Articles | Volume 15, issue 2
https://doi.org/10.5194/bg-15-457-2018
https://doi.org/10.5194/bg-15-457-2018
Research article
 | 
24 Jan 2018
Research article |  | 24 Jan 2018

Quality transformation of dissolved organic carbon during water transit through lakes: contrasting controls by photochemical and biological processes

Martin Berggren, Marcus Klaus, Balathandayuthabani Panneer Selvam, Lena Ström, Hjalmar Laudon, Mats Jansson, and Jan Karlsson

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Cited articles

Amon, R. M. W. and Benner, R.: Photochemical and microbial consumption of dissolved organic carbon and dissolved oxygen in the Amazon River system, Geochim. Cosmochim. Ac., 60, 1783–1792, 1996.
Anesio, A. M. and Granéli, W.: Increased photoreactivity of DOC by acidification: Implications for the carbon cycle in humic lakes, Limnol. Oceanogr., 48, 735–744, 2003.
Asmala, E., Autio, R., Kaartokallio, H., Stedmon, C. A., and Thomas, D. N.: Processing of humic-rich riverine dissolved organic matter by estuarine bacteria: effects of predegradation and inorganic nutrients, Aquat. Sci., 76, 451–463, https://doi.org/10.1007/s00027-014-0346-7, 2014.
Ågren, A., Berggren, M., Laudon, H., and Jansson, M.: Terrestrial export of highly bioavailable carbon from small boreal catchments in spring floods, Freshwater Biol., 53, 964–972, https://doi.org/10.1111/j.1365-2427.2008.01955.x, 2008a.
Ågren, A., Buffam, I., Berggren, M., Bishop, K., Jansson, M., and Laudon, H.: Dissolved organic carbon characteristics in boreal streams in a forest-wetland gradient during the transition between winter and summer, J. Geophys. Res.-Bio., 113, G03031, https://doi.org/10.1029/2007JG000674, 2008b.
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Short summary
The quality of dissolved organic carbon (DOC), especially its color, is a defining feature of freshwater ecosystems. We found that colored DOC fractions are surprisingly resistant to natural degradation during water transit through many brown-water lakes. This is explained by the dominance of microbial processes that appear to selectively remove noncolored DOC. However, in lakes where sunlight degradation plays a relatively larger role, significant DOC bleaching occurs.
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