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Temperature Dependence of Apparent Respiratory Quotients and Oxygen Penetration Depth in Contrasting Lake Sediments
Uppsala University, Sweden.
Uppsala University, Sweden; Umeå University, Sweden.
Uppsala University, Sweden.
Uppsala University, Sweden.
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2017 (English)In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 122, no 11, p. 3076-3087Article in journal (Refereed) Published
Abstract [en]

Lake sediments constitute an important compartment in the carbon cycle of lakes, by burying carbon over geological timescales and by production and emission of greenhouse gases. The degradation of organic carbon (OC) in lake sediments is linked to both temperature and oxygen (O-2), but the interactive nature of this regulation has not been studied in lake sediments in a quantitative way. We present the first systematic investigation of the effects of temperature on the apparent respiratory quotient (RQ, i.e., the molar ratio between carbon dioxide (CO2) production and O-2 consumption) in two contrasting lake sediments. Laboratory incubations of sediment cores of a humic lake and an eutrophic lake across a 1-21 degrees C temperature gradient over 157days revealed that both CO2 production and O-2 consumption were positively, exponentially, and similarly dependent on temperature. The apparent RQ differed significantly between the lake sediments (0.630.26 and 0.990.28 in the humic and the eutrophic lake, respectively; meanSD) and was significantly and positively related to temperature. The O-2 penetration depth into the sediment varied by a factor of 2 over the 1-21 degrees C temperature range and was significantly, negatively, and similarly related to temperature in both lake sediments. Accordingly, increasing temperature may influence the overall extent of OC degradation in lake sediments by limiting O-2 supply to aerobic microbial respiration to the topmost sediment layer, resulting in a concomitant shift to less effective anaerobic degradation pathways. This suggests that temperature may represent a key controlling factor of the OC burial efficiency in lake sediments.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2017. Vol. 122, no 11, p. 3076-3087
Keywords [en]
limnology; sediment; aquatic biogeochemistry; respiration
National Category
Geosciences, Multidisciplinary
Identifiers
URN: urn:nbn:se:liu:diva-143999DOI: 10.1002/2017JG003833ISI: 000418086800024OAI: oai:DiVA.org:liu-143999DiVA, id: diva2:1170209
Note

Funding Agencies|Swedish Research Council for Environment (Formas); Swedish Research Council (VR); Spanish Ministry of Science and Innovation [BES2008-008160]; European Research Council under European Union/ERC [336642]

Available from: 2018-01-02 Created: 2018-01-02 Last updated: 2018-01-02

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Tema Environmental ChangeFaculty of Arts and Sciences
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  • apa
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