CH4 emission from Finnish wetlands was simulated by CH4MODwetland.
We recalibrated the vegetation parameters of graminoids, shrubs and Sphagnum.
Simulated CH4 variations agreed well with the eddy-covariance observations.
Annual CH4 emissions were reasonably simulated in different years and sites.
Parameterization of different vegetation process was essential in long-term CH4 estimates.