Aquatic export of young dissolved and gaseous carbon from a pristine boreal fen Implications for peat carbon stock stability

Aquatic export of young dissolved and gaseous carbon from a pristine boreal fen : Implications for peat carbon stock stability

© 2017 The Authors Global Change Biology Published by John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 23(2017), 12 vom: 15. Dez., Seite 5523-5536
1. Verfasser: Campeau, Audrey (VerfasserIn)
Weitere Verfasser: Bishop, Kevin H, Billett, Michael F, Garnett, Mark H, Laudon, Hjalmar, Leach, Jason A, Nilsson, Mats B, Öquist, Mats G, Wallin, Marcus B
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Research Support, Non-U.S. Gov't aquatic C export carbon dioxide dissolved organic carbon methane northern peatlands radiocarbon dating Gases Soil mehr... Carbon Dioxide 142M471B3J Carbon 7440-44-0 Methane OP0UW79H66
Beschreibung
Zusammenfassung:© 2017 The Authors Global Change Biology Published by John Wiley & Sons Ltd.
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 (14 C) of dissolved organic carbon (DOC), carbon dioxide (CO2 ), and methane (CH4 ) exported from a boreal peatland catchment coupled with 14 C 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 14 C 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
Beschreibung:Date Completed 19.09.2018
Date Revised 18.10.2018
published: Print-Electronic
Citation Status MEDLINE
ISSN:1365-2486
DOI:10.1111/gcb.13815