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Methane emissions from tree stems in neotropical peatlands.

Sofie Sjögersten1, Andy Siegenthaler2, Omar R Lopez3,4

  • 1School of Biosciences, The University of Nottingham, Sutton Bonington, Loughborough, LE12 5RD, UK.

The New Phytologist
|September 10, 2019
PubMed
Summary

Tree stems in Neotropical peatlands are a significant source of methane (CH4) emissions, contributing up to 30% of the total. Emissions vary seasonally and by tree species, highlighting stems as a crucial methane pathway.

Keywords:
greenhouse gasesmethaneneotropicspeatlandstree emissionstree speciestropical forest

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Area of Science:

  • Ecology
  • Biogeochemistry
  • Environmental Science

Background:

  • Neotropical peatlands are major sources of atmospheric methane (CH4).
  • Methane (CH4) fluxes from tree stems in these ecosystems have not been previously quantified.
  • Understanding CH4 pathways is critical for accurate climate modeling.

Purpose of the Study:

  • To investigate methane (CH4) emissions from tree stems in Neotropical peatlands.
  • To determine the contribution of stem emissions to overall ecosystem CH4 flux.
  • To identify factors influencing CH4 emissions from tree stems.

Main Methods:

  • Quantified CH4 fluxes from stems of five tree species in two common Neotropical peatland forest types in Panama.
  • Measured stem CH4 emissions in relation to season, water table, temperature, and soil CH4 flux.
  • Analyzed the influence of species identity, stem diameter, and height on CH4 emissions.

Main Results:

  • Tree stems accounted for up to 30% of net ecosystem CH4 emissions.
  • Peak CH4 fluxes occurred during the wet season with high water tables and lower temperatures.
  • Emissions were highest from Campnosperma panamensis, declining exponentially with stem height.
  • Species, stem diameter, water level, soil temperature, and soil CH4 flux explained 54% of stem CH4 variance.

Conclusions:

  • Tree stem CH4 emission is a significant, previously underestimated pathway in Neotropical peatlands.
  • Seasonal variations and forest type strongly influence stem CH4 emissions.
  • Campnosperma panamensis forests exhibit particularly high landscape-level CH4 emissions despite lower cover.