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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 H.,
Billett Michael F.,
Garnett Mark H.,
Laudon Hjalmar,
Leach Jason A.,
Nilsson Mats B.,
Öquist Mats G.,
Wallin Marcus B.
Publication year - 2017
Publication title -
global change biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.146
H-Index - 255
eISSN - 1365-2486
pISSN - 1354-1013
DOI - 10.1111/gcb.13815
Subject(s) - peat , boreal , environmental science , mire , dissolved organic carbon , carbon cycle , ecosystem , aquatic ecosystem , carbon dioxide , carbon fibers , surface runoff , hydrology (agriculture) , environmental chemistry , ecology , geology , chemistry , biology , materials science , geotechnical engineering , composite number , composite material
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 ( CO 2 ), and methane ( CH 4 ) 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 , CO 2 , and CH 4 primarily being sourced from deep peat horizons (2–4 m) near the mire's outlet. In fact, the 14 C content of DOC , CO 2 , and CH 4 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.