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. Vegetation and hydrology are important controlling factors inpeatland methane dynamics. This study aimed at investigating the role ofvegetation components, sedges, dwarf shrubs, and Sphagnum mosses, in methane fluxesof a boreal fen under natural and experimental water level drawdownconditions. We measured the fluxes during growing seasons 2001–2004 using thestatic chamber technique in a field experiment where the role of theecosystem components was assessed via plant removal treatments. The firstyear was a calibration year after which the water level drawdown andvegetation removal treatments were applied. Under natural water levelconditions, plant-mediated fluxes comprised 68 %–78 % of the mean growingseason flux ( 1.73±0.17  g  CH4  m −2  month −1 from June toSeptember), of which Sphagnum mosses and sedges accounted for one-fourth and three-fourths,respectively. The presence of dwarf shrubs, on the other hand, had aslightly attenuating effect on the fluxes. In water level drawdownconditions, the mean flux was close to zero ( 0.03±0.03  g  CH4  m −2  month −1 ) and the presence and absence of the plant groups had anegligible effect. In conclusion, water level acted as a switch; only innatural water level conditions did vegetation regulate the net fluxes. Theresults are relevant for assessing the response of fen peatland fluxes tochanging climatic conditions, as water level drawdown and the consequentvegetation succession are the major projected impacts of climate change onnorthern peatlands.

Interacting effects of vegetation components and water level on methane dynamics in a boreal fen