Löfgren, A., Saetre, P.
Proceedings of the 14th International Peat Congress
dic, doc, mire, rich-fen
Löfgren, Saetre 2012: DIC and DOC in Three Mires Representing Different Peatland Development Stages in a Calcareous Area of Cent
Theme I. Inventory, stratigraphy and conservation of mires and peatlands
In this study we examined the variation in DIC and DOC concentration during mire ontogeny, by sampling three mires at a coastal area with land upheaval, a flat topography and calcareous soil in central Sweden (site Forsmark). Water samples were collected from all three mires at two different depths in the anoxic layer of the mires, by extracting water from peat obtained with a peat corer. DIC concentrations where related to the age and the depth of the mires, with the lowest concentrations in the oldest mire and in the shallow samples. DIC concentrations were also positively related to the electrolytical conductivity of the pore water within and between the mires, reflecting the influence of groundwater rich in calcium cations. DOC concentrations varied to a less extent, but were highest in the oldest mire.