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Earlier snowmelt may lead to late season declines in plant productivity and carbon sequestration in Arctic tundra ecosystems

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  • Donatella Zona, San Diego State University, University of Sheffield
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  • Peter M. Lafleur, Trent University
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  • Koen Hufkens, Institut National de la Recherche Agronomique, Ghent University
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  • Barbara Bailey, San Diego State University
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  • Beniamino Gioli, CNR
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  • George Burba, LI-COR, University of Nebraska-Lincoln
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  • Jordan P. Goodrich, University of Waikato
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  • Anna K. Liljedahl, University of Alaska Fairbanks, Woodwell Climate Research Center, Inc.
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  • Eugénie S. Euskirchen, University of Alaska Fairbanks
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  • Jennifer D. Watts, Woodwell Climate Research Center, Inc., University of Montana
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  • Mary Farina, Woodwell Climate Research Center, Inc.
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  • John S. Kimball, University of Montana
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  • Martin Heimann, Max Planck Institute for Biogeochemistry, University of Helsinki
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  • Mathias Göckede, Max Planck Institute for Biogeochemistry
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  • Martijn Pallandt, Max Planck Institute for Biogeochemistry
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  • Torben R. Christensen
  • Mikhail Mastepanov
  • Efrén López-Blanco
  • Marcin Jackowicz-Korczynski
  • Albertus J. Dolman, Royal Netherlands Institute for Sea Research - NIOZ
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  • Luca Belelli Marchesini, Istituto Agrario San Michele all'Adige, People's Friendship University of Russia
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  • Roisin Commane, Columbia University
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  • Steven C. Wofsy, Harvard University
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  • Charles E. Miller, Jet Propulsion Laboratory, California Institute of Technology
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  • David A. Lipson, San Diego State University
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  • Josh Hashemi, San Diego State University
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  • Kyle A. Arndt, University of New Hampshire
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  • Lars Kutzbach, University of Hamburg
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  • David Holl, University of Hamburg
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  • Julia Boike, Alfred Wegener Institute - Helmholtz Centre for Polar and Marine Research, Humboldt University of Berlin
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  • Christian Wille, Helmholtz Centre Potsdam - German Research Centre for Geosciences
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  • Torsten Sachs, Helmholtz Centre Potsdam - German Research Centre for Geosciences
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  • Aram Kalhori, Helmholtz Centre Potsdam - German Research Centre for Geosciences
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  • Xia Song, San Diego State University
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  • Xiaofeng Xu, San Diego State University
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  • Elyn R. Humphreys, Carleton University
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  • Charles D. Koven, Lawrence Berkeley National Laboratory
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  • Oliver Sonnentag, University of Montreal
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  • Gesa Meyer, University of Montreal
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  • Gabriel H. Gosselin, University of Montreal
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  • Philip Marsh, Wilfrid Laurier University
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  • Walter C. Oechel, San Diego State University, University of Exeter

Arctic warming is affecting snow cover and soil hydrology, with consequences for carbon sequestration in tundra ecosystems. The scarcity of observations in the Arctic has limited our understanding of the impact of covarying environmental drivers on the carbon balance of tundra ecosystems. In this study, we address some of these uncertainties through a novel record of 119 site-years of summer data from eddy covariance towers representing dominant tundra vegetation types located on continuous permafrost in the Arctic. Here we found that earlier snowmelt was associated with more tundra net CO2 sequestration and higher gross primary productivity (GPP) only in June and July, but with lower net carbon sequestration and lower GPP in August. Although higher evapotranspiration (ET) can result in soil drying with the progression of the summer, we did not find significantly lower soil moisture with earlier snowmelt, nor evidence that water stress affected GPP in the late growing season. Our results suggest that the expected increased CO2 sequestration arising from Arctic warming and the associated increase in growing season length may not materialize if tundra ecosystems are not able to continue sequestering CO2 later in the season.

OriginalsprogEngelsk
Artikelnummer3986
TidsskriftScientific Reports
Vol/bind12
Nummer1
Antal sider10
ISSN2045-2322
DOI
StatusUdgivet - mar. 2022

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