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@ARTICLE{Wu:282872,
      author       = {Wu, Di and Köster, Jan Reent and Cárdenas, Laura M. and
                      Brüggemann, Nicolas and Lewicka-Szczebak, Dominika and Bol,
                      Roland},
      title        = {{N}$_ {2}${O} source partitioning in soils using $^{15}$
                      {N} site preference values corrected for the {N}$_ {2}${O}
                      reduction effect},
      journal      = {Rapid communications in mass spectrometry},
      volume       = {30},
      number       = {5},
      issn         = {0951-4198},
      address      = {New York, NY},
      publisher    = {Wiley Interscience},
      reportid     = {FZJ-2016-01619},
      pages        = {620 - 626},
      year         = {2016},
      abstract     = {RationaleThe aim of this study was to determine the impact
                      of isotope fractionation associated with N2O reduction
                      during soil denitrification on N2O site preference (SP)
                      values and hence quantify the potential bias on SP-based N2O
                      source partitioning.MethodsThe N2O SP values (n = 431)
                      were derived from six soil incubation studies in N2-free
                      atmosphere, and determined by isotope ratio mass
                      spectrometry (IRMS). The N2 and N2O concentrations were
                      measured directly by gas chromatography. Net isotope effects
                      (NIE) during N2O reduction to N2 were compensated for using
                      three different approaches: a closed-system model, an
                      open-system model and a dynamic apparent NIE function. The
                      resulting SP values were used for N2O source partitioning
                      based on a two end-member isotopic mass balance.ResultsThe
                      average SP0 value, i.e. the average SP values of N2O prior
                      to N2O reduction, was recalculated with the closed-system
                      model, resulting in −2.6 ‰ (±9.5), while the
                      open-system model and the dynamic apparent NIE model gave
                      average SP0 values of 2.9 ‰ (±6.3) and 1.7 ‰ (±6.3),
                      respectively. The average source contribution of N2O from
                      nitrification/fungal denitrification was $18.7\%$ (±21.0)
                      according to the closed-system model, while the open-system
                      model and the dynamic apparent NIE function resulted in
                      values of $31.0\%$ (±14.0) and $28.3\%$ (±14.0),
                      respectively.ConclusionsUsing a closed-system model with a
                      fixed SP isotope effect may significantly overestimate the
                      N2O reduction effect on SP values, especially when N2O
                      reduction rates are high. This is probably due to soil
                      inhomogeneity and can be compensated for by the application
                      of a dynamic apparent NIE function, which takes the variable
                      reduction rates in soil micropores into account},
      cin          = {IBG-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000369996300008},
      pubmed       = {pmid:26842583},
      doi          = {10.1002/rcm.7493},
      url          = {https://juser.fz-juelich.de/record/282872},
}