Methane formation and consumption by sediments in a cross-channel profile of a small river impoundment

Methane dynamics in aquatic sediments

  • Adam Bednařík | adambednarik01@gmail.com Department of Ecology and Environmental Sciences, Laboratory of Aquatic Microbial Ecology, Palacky University of Olomouc, Czech Republic.
  • Martin Blaser Department of Biogeochemistry, Max Planck Institute for Terrestrial Microbiology, Marburg,, Germany.
  • Martin Rulik Department of Ecology and Environmental Sciences, Laboratory of Aquatic Microbial Ecology, Palacky University of Olomouc, Czech Republic.

Abstract

Rivers are a natural source of methane (CH4) into the atmosphere and may contribute significantly to total CH4 emissions. Even though the details of sources of CH4 in rivers are not fully understood, weirs have been recognized as a hotspot of CH4 emissions. In this study, we investigated CH4 production and consumption in air-exposed river sediments along a cross-channel transect located upstream of a weir. Stable carbon isotopes were used for determination of individual methanogenic pathways. In order to understand the relationship between physicochemical and biological processes, additional parameters such as organic matter, grain median size, and carbon and nitrogen content were characterized as well. Generally, samples from the surface sediment layer (0-10 cm) had higher CH4 production than sediments from the deeper layer (10-20 cm) during the incubation experiments. Sediments near the bank zones and in the mid-channel were characterized by the highest organic carbon content (6.9 %) as well the highest methanogenic activity (2.5 mmol g-1 DW d-1). The CH4 production was predominated by H2/CO2 dependent methanogenesis in the surface sediment layer (0-10 cm), while the proportion of acetoclastic and hydrogenotrophic methanogenesis in the deeper sediment layer (10-20 cm) was balanced. The CH4 oxidation potential of sediments showed the same spatial pattern as observed for the CH4 production. Our results showed high spatial variability of sediment CH4 production and oxidation in the cross-channel profile upstream of the weir, whereas the highest CH4 dynamics were observed in the littoral zones. This variability was closely linked with the carbon and nitrogen content in the sediment samples.

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Published
2019-06-06
Section
Original Articles
Associate Editor
Franco Tassi, University of Florence, Italy
Supporting Agencies
This study was financially supported by Palacký University grant IGA_PrF_2017_015
Keywords:
Methane, river impoundment, methane production, river sediment, methanogenic pathways
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How to Cite
1.
Bednařík A, Blaser M, Rulik M. Methane formation and consumption by sediments in a cross-channel profile of a small river impoundment. jlimnol [Internet]. 6Jun.2019 [cited 6Dec.2019];78(2). Available from: https://www.jlimnol.it/index.php/jlimnol/article/view/jlimnol.2019.1898