Methane dynamics in an alpine fen: a field-based study on methanogenic and methanotrophic microbial communities

FEMS Microbiology Ecology
Alessandro G FranchiniJosef Zeyer

Abstract

Wetlands are important sources of the greenhouse gas methane (CH4). We provide an in situ study of CH4 dynamics in the permanently submerged soil of a Swiss alpine fen. Physico-chemical pore water analyses were combined with structural and microbiological analyses of soil cores at high vertical resolution down to 50 cm depth. Methanotrophs and methanogens were active throughout the depth profile, and highest abundance of active methanotrophs and methanogens [6.1 × 10(5) and 1.1 × 10(7) pmoA and mcrA transcripts (g soil)(-1), respectively] was detected in the uppermost 2 cm of the soil. Active methanotrophic communities in the near-surface zone, dominated by viable mosses, varied from the communities in the deeper zones, but further changes with depth were not pronounced. Apart from a distinct active methanogenic community in the uppermost sample, a decrease of acetoclastic Methanosaetaceae with depth was observed in concomitance with decreasing root surface area. Overall, root surface area correlated with mcrA transcript abundance and CH4 pore water concentrations, which peaked (137.1 μM) at 10 to 15 cm depth. Our results suggest that stimulation of methanogenesis by root exudates of vascular plants had a stronger influence on ...Continue Reading

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Citations

Nov 18, 2017·Nature Communications·Jordan C AngleKelly C Wrighton
Jun 21, 2015·Applied and Environmental Microbiology·Simrita CheemaRuth Henneberger
Apr 4, 2021·Applied and Environmental Microbiology·Danielle L RuppMerritt R Turetsky
Aug 20, 2021·Global Change Biology·Jared L WilmothXinning Zhang
Aug 27, 2021·The Science of the Total Environment·Binhao WangQingyun Yan

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