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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Aquatic export of young dissolved and gaseous carbon from a pristine boreal fen: Implications for peat carbon stock stability
Author(s): Campeau, Audrey
Bishop, Kevin
Billett, Michael
Garnett, Mark H
Laudon, Hjalmar
Leach, Jason A
Nilsson, Mats B
Oquist, Mats G
Wallin, Marcus B
Keywords: aquatic C export
carbon dioxide
dissolved organic carbon
northern peatlands
radiocarbon dating
Issue Date: Dec-2017
Citation: Campeau A, Bishop K, Billett M, Garnett MH, Laudon H, Leach JA, Nilsson MB, Oquist MG & Wallin MB (2017) Aquatic export of young dissolved and gaseous carbon from a pristine boreal fen: Implications for peat carbon stock stability, Global Change Biology, 23 (12), pp. 5523-5536.
Abstract: The stability of northern peatland's carbon (C) store under changing climate is of major concern for the global C cycle. The aquatic export of C from boreal peatlands is recognized as both a critical pathway for the remobilization of peat C stocks as well as a major component of the net ecosystem C balance (NECB). Here, we present a full year characterization of radiocarbon content ( 14C) of dissolved organic carbon (DOC), carbon dioxide (CO2), and methane (CH4) exported from a boreal peatland catchment coupled with 14C characterization of the catchment's peat profile of the same C species. The age of aquatic C in runoff varied little throughout the year and appeared to be sustained by recently fixed C from the atmosphere (<60 years), despite stream DOC, CO2, and CH4 primarily being sourced from deep peat horizons (2–4 m) near the mire's outlet. In fact, the 14C content of DOC, CO2, and CH4 across the entire peat profile was considerably enriched with postbomb C compared with the solid peat material. Overall, our results demonstrate little to no mobilization of ancient C stocks from this boreal peatland and a relatively large resilience of the source of aquatic C export to forecasted hydroclimatic changes.
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Rights: © 2017 The Authors Global Change Biology Published by John Wiley & Sons Ltd This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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