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Pan-Arctic soil moisture control on tundra carbon sequestration and plant productivity

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

DOI

  • Donatella Zona, San Diego State University, University of Sheffield
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  • Peter M. Lafleur, Trent University
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  • Koen Hufkens, BlueGreen Labs
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  • Beniamino Gioli, Consiglio Nazionale delle Ricerche
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  • Barbara Bailey, San Diego State University
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  • George Burba, LI-COR, University of Nebraska-Lincoln
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  • Eugénie S. Euskirchen, University of Alaska Fairbanks
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  • Jennifer D. Watts, Woodwell Climate Research Centre, University of Montana
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  • Kyle A. Arndt, Woodwell Climate Research Centre
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  • Mary Farina, Woodwell Climate Research Centre
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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
  • Albertus J. Dolman, Royal Netherlands Institute for Sea Research - NIOZ
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  • Roisin Commane, Columbia University
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  • Charles E. Miller, California Institute of Technology
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  • Josh Hashemi, San Diego State University, University of Freiburg
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  • Lars Kutzbach, University of Hamburg
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  • David Holl, University of Hamburg
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  • Julia Boike, Humboldt-Universität zu Berlin, Helmholtz-Gemeinschaft Deutscher Forschungszentren
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  • Christian Wille, Helmholtz-Gemeinschaft Deutscher Forschungszentren
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  • Torsten Sachs, Helmholtz-Gemeinschaft Deutscher Forschungszentren
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  • Aram Kalhori, Helmholtz-Gemeinschaft Deutscher Forschungszentren
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  • Elyn R. Humphreys, Carleton University
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  • Oliver Sonnentag, Université de Montréal
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  • Gesa Meyer, Université de Montréal
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  • Gabriel H. Gosselin, Université de Montréal
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  • Philip Marsh, Wilfrid Laurier University
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  • Walter C. Oechel, San Diego State University

Long-term atmospheric CO2 concentration records have suggested a reduction in the positive effect of warming on high-latitude carbon uptake since the 1990s. A variety of mechanisms have been proposed to explain the reduced net carbon sink of northern ecosystems with increased air temperature, including water stress on vegetation and increased respiration over recent decades. However, the lack of consistent long-term carbon flux and in situ soil moisture data has severely limited our ability to identify the mechanisms responsible for the recent reduced carbon sink strength. In this study, we used a record of nearly 100 site-years of eddy covariance data from 11 continuous permafrost tundra sites distributed across the circumpolar Arctic to test the temperature (expressed as growing degree days, GDD) responses of gross primary production (GPP), net ecosystem exchange (NEE), and ecosystem respiration (ER) at different periods of the summer (early, peak, and late summer) including dominant tundra vegetation classes (graminoids and mosses, and shrubs). We further tested GPP, NEE, and ER relationships with soil moisture and vapor pressure deficit to identify potential moisture limitations on plant productivity and net carbon exchange. Our results show a decrease in GPP with rising GDD during the peak summer (July) for both vegetation classes, and a significant relationship between the peak summer GPP and soil moisture after statistically controlling for GDD in a partial correlation analysis. These results suggest that tundra ecosystems might not benefit from increased temperature as much as suggested by several terrestrial biosphere models, if decreased soil moisture limits the peak summer plant productivity, reducing the ability of these ecosystems to sequester carbon during the summer.

OriginalsprogEngelsk
TidsskriftGlobal change biology
Vol/bind29
Nummer5
Sider (fra-til)1267-1281
Antal sider15
ISSN1354-1013
DOI
StatusUdgivet - mar. 2023

Bibliografisk note

Publisher Copyright:
Global Change Biology© 2022 The Authors. Global Change Biology published by John Wiley & Sons Ltd.

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