In:
Global Change Biology, Wiley, Vol. 23, No. 12 ( 2017-12), p. 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 ( 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.
Type of Medium:
Online Resource
ISSN:
1354-1013
,
1365-2486
DOI:
10.1111/gcb.2017.23.issue-12
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
2020313-5
SSG:
12
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