Methane and Nitrous Oxide Cycles in Forests

Approach

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  Flux measurements

  

  We have measured the CH₄ flux with static chamber method at the forest floor, and from stems and shoots of common boreal trees (Betula pendula, B. pubescens, Pinus sylvestris, and Picea abies).

  The CH₄ flux above the forest canopy has been measured with concentration gradient (modified Bowen-ratio) and eddy covariance techniques.

  Flux measurement campaigns

  2017 June–August | Hyytiälä

  • Stems of pine, spruce and birch
  • Shoots of pine and birch

  2017 June–September | Lettosuo

  • Stems of pine, spruce and birch

  2016 June–September | Lettosuo

  • Stems of pine, spruce and birch

  2015 April–June | Hyytiälä

  • Stems of pine, spruce and birch
  • Shoots of spruce and birch

  2014 June – 2015 May | Hyytiälä

  • Stems of pine, spruce and birch

  2014 May–October | Hyytiälä

  • Forest floor at the mast footprint area

  2013 May–September | Hyytiälä

  • Forest floor at the mast footprint area

  Microbes

  Current work with plant and soil samples from Hyytiälä and Lettosuo:

  • Detection and quantification of functional genes for methanogens (mcrA) and methanotrophs (pmoA)
  • Analysis of methanogen and methanotroph communities (Miseq high-throughput sequencing)
  • Incubation experiments for the potential CH₄ production/oxidation in different conditions

  In the future:

  • Analysis of fungal communities and their role in CH₄ emissions
  • Analysis of microbes related to N₂O emissions