Temperature, moisture and freeze–thaw controls on CO2 production in soil incubations from northern peatlands

Abstract Peat accumulation in high latitude wetlands represents a natural long-term carbon sink, resulting from the cumulative excess of growing season net ecosystem production over non-growing season (NGS) net mineralization in soils. With high latitudes experiencing warming at a faster pace than t...

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Autores principales:	Eunji Byun, Fereidoun Rezanezhad, Linden Fairbairn, Stephanie Slowinski, Nathan Basiliko, Jonathan S. Price, William L. Quinton, Pascale Roy-Léveillée, Kara Webster, Philippe Van Cappellen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e3b50d438dce4e8b911779748232308e
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spelling	oai:doaj.org-article:e3b50d438dce4e8b911779748232308e2021-12-05T12:13:34ZTemperature, moisture and freeze–thaw controls on CO2 production in soil incubations from northern peatlands10.1038/s41598-021-02606-32045-2322https://doaj.org/article/e3b50d438dce4e8b911779748232308e2021-12-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-02606-3https://doaj.org/toc/2045-2322Abstract Peat accumulation in high latitude wetlands represents a natural long-term carbon sink, resulting from the cumulative excess of growing season net ecosystem production over non-growing season (NGS) net mineralization in soils. With high latitudes experiencing warming at a faster pace than the global average, especially during the NGS, a major concern is that enhanced mineralization of soil organic carbon will steadily increase CO2 emissions from northern peatlands. In this study, we conducted laboratory incubations with soils from boreal and temperate peatlands across Canada. Peat soils were pretreated for different soil moisture levels, and CO2 production rates were measured at 12 sequential temperatures, covering a range from − 10 to + 35 °C including one freeze–thaw event. On average, the CO2 production rates in the boreal peat samples increased more sharply with temperature than in the temperate peat samples. For same temperature, optimum soil moisture levels for CO2 production were higher in the peat samples from more flooded sites. However, standard reaction kinetics (e.g., Q 10 temperature coefficient and Arrhenius equation) failed to account for the apparent lack of temperature dependence of CO2 production rates measured below 0 °C, and a sudden increase after a freezing event. Thus, we caution against using the simple kinetic expressions to represent the CO2 emissions from northern peatlands, especially regarding the long NGS period with multiple soil freeze and thaw events.Eunji ByunFereidoun RezanezhadLinden FairbairnStephanie SlowinskiNathan BasilikoJonathan S. PriceWilliam L. QuintonPascale Roy-LéveilléeKara WebsterPhilippe Van CappellenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-15 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Eunji Byun Fereidoun Rezanezhad Linden Fairbairn Stephanie Slowinski Nathan Basiliko Jonathan S. Price William L. Quinton Pascale Roy-Léveillée Kara Webster Philippe Van Cappellen Temperature, moisture and freeze–thaw controls on CO2 production in soil incubations from northern peatlands
description	Abstract Peat accumulation in high latitude wetlands represents a natural long-term carbon sink, resulting from the cumulative excess of growing season net ecosystem production over non-growing season (NGS) net mineralization in soils. With high latitudes experiencing warming at a faster pace than the global average, especially during the NGS, a major concern is that enhanced mineralization of soil organic carbon will steadily increase CO2 emissions from northern peatlands. In this study, we conducted laboratory incubations with soils from boreal and temperate peatlands across Canada. Peat soils were pretreated for different soil moisture levels, and CO2 production rates were measured at 12 sequential temperatures, covering a range from − 10 to + 35 °C including one freeze–thaw event. On average, the CO2 production rates in the boreal peat samples increased more sharply with temperature than in the temperate peat samples. For same temperature, optimum soil moisture levels for CO2 production were higher in the peat samples from more flooded sites. However, standard reaction kinetics (e.g., Q 10 temperature coefficient and Arrhenius equation) failed to account for the apparent lack of temperature dependence of CO2 production rates measured below 0 °C, and a sudden increase after a freezing event. Thus, we caution against using the simple kinetic expressions to represent the CO2 emissions from northern peatlands, especially regarding the long NGS period with multiple soil freeze and thaw events.
format	article
author	Eunji Byun Fereidoun Rezanezhad Linden Fairbairn Stephanie Slowinski Nathan Basiliko Jonathan S. Price William L. Quinton Pascale Roy-Léveillée Kara Webster Philippe Van Cappellen
author_facet	Eunji Byun Fereidoun Rezanezhad Linden Fairbairn Stephanie Slowinski Nathan Basiliko Jonathan S. Price William L. Quinton Pascale Roy-Léveillée Kara Webster Philippe Van Cappellen
author_sort	Eunji Byun
title	Temperature, moisture and freeze–thaw controls on CO2 production in soil incubations from northern peatlands
title_short	Temperature, moisture and freeze–thaw controls on CO2 production in soil incubations from northern peatlands
title_full	Temperature, moisture and freeze–thaw controls on CO2 production in soil incubations from northern peatlands
title_fullStr	Temperature, moisture and freeze–thaw controls on CO2 production in soil incubations from northern peatlands
title_full_unstemmed	Temperature, moisture and freeze–thaw controls on CO2 production in soil incubations from northern peatlands
title_sort	temperature, moisture and freeze–thaw controls on co2 production in soil incubations from northern peatlands
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e3b50d438dce4e8b911779748232308e
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Temperature, moisture and freeze–thaw controls on CO2 production in soil incubations from northern peatlands

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