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Temperature-induced increase in methane release from peat bogs: a mesocosm experiment.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Climate Science

Background:

  • Peat bogs at mid- to high latitudes are sensitive to projected climate change, with expected increases in temperature and precipitation.
  • Methane emissions from peatlands are regulated by methane-producing microbes (methanogens) and methane-oxidizing bacteria (methanotrophs).
  • Sphagnum mosses host symbiotic methanotrophs that play a crucial role in mitigating methane release.

Purpose of the Study:

  • To investigate the impact of increasing temperatures on methane production and oxidation in peat bogs.
  • To quantify the temperature-dependent efficiency of Sphagnum-associated methanotrophs in consuming methane.
  • To assess the net effect of warming on methane flux from peat ecosystems.

Main Methods:

  • Intact peat cores with actively growing Sphagnum were incubated across a temperature gradient (5°C to 25°C).
  • Methane flux was measured over two months to determine net emissions.
  • Experiments were conducted with and without Sphagnum to isolate the role of associated methanotrophs.

Main Results:

  • Net methane flux increased significantly with rising temperatures, indicating methanotrophs could not fully compensate for enhanced methanogenesis.
  • Methane fluxes were higher in cores without Sphagnum, confirming the plant-associated microbes' critical role.
  • The efficiency of methane retention by the Sphagnum-methanotroph consortium decreased from 98% at 5°C to approximately 50% at 25°C.

Conclusions:

  • Increasing temperatures in peat bogs reduce the effectiveness of methanotrophs in consuming methane.
  • The Sphagnum-methanotroph partnership is a vital but temperature-sensitive methane filter.
  • Enhanced methane release from warming peatlands could create a positive feedback loop, accelerating climate change.