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Related Experiment Video

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Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands

Visualizing Methane-Cycling Microbial Dynamics in Coastal Wetlands

Published on: January 31, 2025

Plants, microorganisms, and soil temperatures contribute to a decrease in methane fluxes on a drained Arctic

Min Jung Kwon¹, Felix Beulig², Iulia Ilie¹

¹Max Planck Institute for Biogeochemistry, Hans-Knöll-Str 10, 07745 Jena, Germany.

Global Change Biology

|December 1, 2016

Summary

This summary is machine-generated.

Arctic permafrost thaw alters hydrology, impacting methane (CH₄) emissions. Long-term drainage of Arctic floodplains significantly reduced CH₄ fluxes by modifying microbial communities, soil temperatures, and plant composition.

Keywords:

Siberia aerenchyma closed dynamic chamber fall methane fluxes methanogens

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Published on: September 6, 2018

Area of Science:

Environmental Science
Microbiology
Ecology

Background:

Arctic permafrost thaw due to rising temperatures creates diverse soil moisture conditions, impacting methane (CH₄) emissions.
Arctic wetlands are significant CH₄ sources, making the study of hydrological impacts on CH₄ fluxes crucial for climate change feedback predictions.

Purpose of the Study:

To investigate the long-term effects of a decade-long drying manipulation on an Arctic floodplain.
To analyze how drainage influences CH₄-associated microorganisms, soil thermal regimes, and plant communities.
To determine the subsequent modification of CH₄ fluxes during growing and non-growing seasons.

Main Methods:

Implemented a decade-long drying manipulation on an Arctic floodplain.
Monitored changes in microbial communities (methanogens and methanotrophs).
Assessed soil thermal regimes at various depths and plant community composition.
Quantified CH₄ fluxes during growing and non-growing seasons.

Main Results:

Drainage significantly reduced the abundance of both methanogens and methanotrophic bacteria, potentially decreasing overall CH₄ cycling.
Soil temperature changes included cooling in deep anoxic layers and warming in oxic topsoil, likely reducing methanogenesis and enhancing CH₄ oxidation.
A significant decrease in *Eriophorum angustifolium* (an aerenchymous plant) in drained areas led to increased CH₄ diffusion and oxidation, reducing net CH₄ fluxes.
Growing season CH₄ fluxes decreased by a factor of 20 in drained areas compared to controls.

Conclusions:

Long-term drainage of Arctic floodplains substantially reduces net CH₄ fluxes.
Modified microbial communities, altered soil temperatures, and shifts in plant composition collectively contribute to decreased CH₄ emissions.
While non-growing season CH₄ emissions showed a slight, insignificant increase, the overall impact of drainage is a significant reduction in CH₄ release.