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@ARTICLE{Senbayram:857125,
      author       = {Senbayram, Mehmet and Well, Reinhard and Bol, Roland and
                      Chadwick, David R. and Jones, David L. and Wu, Di},
      title        = {{I}nteraction of straw amendment and soil {NO}3− content
                      controls fungal denitrification and denitrification product
                      stoichiometry in a sandy soil},
      journal      = {Soil biology $\&$ biochemistry},
      volume       = {126},
      issn         = {0038-0717},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-06369},
      pages        = {204 - 212},
      year         = {2018},
      abstract     = {The return of agricultural crop residues are vital to
                      maintain or even enhance soil fertility. However, the
                      influence of application rate of crop residues on
                      denitrification and its related gaseous N emissions is not
                      fully understood. We conducted a fully robotized continuous
                      flow incubation experiment using a Helium/Oxygen atmosphere
                      over 30 days to examine the effect of maize straw
                      application rate on: i) the rate of denitrification, ii)
                      denitrification product stoichiometry N2O/(N2O+N2), and iii)
                      the contribution of fungal denitrification to N2O fluxes.
                      Five treatments were established using sieved, repacked
                      sandy textured soil; i) non-amended control, ii) nitrate
                      only, iii) low rate of straw + nitrate, iv) medium rate of
                      straw + nitrate, and iv) high rate of straw + nitrate (n =
                      3). We simultaneously measured NO, N2O as well as direct N2
                      emissions and used the N2O 15N site preference signatures of
                      soil-emitted N2O to distinguish N2O production from fungal
                      and bacterial denitrification. Uniquely, soil NO3−
                      measurements were also made throughout the incubation.
                      Emissions of N2O during the initial phase of the experiment
                      (0–13 days) increased almost linearly with increasing rate
                      of straw incorporation and with (almost) no N2 production.
                      However, the rate of straw amendment was negatively
                      correlated with N2O, but positively correlated with N2
                      fluxes later in the experimental period (13–30 days). Soil
                      NO3− content, in all treatments, was identified as the
                      main factor responsible for the shift from N2O production to
                      N2O reduction. Straw amendment immediately lowered the
                      proportion of N2O from bacterial denitrification, thus
                      implying that more of the N2O emitted was derived from fungi
                      $(18 ± 0.7\%$ in control and up to $40 ± 3.0\%$ in
                      high straw treatments during the first 13 days). However,
                      after day 15 when soil NO3− content decreased to <40 mg
                      NO3−-N kg−1 soil, the N2O 15N site preference values of
                      the N2O produced in the medium straw rate treatment showed a
                      sharp declining trend 15 days after onset of experiment
                      thereby indicating a clear shift towards a more dominant
                      bacterial source of N2O. Our study singularly highlights the
                      complex interrelationship between soil NO3− kinetics, crop
                      residue incorporation, fungal denitrification and N2O/(N2O +
                      N2) ratio. Overall we found that the effect of crop residue
                      applications on soil N2O and N2 emissions depends mainly on
                      soil NO3− content, as NO3− was the primary regulator of
                      the N2O/(N2O + N2) product ratio of denitrification.
                      Furthermore, the application of straw residue enhanced
                      fungal denitrification, but only when the soil NO3−
                      content was sufficient to supply enough electron acceptors
                      to the denitrifiers.},
      cin          = {IBG-3},
      ddc          = {540},
      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:000447580800023},
      doi          = {10.1016/j.soilbio.2018.09.005},
      url          = {https://juser.fz-juelich.de/record/857125},
}