@article{1252034,
  abstract     = {{Gaseous nitrogen exchanges from undrained peat soils and the effect of external nitrate input are poorly understood. This paper reports net N-2, and N2O exchanges as well as the short-term responses to nitrate addition from contrasting tussock and hollow soil habitats in an undrained monolith fen ecosystem located in northeast Poland. Gaseous N exchange rates were quantified by means of a He substitution technique. The net N-2 production in hollows (2.53 mg N m(-2) hour(-1)) was significantly higher than in tussocks (1.04 mg N m(-2) hour(-1)). Hollows also constituted a marked N2O sink (-3.04 mu g N m(-2) hour(-1)), while tussocks were a source for atmospheric N2O (2.08 mu g N m(-2) hour(-1)). Following amendment by NO3-, at a rate similar to atmospheric NO3- deposition (wet + dry), hollows showed a drastic shift to net production of N2O but a non-significant increase in N-2 production. In tussocks only a minor increase of N-2 and N2O production was observed after NO3- addition. This study emphasizes the influence of physico-chemical conditions and biotic resource competition on the rates and responses of microbial denitrification in undrained fen ecosystems. Inferring a simple field-scale estimation of gaseous N emission suggests that undrained, monolith fen ecosystems constitute substantial sources of N-2 (1.79 mg N m(-2) hour(-1)) and considerable sinks for N2O (-0.96 mu g N m(-2) hour(-1)). These findings are of importance to further improve greenhouse gas budgeting and assess the impacts of global change on undrained fen ecosystems.}},
  author       = {{Roobroeck, Dries and Butterbach-Bahl, Klaus and Brüggemann, N and Boeckx, Pascal}},
  issn         = {{1351-0754}},
  journal      = {{EUROPEAN JOURNAL OF SOIL SCIENCE}},
  keywords     = {{WATER-TABLE,BOREAL PEATLANDS,DENITRIFICATION RATES,RESTORED PEATLAND,CLIMATE-CHANGE,N2O EMISSIONS,SOIL,MINERALIZATION,DYNAMICS,WETLANDS}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{662--670}},
  title        = {{Dinitrogen and nitrous oxide exchanges from an undrained monolith fen: short-term responses following nitrate addition}},
  url          = {{http://doi.org/10.1111/j.1365-2389.2010.01269.x}},
  volume       = {{61}},
  year         = {{2010}},
}

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