首页|Changes in net ecosystem exchange of CO2 in Arctic and their relationships with climate change during 2002-2017

Changes in net ecosystem exchange of CO2 in Arctic and their relationships with climate change during 2002-2017

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Arctic wanning leads to permafrost degradation,which can increase ecosystem respiration and release more greenhouse gas into the at-mosphere.Meanwhile,climate warming also promotes the plant growth and increases carbon assimilation.Presently,it is largely unknown about the carbon budget and their responses to climate change in the Arctic regions.In this study,to investigate the seasonal and annual net ecosystem carbon exchange (NEE),we collected 71 observation stations for net ecosystem exchange (NEE) of CO2 in the high latitude permafrost regions during 2002-2017.The results showed that the annual NEE was-8.2 ± 4.1 g CO2 m-2 d-1 for forest,-3.3 ± 2.6 g CO2 m-2 d-1 for shrub,-4.8 ± 4.1 g CO2 m-2 d-1 for grassland,-3.6 ± 3.0 g CO2 m-2 d-1 for wetland and 0.02 ± 0.62 g CO2 m-2 d-1 for tundra,respectively.From 2002 to 2017,the CO2 emissions of grassland (carbon source) showed a decreasing trend,and the CO2 assimilation of shrub and forest (carbon sink) has been increased.The wetland and tundra are shifting from carbon sources to sinks.There were great variations in temperature sen-sitivities (Q10) of NEE in different seasons,with larger values in winter and lower values in summer.These findings indicate that the Arctic terrestrial ecosystem presently acts as a carbon sink,while there is a possibility that future warming,especially the warming in winter,may decrease the carbon sink of the Arctic terrestrial ecosystem.

ArcticClimate changePermafrostCarbon fluxEcosystemEddy covariance

LI Zhi-Long、MU Cui-Cui、CHEN Xu、WANG Xing-Yu、DONG Wen-Wen、JIA Lin、MU Mei、Irina STRELETSKAYA、Valery GREBENETS、Sergey SOKRATOV、Alexander KIZYAKOV、WU Xiao-Dong

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Key Laboratory of Western China's Environmental Systems (Ministry of Education),College of Earth and Environmental Sciences,Lanzhou University,Lanzhou,730000,China

Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai),Zhuhai,519000,China

Cryosphere Research Station on the Qinghai-Tibetan Plateau,State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resource,Chinese Academy of Sciences,Lanzhou,730000,China

University Cooperation of Polar Research,Beijing,10087

Geographical Faculty,Lomonosov Moscow State University,Moscow,119991,Russia

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2019YFA0607003419410153206114303218-05-60080N AAAA-A16-116032810095-6

2021

气候变化研究进展(英文版)
国家气候中心

气候变化研究进展(英文版)

CSCDSCI
影响因子：0.806
ISSN：1674-9278
年,卷(期)：2021.12(4)
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