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Organic Carbon Processing During Transport Through Boreal Inland Waters: Particles as Important Sites
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. WasserCluster Lunz, Lunz Am See, Austria.ORCID iD: 0000-0002-6503-9497
Catalan Inst Water Res ICRA, Girona, Spain.ORCID iD: 0000-0002-2433-4190
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0001-9842-0158
Catalan Inst Water Res ICRA, Girona, Spain.
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2018 (English)In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 123, no 8, p. 2412-2428Article in journal (Refereed) Published
Abstract [en]

The degradation and transformation of organic carbon (C) in inland waters result in significant CO2 emissions from inland waters. Even though most of the C in inland waters occurs as dissolved organic carbon (DOC), studies on particulate organic carbon (POC) and how it influences the overall reactivity of organic C in transport are still scarce. We sampled 30 aquatic ecosystems following an aquatic continuum including peat surface waters, streams, rivers, and lakes. We report DOC and POC degradation rates, relate degradation patterns to environmental data across these systems, and present qualitative changes in dissolved organic matter and particulate organic matter during degradation. Microbial degradation rates of POC were approximately 15 times higher compared to degradation of DOC, with POC half-lives of only 17 +/- 3 (mean +/- SE) days across all sampled aquatic ecosystems. Rapid POC decay was accompanied by a shift in particulate C: N ratios, whereas dissolved organic matter composition did not change at the time scale of incubations. The faster degradation of the POC implies a constant replenishment to sustain natural POC concentrations. We suggest that degradation of organic matter transported through the inland water continuum might occur to a large extent via transition of DOC into more rapidly cycling POC in nature, for example, triggered by light. In this way, particles would be a dominant pool of organic C processing across the boreal aquatic continuum, partially sustained by replenishment via flocculation of DOC.

Place, publisher, year, edition, pages
2018. Vol. 123, no 8, p. 2412-2428
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-363637DOI: 10.1029/2018JG004500ISI: 000445731100009OAI: oai:DiVA.org:uu-363637DiVA, id: diva2:1257095
Funder
Knut and Alice Wallenberg Foundation, KAW 2013.0091Swedish Research Council, 2014-04264Swedish Research Council, 2015-4870German Research Foundation (DFG), AT 185/1-1Available from: 2018-10-18 Created: 2018-10-18 Last updated: 2019-06-10Bibliographically approved

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Attermeyer, KatrinEinarsdóttir, KarólinaGroeneveld, Marloes M.Hawkes, Jeffrey A.Bergquist, JonasTranvik, Lars

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