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Multiple sources and sinks of dissolved inorganic carbon across Swedish streams, refocusing the lens of stable C isotopes
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap. (Climate Impacts Research Centre ; Arcum)
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2017 (engelsk)Inngår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, artikkel-id 9158Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

It is well established that stream dissolved inorganic carbon (DIC) fluxes play a central role in the global C cycle, yet the sources of stream DIC remain to a large extent unresolved. Here, we explore large-scale patterns in δ13C-DIC from streams across Sweden to separate and further quantify the sources and sinks of stream DIC. We found that stream DIC is governed by a variety of sources and sinks including biogenic and geogenic sources, CO2 evasion, as well as in-stream processes. Although soil respiration was the main source of DIC across all streams, a geogenic DIC influence was identified in the northernmost region. All streams were affected by various degrees of atmospheric CO2 evasion, but residual variance in δ13C-DIC also indicated a significant influence of in-stream metabolism and anaerobic processes. Due to those multiple sources and sinks, we emphasize that simply quantifying aquatic DIC fluxes will not be sufficient to characterise their role in the global C cycle.

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Nature Publishing Group, 2017. Vol. 7, artikkel-id 9158
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URN: urn:nbn:se:umu:diva-139143DOI: 10.1038/s41598-017-09049-9ISI: 000408285200002OAI: oai:DiVA.org:umu-139143DiVA, id: diva2:1146632
Tilgjengelig fra: 2017-10-03 Laget: 2017-10-03 Sist oppdatert: 2018-06-09bibliografisk kontrollert

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