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.
Veröffentlicht in: | Global change biology. - 1999. - 23(2017), 12 vom: 15. Dez., Seite 5523-5536 |
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1. Verfasser: | |
Weitere Verfasser: | , , , , , , , |
Format: | Online-Aufsatz |
Sprache: | English |
Veröffentlicht: |
2017
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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... |
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 |
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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 |