Sabine Jordan, Monika Strömgren, Elve Lode, Lars Lundin & Torbjörn Nilsson
Proceedings of the 14th International Peat Congress
ch4, co2, n2o, reclamation, transects
Theme X. Peatland carbon budgets and greenhouse gas (GHG) fluxes
Two rewetted, former cut-over peatlands were investigated for their greenhouse gas (GHG) emissions. The closed-chamber method was used. In the nutrient-rich Västkärr fen, CO2-fluxes decreased along the moisture gradient from vegetated soil towards open water. CH4 emissions varied with seasons: highest in June 2009 and in the open water with a decreasing trend towards the vegetated soil. N2O emissions were observed occasionally: highest in October 2008 and in the driest parts of the lake littoral zone with a decreasing trend towards the open water.
In the nutrient-poor Porla wetland CO2- and CH4-fluxes followed a seasonal cycle at all sites, from low fluxes in spring over high emissions in summer to low outputs in autumn. The bare peat emitted no CH4 whereas the wet Eriophorum vaginatum tussocks released the highest amounts during summer.