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  Congruent changes in microbial community dynamics and ecosystem methane fluxes following natural drought in two restored fens

Unger, V., Liebner, S., Koebsch, F., Yang, S., Horn, F., Sachs, T., Kallmeyer, J., Holger-Knorr, K., Rehder, G., Gottschalk, P., Jurasinski, G. (2021): Congruent changes in microbial community dynamics and ecosystem methane fluxes following natural drought in two restored fens. - Soil Biology and Biochemistry, 160, 108348.
https://doi.org/10.1016/j.soilbio.2021.108348

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 Creators:
Unger, Viktoria1, Author
Liebner, Susanne2, Author              
Koebsch, Franziska1, Author
Yang, Sizhong2, Author              
Horn, Fabian2, Author              
Sachs, T.3, Author              
Kallmeyer, J.2, Author              
Holger-Knorr, Klaus1, Author
Rehder, Gregor1, Author
Gottschalk, Pia1, Author
Jurasinski, Gerald1, Author
Affiliations:
1External Organizations, ou_persistent22              
23.7 Geomicrobiology, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146043              
31.4 Remote Sensing, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146028              

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Free keywords: Drought, Methane, Fen, Peatland, Methanogens, Methanotrophs
 Abstract: Both the frequency and intensity of drought events are expected to increase, with unresolved alterations to peatland methane cycling and the involved microbial communities. While existing studies have assessed drought effects via experimental approaches under controlled conditions, to our knowledge, no studies have examined the in-situ effects of natural drought in restored temperate fens. In this study, we used quantitative polymerase chain reaction (qPCR) and high throughput 16S rRNA gene amplicon sequencing of DNA and complementary DNA (cDNA) to determine the abundances and community structure of total and putatively active microbial communities following the 2018 European summer drought. Together with geochemical and methane flux data, we compared these results to a non-drought reference dataset. During drought, water level and methane flux rates decreased to a new recent minimum in both fens. This corresponded with pronounced shifts in porewater geochemistry. Microbial community composition in the drought year differed markedly, and was characterized by a greater relative and total abundance of aerobic methanotrophs, and, in one of the two sites, by a decrease in total methanogen abundance. In contrast to the non-drought reference years, type I methanotrophs were clearly more dominant than type II methanotrophs in both fens. cDNA sequencing confirmed the activity of type I methanotrophs during drought, with Methylomonaceae having the highest average relative abundance of bacterial cDNA transcripts. We show that changes in microbial community dynamics, porewater geochemistry, and ecosystem methane fluxes can be substantial following natural drought in restored fens, and provide the first in-situ evidence from a natural drought which suggests type I methanotroph populations are more active than type II methanotrophs in response to drought effects. Type I methanotrophs may represent a key microbial control over methane emissions in restored temperate fens subject to natural drought.

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 Dates: 20212021
 Publication Status: Finally published
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 Rev. Type: -
 Identifiers: DOI: 10.1016/j.soilbio.2021.108348
GFZPOF: p4 T5 Future Landscapes
OATYPE: Green Open Access
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Title: Soil Biology and Biochemistry
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 160 Sequence Number: 108348 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/140625
Publisher: Elsevier