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  Effects of a brackish water inflow on peat pore water variables and methane-cycling microbial community abundances in a freshwater rewetted coastal fen.

Gutekunst, C. N., Liebner, S., Jenner, A.-K., Knorr, K.-H., Unger, V., Koebsch, F., Racasa, E. D., Yang, S., Böttcher, M. E., Janssen, M., Kallmeyer, J., Otto, D., Schmiedinger, I., Winski, L., Jurasinski, G. (2022): Effects of a brackish water inflow on peat pore water variables and methane-cycling microbial community abundances in a freshwater rewetted coastal fen.
https://doi.org/10.1594/PANGAEA.949824

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 Urheber:
Gutekunst, Cordula Nina1, Autor
Liebner, Susanne2, Autor              
Jenner, Anna-Kathrina1, Autor
Knorr, Klaus-Holger1, Autor
Unger, Viktoria1, Autor
Koebsch, Franziska1, Autor
Racasa, Erwin Don1, Autor
Yang, Sizhong2, Autor              
Böttcher, Michael Ernst1, Autor
Janssen, Manon1, Autor
Kallmeyer, J.2, Autor              
Otto, Denise1, Autor
Schmiedinger, Iris1, Autor
Winski, Lucas1, Autor
Jurasinski, Gerald1, Autor
Affiliations:
1External Organizations, ou_persistent22              
23.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146043              

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Schlagwörter: Coastal peatland rewetting; methanogens; methanotrophs; pore water geochemistry; sulfate-reducing bacteria
 Zusammenfassung: The rewetting of peatlands is a promising measure to mitigate greenhouse gas (GHG) emissions by preventing the further mineralization of the peat soil through aeration. In coastal peatland, the rewetting with brackish water can increase the GHG mitigation potential by the introduction of sulfate, a terminal electron acceptor (TEA). Sulfate is known to lower the CH4 production and thus, its emission by favoring the growth of sulfate-reducers, which outcompete methanogens for substrate. The data contain porewater variables such as pH, electrical conductivity (EC) and sulfate, chloride, dissolved CO2 and CH4 concentrations, as well as absolute abundances of methane- and sulfate-cycling microbial communities. The data were collected in spring and autumn 2019 after a storm surge with brackish water inflow in January 2019. Field sampling was conducted in the nature reserve Heiligensee and Hütelmoor in North-East Germany, close to the Southern Baltic Sea coast. We took peat cores using a Russian peat corer in addition to pore water diffusion samplers and plastic liners (length: 60cm; inner diameter 10 cm) at four locations along a transect from further inland towards the Baltic Sea. We wanted to compare the soil and pore water geochemistry as well as the microbial communities after the brackish water inflow to the common freshwater rewetting state. Pore water was extracted using pore water suction samplers in the lab and environmental variables were quantified with an ICP. Microbial samples were sampled from the peat core using sterile equipment. We used quantitative polymerase chain reaction (qPCR) to characterize pools of DNA and cDNA targeting total and putatively active bacteria and archaea. qPCR was performed on key functional genes of methane production (mcrA), aerobic methane oxidation (pmoA) and sulfate reduction (dsrB) in addition to the 16S rRNA gene for the absolute abundance of total prokaryotes. Furthermore, we retrieved soil plugs to determine the concentrations and isotopic signatures of dissolved trace gases (CO2/DIC and CH4) in the pore water.

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Sprache(n): eng - Englisch
 Datum: 2022
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: PANGAEA
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1594/PANGAEA.949824
GFZPOF: p4 T5 Future Landscapes
GFZPOFCCA: p4 CTA TERENO
 Art des Abschluß: -

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