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Measurement of methane oxidation in lakes: A comparison of methods
Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.ORCID-id: 0000-0003-0038-2152
Linköpings universitet, Institutionen för tema, Tema vatten i natur och samhälle. Linköpings universitet, Filosofiska fakulteten.
Department of Limnology, Uppsala University, Uppsala, Sweden.
2002 (Engelska)Ingår i: Environmental Science & Technology, ISSN 0013-936X, Vol. 36, nr 15, s. 3354-3361Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Methane oxidation in lakes constrains the methane emissions to the atmosphere and simultaneously enables the transfer of methane carbon to pelagic food webs, Several different methods have been used to estimate methane oxidation, but these methods have not previously been compared. In this study, we present methane oxidation estimates from three different lakes during summer and winter, using methods based on the transformation of added (CH4)-C-14, the fractionation of natural methane C-13, and the mass balance modeling of concentration gradients, All methods yielded similar results, including similar differences between lakes and seasons. Average methane oxidation rates varied from 0.25 to 81 mg of C m(-2) d(-1) and indicate that the three methods are comparable, although they to some extent take different processes into account. Critical issues as well as drawbacks and advantages with the used methods are thoroughly discussed. We conclude that methods using the stable isotope or mass balance modeling approach represent promising alternatives, particularly for studies focusing on ecosystem-scale carbon metabolism.

Ort, förlag, år, upplaga, sidor
American Chemical Society (ACS), 2002. Vol. 36, nr 15, s. 3354-3361
Nationell ämneskategori
Naturgeografi
Identifikatorer
URN: urn:nbn:se:liu:diva-28226DOI: 10.1021/es010311pISI: 000177242600043Scopus ID: 2-s2.0-0036667658OAI: oai:DiVA.org:liu-28226DiVA, id: diva2:248978
Tillgänglig från: 2009-10-09 Skapad: 2009-10-09 Senast uppdaterad: 2018-10-05Bibliografiskt granskad
Ingår i avhandling
1. Anoxic degradation of organic matter in lakes: implications for carbon cycling and aquatic food webs
Öppna denna publikation i ny flik eller fönster >>Anoxic degradation of organic matter in lakes: implications for carbon cycling and aquatic food webs
2002 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Considerable evidence from laboratory studies and marine environments suggests that degradation of organic matter (OM) is restricted under anoxic conditions compared to when molecular oxygen (O2) is present. However, other studies contradict this view since they found similar OM degradation rates and bacterial growth rates under both oxic and anoxic conditions in aquatic environments. Studies from freshwater environments are rare, and have been primarily based on bacterial production estimates. Anoxic degradation of OM in lakes is commonly considered to be slow and of little importance for overall lake food webs compared to oxic degradation. The present thesis and the work it is based on challenge this view. First, the performance of a commonly used method to measure bacterial production was tested in both oxic and anoxic lake water. Then, the oxic and anoxic potentials of bacterial growth and OM mineralization were compared in lake water and sediment. In addition, I assessed the potential of carbon transfer from methane (CH4; i.e. an end-product of anoxic degradation) to pelagic food webs. Three methods for measuring water column methane oxidation were evaluated. Then, the potential transport of methane carbon into the microbial community via methane oxidation, and further -up the food web- into the zooplankton community was estimated. Results indicate 1) that OM degradation and bacterial growth may be similar in oxic and anoxic lake environments, 2) that OM characteristics may be more important for the mineralization than the O2 regime per se in the short term (daysweeks), and 3) that methane can be a significant source of carbon and energy for pelagic food webs. This suggests that the anoxic carbon metabolism may be extensive and potentially important for pelagic organisms in many lakes.

Ort, förlag, år, upplaga, sidor
Linköping: Linköpings universitet, 2002. s. 55
Serie
Linköping Studies in Arts and Science, ISSN 0282-9800 ; 262
Nyckelord
Ekonsystem i vatten
Nationell ämneskategori
Tvärvetenskapliga studier inom samhällsvetenskap
Identifikatorer
urn:nbn:se:liu:diva-29575 (URN)14951 (Lokalt ID)91-7373-436-5 (ISBN)14951 (Arkivnummer)14951 (OAI)
Disputation
2002-11-01, Sal Elysion, Hus-T, Universitetsområdet Valla, Linköping, 10:00 (Svenska)
Opponent
Tillgänglig från: 2009-10-09 Skapad: 2009-10-09 Senast uppdaterad: 2018-10-05Bibliografiskt granskad

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Bastviken, DavidEjlertsson, Jörgen

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