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Methane production in Minnesota peatlands.

R T Williams1, R L Crawford

  • 1University of Minnesota, Gray Freshwater Biological Institute, Navarre, Minnesota 55392.

Applied and Environmental Microbiology
|June 1, 1984
PubMed
Summary

Minnesota peatlands produce significant methane (CH(4)). Production rates varied with depth, temperature, and pH, with deeper layers showing optimal methane generation at cooler temperatures. Acetate addition inhibited methane production.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Geochemistry

Background:

  • Peatlands are significant global methane sources.
  • Understanding methanogenesis is crucial for climate change research.
  • Methane production is influenced by various environmental factors.

Purpose of the Study:

  • To quantify methane production rates in Minnesota peatlands.
  • To investigate the influence of depth, temperature, and pH on methanogenesis.
  • To identify factors stimulating or inhibiting methane production.

Main Methods:

  • Incubation of peat samples at different temperatures and pH levels.
  • Addition of various substrates (glucose, H(2)-CO(2), acetate) and nutrients.
  • Measurement of methane production rates (nmol CH(4)/g/h).
  • Analysis of dissolved gases at different depths.

Main Results:

  • Surface peats produced an average of 228 nmol CH(4)/g/h at 25°C.
  • Methanogenesis generally decreased with depth but sometimes increased in deeper fen peats.
  • Methane production was temperature-dependent, with optimal rates at 12°C in deeper layers.
  • Optimal methane production occurred at pH 6.0 for peats with initial pH 3.8-4.3.
  • Glucose and H(2)-CO(2) stimulated methanogenesis; acetate inhibited it.
  • Dissolved methane increased linearly with depth up to 210 cm.

Conclusions:

  • Methane production in peatlands is complex and influenced by multiple factors.
  • Depth, temperature, and pH significantly control methanogenesis rates.
  • Accumulation of metabolic end products may limit carbon turnover in peatlands.

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