%0 Journal article %A Zak, Dominik %A Steffenhagen, Peggy %A Gelbrecht, Jörg %T Boden- und wasserchemische Veränderungen in degradierten Torfmoosmooren und Möglichkeiten ihrer Restaurierung unter Naturschutzaspekten – dargestellt am Beispiel Berliner Moore %R 10.23689/fidgeo-3018 %J TELMA - Berichte der Deutschen Gesellschaft für Moor- und Torfkunde %V 39 %X Abstract: Sphagnum fens of the north-eastern lowlands of Germany are mostly small-area and are of importance for nature conservation due to a specialised flora and fauna. But nearly all fens are endangered due to lowering of the groundwater table in their catchments. In contrast to the well documented changes of the flora and fauna knowledge on changes of chemical peat characteristics due to long-term desiccation of the fen types is poor. Furthermore, it is nearly unknown, whether peat mineralization will contribute to a risk enhancement of phosphorus release in case of fen rewetting as a restoration measure. Therefore, we investigated pore water chemistry of degraded Berlin Sphagnum fens with changing groundwater tables by means of the dialysis method. Additionally, a newly developed sequential chemical extraction procedure was applied to estimate the risk of phosphorus release after fen rewetting. Our results showed that nutrient pore water concentrations (P, N) of degraded fens with changing groundwater table are strongly enhanced compared with pristine fens (NE-Germany, NW Poland). Furthermore, in the upper soil layer with very decomposed peat large amounts of redox-sensible bound phosphorus had been accumulated. In case of long-term rewetting this phosphorus can be released due to anoxic conditions resulting in eutrophication of the originally oligotrophic-acid fens. Therefore, we suggest following management measures to protect and improve flora and fauna typically for Sphagnum fens: (1) Restoration of the hydrology of the fen drainage basin being the most important step, (2) partial removal of shrubs and small trees, and mowing in case of reed succession to support the reoligotrophication, and (3) top soil removal in those parts of the Sphagnum fen which consist of very decomposed peat in the upper soil to reduce the risk of P release after rewetting. %U http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/7332 %~ FID GEO-LEO e-docs