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Constrained microbial processing of allochthonous organic carbon in boreal lake sediments
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
The Department of Thematic Studies - Water and Environmental Studies Linköping university.
Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, and Leibniz Centre for Agricultural Landscape Research (ZALF), Müncheberg, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
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2012 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 57, no 1, 163-175 p.Article in journal (Refereed) Published
Abstract [en]

We investigated sediment bacterial metabolism in eight lakes with different inputs of allochthonous and autochthonous organic carbon in south-central Sweden. Sediment bacterial production, mineralization and biomass were measured on a seasonal basis and along a lake depth gradient together with different water and sediment characteristics. Sediment bacterial metabolism was primarily controlled by temperature but also regulated by organic carbon quality/origin. Metabolism was positively correlated to measures of autochthonous influence on the sediment organic carbon, but did not show a similar increase with increasing input of allochthonous organic carbon.  Hence, in contrast to what is currently known for the water column, increasing amounts of terrestrial organic carbon do not result in enhanced sediment bacterial metabolism.  Meio- and macrobenthic invertebrate biomass were at most weakly correlated to bacterial metabolism and biomass, suggesting limited control of sediment bacteria by grazing. We suggest that the bacterial metabolism in boreal lake sediments is constrained by low temperatures and by the recalcitrant nature of the dominant organic carbon, resulting in sediments being an effective sink of organic carbon.

Place, publisher, year, edition, pages
2012. Vol. 57, no 1, 163-175 p.
Keyword [en]
allochthonous organic carbon, microbial metabolism, lake sediments
National Category
Ecology
Research subject
Limnology
Identifiers
URN: urn:nbn:se:uu:diva-150712DOI: 10.4319/lo.2012.57.1.0163ISI: 000298321300014OAI: oai:DiVA.org:uu-150712DiVA: diva2:408444
Available from: 2011-04-04 Created: 2011-04-04 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Boreal Lake Sediments as Sources and Sinks of Carbon
Open this publication in new window or tab >>Boreal Lake Sediments as Sources and Sinks of Carbon
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Inland waters process large amounts of organic carbon, contributing to CO2 and CH4 emissions, as well as storing organic carbon (OC) over geological timescales. Recently, it has been shown that the magnitude of these processes is of global significance. It is therefore important to understand what regulates OC cycling in inland waters and how is that affected by climate change. This thesis investigates the constraints on microbial processing of sediment OC, as a key factor of the carbon cycling in boreal lakes.

Sediment bacterial metabolism was primarily controlled by temperature but also regulated by OC quality/origin. Temperature sensitivity of sediment OC mineralization was similar in contrasting lakes and over long-term. Allochthonous OC had a strong constraining effect on sediment bacterial metabolism and biomass, with increasingly allochthonous sediments supporting decreasing bacterial metabolism and biomass. The bacterial biomass followed the same pattern as bacterial activity and was largely regulated by similar factors. The rapid turnover of bacterial biomass as well as the positive correlation between sediment mineralization and bacterial biomass suggest a limited effect of bacterial grazing. Regardless of the OC source, the sediment microbial community was more similar within season than within lakes.

A comparison of data from numerous soils as well as sediments on the temperature response of OC mineralization showed higher temperature sensitivity of the sediment mineralization. Furthermore, the low rates of areal OC mineralization in sediments compared to soils suggest that lakes sediments are hotspots of OC sequestration.

Increased sediment mineralization due to increase in temperature in epilimnetic sediments can significantly reduce OC burial in boreal lakes. An increase of temperature, as predicted for Northern latitudes, under different climate warming scenarios by the end of the twenty-first century, resulted in 4–27% decrease in lake sediment OC burial for the entire boreal zone.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2011. 39 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 823
Keyword
boreal lakes, allochthonous, lake sediments, sediment mineralization, bacterial production, bacterial biomass, carbon cycle
National Category
Ecology
Research subject
Limnology
Identifiers
urn:nbn:se:uu:diva-150709 (URN)978-91-554-8072-1 (ISBN)
Public defence
2011-05-31, Friessalen, Evolutionary Biology Centre (EBC), Norbyvägen 18, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2011-05-10 Created: 2011-04-04 Last updated: 2011-07-01Bibliographically approved

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Gudasz, CristianSteger, KristinTranvik, Lars J.

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