Earlier snowmelt may lead to late season declines in plant productivity and carbon sequestration in Arctic tundra ecosystems
Donatella Zona
(1, 2)
,
Peter Lafleur
(3)
,
Koen Hufkens
(4, 5)
,
Barbara Bailey
(1)
,
Beniamino Gioli
(6)
,
George Burba
(7)
,
Jordan Goodrich
(8)
,
Anna Liljedahl
(9)
,
Eugénie Euskirchen
(10)
,
Jennifer Watts
(11)
,
Mary Farina
(12)
,
John Kimball
(11)
,
Martin Heimann
(13)
,
Mathias Göckede
(14)
,
Martijn Pallandt
(14)
,
Torben Christensen
(15)
,
Mikhail Mastepanov
(15)
,
Efrén López-Blanco
(15)
,
Marcin Jackowicz-Korczynski
(15)
,
Albertus Dolman
(16)
,
Luca Belelli Marchesini
(17)
,
Roisin Commane
(18)
,
Steven Wofsy
(19)
,
Charles Miller
(20)
,
David Lipson
(1)
,
Josh Hashemi
(1)
,
Kyle Arndt
(21)
,
Lars Kutzbach
(22)
,
David Holl
(22)
,
Julia Boike
(22)
,
Christian Wille
(23)
,
Torsten Sachs
(23)
,
Aram Kalhori
(23)
,
Xia Song
(1)
,
Xiaofeng Xu
(1)
,
Elyn Humphreys
(24)
,
Charles Koven
(25)
,
Oliver Sonnentag
(26)
,
Gesa Meyer
(26)
,
Gabriel Gosselin
(26)
,
Philip Marsh
(27)
,
Walter Oechel
(1)
1
SDSU -
San Diego State University
2 University of Sheffield [Sheffield]
3 Trent University
4 UGENT - Universiteit Gent = Ghent University
5 UMR ISPA - Interactions Sol Plante Atmosphère
6 IBE | CNR - Institute for BioEconomy [Sesto Fiorentino]
7 University of Nebraska–Lincoln
8 University of Waikato [Hamilton]
9 UAF - University of Alaska [Fairbanks]
10 Institute of Arctic Biology
11 University of Montana
12 Woodwell Climate Research Center
13 MPI-BGC - Max-Planck-Institut für Biogeochemie
14 MPI-BGC - Max Planck Institute for Biogeochemistry
15 Aarhus University [Aarhus]
16 VU - Vrije Universiteit Amsterdam [Amsterdam]
17 RUDN - Peoples Friendship University of Russia [RUDN University]
18 Columbia University [New York]
19 Harvard University
20 JPL - Jet Propulsion Laboratory
21 UNH - University of New Hampshire
22 UHH - Universität Hamburg
23 GFZ - German Research Centre for Geosciences - Helmholtz-Centre Potsdam
24 Carleton University
25 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
26 UdeM - Université de Montréal
27 WLU - Wilfrid Laurier University
2 University of Sheffield [Sheffield]
3 Trent University
4 UGENT - Universiteit Gent = Ghent University
5 UMR ISPA - Interactions Sol Plante Atmosphère
6 IBE | CNR - Institute for BioEconomy [Sesto Fiorentino]
7 University of Nebraska–Lincoln
8 University of Waikato [Hamilton]
9 UAF - University of Alaska [Fairbanks]
10 Institute of Arctic Biology
11 University of Montana
12 Woodwell Climate Research Center
13 MPI-BGC - Max-Planck-Institut für Biogeochemie
14 MPI-BGC - Max Planck Institute for Biogeochemistry
15 Aarhus University [Aarhus]
16 VU - Vrije Universiteit Amsterdam [Amsterdam]
17 RUDN - Peoples Friendship University of Russia [RUDN University]
18 Columbia University [New York]
19 Harvard University
20 JPL - Jet Propulsion Laboratory
21 UNH - University of New Hampshire
22 UHH - Universität Hamburg
23 GFZ - German Research Centre for Geosciences - Helmholtz-Centre Potsdam
24 Carleton University
25 LBNL - Lawrence Berkeley National Laboratory [Berkeley]
26 UdeM - Université de Montréal
27 WLU - Wilfrid Laurier University
Roisin Commane
- Fonction : Auteur
- PersonId : 763888
- ORCID : 0000-0003-1373-1550
Julia Boike
- Fonction : Auteur
- PersonId : 761795
- ORCID : 0000-0002-5875-2112
- IdRef : 124143954
Torsten Sachs
- Fonction : Auteur
- PersonId : 757116
- ORCID : 0000-0002-9959-4771
Xiaofeng Xu
- Fonction : Auteur
- PersonId : 792048
- ORCID : 0000-0002-6553-6514
Charles Koven
- Fonction : Auteur
- PersonId : 791750
- ORCID : 0000-0002-3367-0065
Résumé
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.
Domaines
Sciences de l'environnement
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