Bishop, Kevin
- Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
Forskningsartikel2017Vetenskapligt granskadÖppen tillgång
Campeau, Audrey; Bishop, Kevin; Billett, Michael F.; Garnett, Mark H.; Laudon, Hjalmar; Leach, Jason; Nilsson, Mats; Öquist, Mats; Wallin, Marcus
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 (C-14) of dissolved organic carbon (DOC), carbon dioxide (CO2), and methane (CH4) exported from a boreal peatland catchment coupled with C-14 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 C-14 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.
aquatic C export; carbon dioxide; dissolved organic carbon; methane; northern peatlands; radiocarbon dating
Global Change Biology
2017, Volym: 23, nummer: 12, sidor: 5523-5536
Utgivare: WILEY
SDG14 Bevara och nyttja haven och de marina resurserna på ett hållbart sätt för en hållbar utveckling
SDG13 Vidta omedelbara åtgärder för att bekämpa klimatförändringarna och dess konsekvenser
Miljövetenskap
DOI: https://doi.org/10.1111/gcb.13815
https://res.slu.se/id/publ/93158