气候变化领域集成服务门户(CCPortal): Methane Emissions Offset Net Carbon Dioxide Uptake From an Alpine Peatland on the Eastern Qinghai-Tibetan Plateau

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DOI	10.1029/2021JD034671
	Methane Emissions Offset Net Carbon Dioxide Uptake From an Alpine Peatland on the Eastern Qinghai-Tibetan Plateau
	Peng H.; Chi J.; Yao H.; Guo Q.; Hong B.; Ding H.; Zhu Y.; Wang J.; Hong Y.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:19
英文摘要	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. © 2021. The Authors.
英文关键词	carbon budgets; eddy covariance; greenhouse gas fluxes; peatlands; Qinghai-Tibetan Plateau; radiative forcing
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236974
作者单位	State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; Bayinbuluk Alpine Wetland Carbon Flux Research Station, Chinese Flux Observation and Research Network, Beijing, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, China; University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Peng H.,Chi J.,Yao H.,et al. Methane Emissions Offset Net Carbon Dioxide Uptake From an Alpine Peatland on the Eastern Qinghai-Tibetan Plateau[J],2021,126(19).
APA	Peng H..,Chi J..,Yao H..,Guo Q..,Hong B..,...&Hong Y..(2021).Methane Emissions Offset Net Carbon Dioxide Uptake From an Alpine Peatland on the Eastern Qinghai-Tibetan Plateau.Journal of Geophysical Research: Atmospheres,126(19).
MLA	Peng H.,et al."Methane Emissions Offset Net Carbon Dioxide Uptake From an Alpine Peatland on the Eastern Qinghai-Tibetan Plateau".Journal of Geophysical Research: Atmospheres 126.19(2021).