ChinaNatural Science Foundation of Jilin Province,China

42371052422711004197112442371095YDZJ202201ZYTS483YDZJ202201ZYTS470

2024

10.1016/j.fecs.2024.100188

森林生态系统(英文版)
北京林业大学

森林生态系统(英文版)

CSTPCD
影响因子：0.09
ISSN：2095-6355
年,卷(期)：2024.11(3)
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