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@ARTICLE{CastellanoHinojosa:864357,
      author       = {Castellano-Hinojosa, Antonio and Loick, Nadine and Dixon,
                      Elizabeth and Matthews, G. Peter and Lewicka-Szczebak,
                      Dominika and Well, Reinhard and Bol, Roland and Charteris,
                      Alice and Cardenas, Laura},
      title        = {{I}mproved isotopic model based on 15 {N} tracing and
                      {R}ayleigh-type isotope fractionation for simulating
                      differential sources of {N} 2 {O} emissions in a clay
                      grassland soil},
      journal      = {Rapid communications in mass spectrometry},
      volume       = {33},
      number       = {5},
      issn         = {0951-4198},
      address      = {New York, NY},
      publisher    = {Wiley Interscience},
      reportid     = {FZJ-2019-04153},
      pages        = {449 - 460},
      year         = {2019},
      abstract     = {RationaleIsotopic signatures of N2O can help distinguish
                      between two sources (fertiliser N or endogenous soil N) of
                      N2O emissions. The contribution of each source to N2O
                      emissions after N‐application is difficult to determine.
                      Here, isotopologue signatures of emitted N2O are used in an
                      improved isotopic model based on Rayleigh‐type
                      equations.MethodsThe effects of a partial $(33\%$ of surface
                      area, treatment 1c) or total $(100\%$ of surface area,
                      treatment 3c) dispersal of N and C on gaseous emissions from
                      denitrification were measured in a laboratory incubation
                      system (DENIS) allowing simultaneous measurements of NO,
                      N2O, N2 and CO2 over a 12‐day incubation period. To
                      determine the source of N2O emissions those results were
                      combined with both the isotope ratio mass spectrometry
                      analysis of the isotopocules of emitted N2O and those from
                      the 15N‐tracing technique.ResultsThe spatial dispersal of
                      N and C significantly affected the quantity, but not the
                      timing, of gas fluxes. Cumulative emissions are larger for
                      treatment 3c than treatment 1c. The 15N‐enrichment
                      analysis shows that initially $~70\%$ of the emitted N2O
                      derived from the applied amendment followed by a constant
                      decrease. The decrease in contribution of the fertiliser
                      N‐pool after an initial increase is sooner and larger for
                      treatment 1c. The Rayleigh‐type model applied to N2O
                      isotopocules data (δ15Nbulk‐N2O values) shows poor
                      agreement with the measurements for the original one‐pool
                      model for treatment 1c; the two‐pool models gives better
                      results when using a third‐order polynomial equation. In
                      contrast, in treatment 3c little difference is observed
                      between the two modelling approaches.ConclusionsThe
                      importance of N2O emissions from different N‐pools in soil
                      for the interpretation of N2O isotopocules data was
                      demonstrated using a Rayleigh‐type model. Earlier
                      statements concerning exponential increase in native soil
                      nitrate pool activity highlighted in previous studies should
                      be replaced with a polynomial increase with dependency on
                      both N‐pool sizes.},
      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},
      pubmed       = {pmid:30561863},
      UT           = {WOS:000459797600007},
      doi          = {10.1002/rcm.8374},
      url          = {https://juser.fz-juelich.de/record/864357},
}