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Research article - Peer-reviewed, 2021

Methane Emissions Offset Net Carbon Dioxide Uptake From an Alpine Peatland on the Eastern Qinghai-Tibetan Plateau

Peng, Haijun; Chi, Jinshu; Yao, Hu; Guo, Qian; Hong, Bing; Ding, Hanwei; Zhu, Yongxuan; Wang, Jie; Hong, Yetang

Abstract

Peatlands store large amounts of carbon (C) and actively exchange greenhouse gases (GHGs) with the atmosphere, thus significantly affecting global C cycle and climate. Large uncertainty exists in C and GHG estimates of the alpine peatlands on Qinghai-Tibetan Plateau (QTP), as direct measurements of CO2 and CH4 fluxes are scarce in this region. In this study, we provided 32-month CO2 and CH4 fluxes measured using the eddy covariance (EC) technique in a typical alpine peatland on the eastern QTP to estimate the net C and CO2 equivalent (CO2-eq) fluxes and investigate their environmental controls. Our results showed that the mean annual CO2 and CH4 fluxes were -68 +/- 8 g CO2-C m(-2) yr(-1) and 35 +/- 0.3 g CH4-C m(-2) yr(-1), respectively. While considering the traditional and sustained global warming potentials of CH4 over the 100-year timescale, the peatland acted as a net CO2-eq source (1,059 +/- 30 and 1,853 +/- 31 g CO2-eq m(-2) yr(-1), respectively). The net CO2-eq emissions during the non-growing seasons contributed to over 40% of the annual CO2-eq budgets. We further found that net CO2-eq flux was primarily influenced by global radiation and soil temperature variations. This study was the first assessment to quantify the net CO2-eq flux of the alpine peatland in the QTP region using EC measurements. Our study highlights that CH4 emissions from the alpine peatlands can largely offset the net cooling effect of CO2 uptake and future climate changes such as global warming might further enhance their potential warming effect.

Keywords

peatlands; radiative forcing; greenhouse gas fluxes; carbon budgets; eddy covariance; Qinghai-Tibetan Plateau

Published in

Journal of geophysical research. Atmospheres
2021, volume: 126, number: 19, article number: e2021JD034671
Publisher: AMER GEOPHYSICAL UNION

Authors' information

Peng, Haijun
Guiyang Institute of Geochemistry, CAS
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Chi, Jinshu
Swedish University of Agricultural Sciences, Department of Forest Ecology and Management
Yao, Hu
University of Chinese Academy of Sciences, CAS
Yao, Hu
Guiyang Institute of Geochemistry, CAS
Guo, Qian
University of Chinese Academy of Sciences, CAS
Guo, Qian
Guiyang Institute of Geochemistry, CAS
Hong, Bing
University of Chinese Academy of Sciences, CAS
Hong, Bing
Guiyang Institute of Geochemistry, CAS
Ding, Hanwei
University of Chinese Academy of Sciences, CAS
Ding, Hanwei
Guiyang Institute of Geochemistry, CAS
Zhu, Yongxuan
Guiyang Institute of Geochemistry, CAS
Wang, Jie
University of Chinese Academy of Sciences, CAS
Wang, Jie
Guiyang Institute of Geochemistry, CAS
Hong, Yetang
Guiyang Institute of Geochemistry, CAS

UKÄ Subject classification

Meteorology and Atmospheric Sciences

Publication Identifiers

DOI: https://doi.org/10.1029/2021JD034671

URI (permanent link to this page)

https://res.slu.se/id/publ/114169