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Anthropogenic drainage of peatlands releases additional greenhouse gases to theatmosphere, and dissolved carbon (C) and nutrients to downstream ecosystems.Rewetting drained peatlands offers a possibility to reduce nitrogen (N) andC losses. In this study, we investigate the impact of drainage and rewettingon the cycling of dissolved C and N as well as on dissolved gases, over aperiod of 1 year and a period of 4 months. We chose four sites within oneAtlantic bog complex: a near-natural site, two drained grasslands withdifferent mean groundwater levels and a former peat cutting area rewetted10 years ago.  Our results clearly indicate that long-term drainage has increased theconcentrations of dissolved organic carbon (DOC), ammonium, nitrate anddissolved organic nitrogen (DON) compared to the near-natural site. DON andammonium contributed the most to the total dissolved nitrogen. Nitrateconcentrations below the mean groundwater table were negligible. Theconcentrations of DOC and N species increased with drainage depth. In thedeeply-drained grassland, with a mean annual water table of 45 cm belowsurface, DOC concentrations were twice as high as in the partially rewettedgrassland with a mean annual water table of 28 cm below surface. The deeplydrained grassland had some of the highest-ever observed DOC concentrations of195.8 ± 77.3 mg L<sup>−1</sup> with maximum values of>400 mg L<sup>−1</sup>. In general, dissolved organic matter (DOM) at thedrained sites was enriched in aromatic moieties and showed a higherdegradation status (lower DOC to DON ratio) compared to the near-naturalsite. At the drained sites, the C to N ratios of the uppermost peat layerwere the same as of DOM in the peat profile. This suggests that the uppermostdegraded peat layer is the main source of DOM. Nearly constant DOM qualitythrough the profile furthermore indicated that DOM moving downwards throughthe drained sites remained largely biogeochemically unchanged. Unlike DOMconcentration, DOM quality and dissolved N species distribution were similarin the two grasslands and thus unaffected by the drainage depth.  Methane production during the winter months at the drained sites was limitedto the subsoil, which was quasi-permanently water saturated. The recovery ofthe water table in the winter months led to the production of nitrous oxidearound mean water table depth at the drained sites.  The rewetted and the near-natural site had comparable DOM quantity andquality (DOC to DON ratio and aromaticity). 10 years after rewetting quasi-pristine biogeochemical conditions have been re-established undercontinuously water logged conditions in the former peat cut area. Only theelevated dissolved methane and ammonium concentrations reflected the formerdisturbance by drainage and peat extraction. Rewetting via polder techniqueseems to be an appropriate way to revitalize peatlands on longer timescalesand to improve the water quality of downstream water bodies

High soil solution carbon and nitrogen concentrations in a drained Atlantic bog are reduced to natural levels by 10 years of rewetting