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Linking allochthonous dissolved organic matter and boreal lake sediment carbon sequestration: The role of light-mediated flocculation
Stockholm University, Faculty of Science, Department of Geology and Geochemistry.
2008 (English)In: Limnology and Oceanography, ISSN 0024-3590, Vol. 53, no 6, 2416-2426 p.Article in journal (Refereed) Published
Abstract [en]

We measured flocculation of dissolved organic carbon (DOC) in the water from a humic lake (DOC = 14.9 mg C L-1) and from an adjacent mire (DOC = 25.7 mg C L-1), in in situ enclosure experiments with different light regimes. Light stimulated the formation of organic particles in both waters, and organic particle formation was observed at all incubation depths, even in the dark controls. Production of phytoplankton biomass was negligible, and allochthonous DOC was the most important precursor of the sinking particles. 8-22% and 25-60% of the loss of DOC in lake and mire water, respectively, could be accounted for by flocculation. Depth-integrated flocculation based on the enclosure experiments was 14.7 mg C m(-2) d(-1). Lake-water DOC concentration and water color has been increasing during the last decade, and sediment trap studies show that gross sedimentation of organic carbon also increased. Thus flocculation of allochthonous DOC, stimulated by light, constitutes a pathway for the sequestration of carbon in lake sediments.

Place, publisher, year, edition, pages
2008. Vol. 53, no 6, 2416-2426 p.
Keyword [en]
humic substances, photochemical transformation, bacterial-growth, solar-radiation, climate, waters, photoreactions, phytoplankton, degradation, budgets
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-57709DOI: 10.4319/lo.2008.53.6.2416ISI: 000261355500006OAI: diva2:417641
authorCount :4Available from: 2011-05-17 Created: 2011-05-16 Last updated: 2011-05-17Bibliographically approved

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