Forest ecosystem changes from annual methane source to sink depending on late summer water balance

Julie K. Shoemaker*, Trevor F. Keenan, David Y. Hollinger, Andrew D. Richardson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Forests dominate the global carbon cycle, but their role in methane (CH4) biogeochemistry remains uncertain. We analyzed whole-ecosystem CH4 fluxes from 2 years, obtained over a lowland evergreen forest in Maine, USA. Gross primary productivity provided the strongest correlation with the CH4 flux in both years, with an additional significant effect of soil moisture in the second, drier year. This forest was a neutral to net source of CH4 in 2011 and a small net sink in 2012. Interannual variability in the summer hydrologic cycle apparently shifts the ecosystem from being a net source to a sink for CH4. The small magnitude of the CH4 fluxes and observed control or CH4 fluxes by forest productivity and summer precipitation provide novel insight into the CH4 cycle in this globally important forest ecosystem.

Original languageEnglish
Pages (from-to)673-679
Number of pages7
JournalGeophysical Research Letters
Volume41
Issue number2
DOIs
Publication statusPublished - 28 Jan 2014

Keywords

  • carbon
  • climate
  • forests
  • methane
  • models

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