Nonlinear CO2 flux response to 7 years of experimentally induced permafrost thaw

Nonlinear CO2 flux response to 7 years of experimentally induced permafrost thaw

© 2017 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 23(2017), 9 vom: 30. Sept., Seite 3646-3666
1. Verfasser: Mauritz, Marguerite (VerfasserIn)
Weitere Verfasser: Bracho, Rosvel, Celis, Gerardo, Hutchings, Jack, Natali, Susan M, Pegoraro, Elaine, Salmon, Verity G, Schädel, Christina, Webb, Elizabeth E, Schuur, Edward A G
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Arctic carbon ecosystem respiration experimental warming gross primary productivity net ecosystem exchange permafrost thaw tundra mehr... Soil Carbon Dioxide 142M471B3J
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245 1 0 |a Nonlinear CO2 flux response to 7 years of experimentally induced permafrost thaw 
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520 |a Rapid Arctic warming is expected to increase global greenhouse gas concentrations as permafrost thaw exposes immense stores of frozen carbon (C) to microbial decomposition. Permafrost thaw also stimulates plant growth, which could offset C loss. Using data from 7 years of experimental Air and Soil warming in moist acidic tundra, we show that Soil warming had a much stronger effect on CO2 flux than Air warming. Soil warming caused rapid permafrost thaw and increased ecosystem respiration (Reco ), gross primary productivity (GPP), and net summer CO2 storage (NEE). Over 7 years Reco , GPP, and NEE also increased in Control (i.e., ambient plots), but this change could be explained by slow thaw in Control areas. In the initial stages of thaw, Reco , GPP, and NEE increased linearly with thaw across all treatments, despite different rates of thaw. As thaw in Soil warming continued to increase linearly, ground surface subsidence created saturated microsites and suppressed Reco , GPP, and NEE. However Reco and GPP remained high in areas with large Eriophorum vaginatum biomass. In general NEE increased with thaw, but was more strongly correlated with plant biomass than thaw, indicating that higher Reco in deeply thawed areas during summer months was balanced by GPP. Summer CO2 flux across treatments fit a single quadratic relationship that captured the functional response of CO2 flux to thaw, water table depth, and plant biomass. These results demonstrate the importance of indirect thaw effects on CO2 flux: plant growth and water table dynamics. Nonsummer Reco models estimated that the area was an annual CO2 source during all years of observation. Nonsummer CO2 loss in warmer, more deeply thawed soils exceeded the increases in summer GPP, and thawed tundra was a net annual CO2 source 
650 4 |a Journal Article 
650 4 |a Arctic 
650 4 |a carbon 
650 4 |a ecosystem respiration 
650 4 |a experimental warming 
650 4 |a gross primary productivity 
650 4 |a net ecosystem exchange 
650 4 |a permafrost 
650 4 |a thaw 
650 4 |a tundra 
650 7 |a Soil  |2 NLM 
650 7 |a Carbon Dioxide  |2 NLM 
650 7 |a 142M471B3J  |2 NLM 
700 1 |a Bracho, Rosvel  |e verfasserin  |4 aut 
700 1 |a Celis, Gerardo  |e verfasserin  |4 aut 
700 1 |a Hutchings, Jack  |e verfasserin  |4 aut 
700 1 |a Natali, Susan M  |e verfasserin  |4 aut 
700 1 |a Pegoraro, Elaine  |e verfasserin  |4 aut 
700 1 |a Salmon, Verity G  |e verfasserin  |4 aut 
700 1 |a Schädel, Christina  |e verfasserin  |4 aut 
700 1 |a Webb, Elizabeth E  |e verfasserin  |4 aut 
700 1 |a Schuur, Edward A G  |e verfasserin  |4 aut 
773 0 8 |i Enthalten in  |t Global change biology  |d 1999  |g 23(2017), 9 vom: 30. Sept., Seite 3646-3666  |w (DE-627)NLM098239996  |x 1365-2486  |7 nnns 
773 1 8 |g volume:23  |g year:2017  |g number:9  |g day:30  |g month:09  |g pages:3646-3666 
856 4 0 |u http://dx.doi.org/10.1111/gcb.13661  |3 Volltext 
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