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

Bibliographische Detailangaben
Veröffentlicht in:	Global change biology. - 1999. - 29(2023), 5 vom: 16. März, Seite 1267-1281
1. Verfasser:	Zona, Donatella (VerfasserIn)
Weitere Verfasser:	Lafleur, Peter M, Hufkens, Koen, Gioli, Beniamino, Bailey, Barbara, Burba, George, Euskirchen, Eugénie S, Watts, Jennifer D, Arndt, Kyle A, Farina, Mary, Kimball, John S, Heimann, Martin, Göckede, Mathias, Pallandt, Martijn, Christensen, Torben R, Mastepanov, Mikhail, López-Blanco, Efrén, Dolman, Albertus J, Commane, Roisin, Miller, Charles E, Hashemi, Josh, Kutzbach, Lars, Holl, David, Boike, Julia, Wille, Christian, Sachs, Torsten, Kalhori, Aram, Humphreys, Elyn R, Sonnentag, Oliver, Meyer, Gesa, Gosselin, Gabriel H, Marsh, Philip, Oechel, Walter C
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2023
Zugriff auf das übergeordnete Werk:	Global change biology
Schlagworte:	Journal Article carbon loss climate change drying permafrost tundra Soil Carbon Dioxide 142M471B3J Carbon 7440-44-0

Beschreibung
Zusammenfassung:	© 2022 The Authors. Global Change Biology published by John Wiley & Sons Ltd. 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
Beschreibung:	Date Completed 06.02.2023 Date Revised 25.05.2023 published: Print-Electronic CommentIn: Glob Chang Biol. 2023 Mar;29(5):1217-1219. - PMID 36357716 Citation Status MEDLINE
ISSN:	1365-2486
DOI:	10.1111/gcb.16487