We studied GHG emissions along water-level gradients of two inundated cutover fens with closed chambers. N2
O fluxes were negligible. CO2
fluxes were controlled by vegetation composition and plant productivity, which in turn depended on water level and nutrient conditions. CH4
fluxes from mesotrophic sites were low and largely compensated for by CO2
uptake. Eutrophic sites were strong CH4
sources, and GHG balances depended on the plant's net C sink, which strongly differed between species.