Marja Maljanen, Jyrki Hytönen, Päivi Mäkiranta, Jukka Laine, Pertti J. Martikainen
Proceedings of the 14th International Peat Congress
carbon-dioxide, emission, methane, nitrous-oxide, water-table
Theme III. Agricultural use of peat and peatlands
Peat soils drained for agriculture are significant sources of carbon dioxide (CO2). Leaving these soils abandoned could be an option to mitigate GHG emissions. We measured net CO2 exchange and fluxes of CH4 and N2O for five abandoned sites during three years. Annually, the sites were either small net sinks or sources of CO2 and CH4 (-7.8 – 530 g CO2-C m-2 and -0.41 – 1.8 g CH4 m-2). The net (CH4 + CO2 + N2O) emissions as CO2 equivalents were lower than in cultivated peat soils and were lowest in the wet year when photosynthesis was favoured over respiration.