Articles | Volume 19, issue 15
https://doi.org/10.5194/bg-19-3625-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-19-3625-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
05 Aug 2022
Research article |
| 05 Aug 2022
| 05 Aug 2022
Effects of brackish water inflow on methane-cycling microbial communities in a freshwater rewetted coastal fen
Cordula Nina Gutekunst
CORRESPONDING AUTHOR
Landscape Ecology, University of Rostock, Rostock, 18059, Germany
Susanne Liebner
Geomicrobiology Section, German Research Centre for Geosciences (GFZ),
Potsdam, 14473, Germany
Institute of Biochemistry and Biology, University of Potsdam, Potsdam,
14476, Germany
Anna-Kathrina Jenner
Geochemistry and Stable Isotope Biogeochemistry, Leibniz Institute for
Baltic Sea Research (IOW), Warnemünde, 18119, Germany
Klaus-Holger Knorr
Institute of Landscape Ecology, Ecohydrology and Biogeochemistry
Group, University of Münster, Münster, 48149, Germany
Viktoria Unger
Institute of Plant Science and Microbiology, Applied Plant Ecology,
University of Hamburg, Hamburg, 22609, Germany
Franziska Koebsch
Bioclimatology, University of Göttingen, Göttingen, 37073,
Germany
Erwin Don Racasa
Soil Physics, University of Rostock, Rostock, 18059, Germany
Sizhong Yang
Geomicrobiology Section, German Research Centre for Geosciences (GFZ),
Potsdam, 14473, Germany
Michael Ernst Böttcher
Geochemistry and Stable Isotope Biogeochemistry, Leibniz Institute for
Baltic Sea Research (IOW), Warnemünde, 18119, Germany
Marine Geochemistry, University of Greifswald, Greifswald, 17489,
Germany
Department of Maritime Systems, University of Rostock, Rostock,
18059, Germany
Manon Janssen
Soil Physics, University of Rostock, Rostock, 18059, Germany
Jens Kallmeyer
Geomicrobiology Section, German Research Centre for Geosciences (GFZ),
Potsdam, 14473, Germany
Denise Otto
Geochemistry and Stable Isotope Biogeochemistry, Leibniz Institute for
Baltic Sea Research (IOW), Warnemünde, 18119, Germany
Iris Schmiedinger
Geochemistry and Stable Isotope Biogeochemistry, Leibniz Institute for
Baltic Sea Research (IOW), Warnemünde, 18119, Germany
Lucas Winski
Geochemistry and Stable Isotope Biogeochemistry, Leibniz Institute for
Baltic Sea Research (IOW), Warnemünde, 18119, Germany
present address: Institute for Technical Chemistry and Environmental Chemistry, University of Jena, Jena, 07743, Germany
Gerald Jurasinski
Landscape Ecology, University of Rostock, Rostock, 18059, Germany
Department of Maritime Systems, University of Rostock, Rostock,
18059, Germany
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Ines Spangenberg, Pier Paul Overduin, Ellen Damm, Ingeborg Bussmann, Hanno Meyer, Susanne Liebner, Michael Angelopoulos, Boris K. Biskaborn, Mikhail N. Grigoriev, and Guido Grosse
The Cryosphere, 15, 1607–1625, https://doi.org/10.5194/tc-15-1607-2021, https://doi.org/10.5194/tc-15-1607-2021, 2021
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Thermokarst lakes are common on ice-rich permafrost. Many studies have shown that they are sources of methane to the atmosphere. Although they are usually covered by ice, little is known about what happens to methane in winter. We studied how much methane is contained in the ice of a thermokarst lake, a thermokarst lagoon and offshore. Methane concentrations differed strongly, depending on water body type. Microbes can also oxidize methane in ice and lower the concentrations during winter.
Florian Beyer, Florian Jansen, Gerald Jurasinski, Marian Koch, Birgit Schröder, and Franziska Koebsch
Biogeosciences, 18, 917–935, https://doi.org/10.5194/bg-18-917-2021, https://doi.org/10.5194/bg-18-917-2021, 2021
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Increasing drought frequency can jeopardize the restoration of the CO2 sink function in degraded peatlands. We explored the effect of the summer drought in 2018 on vegetation development and CO2 exchange in a rewetted fen. Drought triggered a rapid spread of new vegetation whose CO2 assimilation could partially outweigh the drought-related rise in respiratory CO2 loss. Our study shows important regulatory mechanisms of a rewetted fen to maintain its net CO2 sink function even in a very dry year.
Leandra Stephanie Emilia Praetzel, Nora Plenter, Sabrina Schilling, Marcel Schmiedeskamp, Gabriele Broll, and Klaus-Holger Knorr
Biogeosciences, 17, 5057–5078, https://doi.org/10.5194/bg-17-5057-2020, https://doi.org/10.5194/bg-17-5057-2020, 2020
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Small lakes are important but variable sources of greenhouse gas emissions. We performed lab experiments to determine spatial patterns and drivers of CO2 and CH4 emission and sediment gas production within a lake. The observed high spatial variability of emissions and production could be explained by the degradability of the sediment organic matter. We did not see correlations between production and emissions and suggest on-site flux measurements as the most accurate way for determing emissions.
Wolfgang Knierzinger, Ruth Drescher-Schneider, Klaus-Holger Knorr, Simon Drollinger, Andreas Limbeck, Lukas Brunnbauer, Felix Horak, Daniela Festi, and Michael Wagreich
E&G Quaternary Sci. J., 69, 121–137, https://doi.org/10.5194/egqsj-69-121-2020, https://doi.org/10.5194/egqsj-69-121-2020, 2020
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We present multi-proxy analyses of a 14C-dated peat core covering the past ⁓5000 years from the ombrotrophic Pürgschachen Moor. Pronounced increases in cultural indicators suggest significant human activity in the Bronze Age and in the period of the late La Tène culture. We found strong, climate-controlled interrelations between the pollen record, the humification degree and the ash content. Human activity is reflected in the pollen record and by heavy metals.
Fabian Schwichtenberg, Johannes Pätsch, Michael Ernst Böttcher, Helmuth Thomas, Vera Winde, and Kay-Christian Emeis
Biogeosciences, 17, 4223–4245, https://doi.org/10.5194/bg-17-4223-2020, https://doi.org/10.5194/bg-17-4223-2020, 2020
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Ocean acidification has a range of potentially harmful consequences for marine organisms. It is related to total alkalinity (TA) mainly produced in oxygen-poor situations like sediments in tidal flats. TA reduces the sensitivity of a water body to acidification. The decomposition of organic material and subsequent TA release in the tidal areas of the North Sea (Wadden Sea) is responsible for reduced acidification in the southern North Sea. This is shown with the results of an ecosystem model.
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Short summary
Methane emissions decreased after a seawater inflow and a preceding drought in freshwater rewetted coastal peatland. However, our microbial and greenhouse gas measurements did not indicate that methane consumers increased. Rather, methane producers co-existed in high numbers with their usual competitors, the sulfate-cycling bacteria. We studied the peat soil and aimed to cover the soil–atmosphere continuum to better understand the sources of methane production and consumption.
Methane emissions decreased after a seawater inflow and a preceding drought in freshwater...
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