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@ARTICLE{Meyer:820872,
      author       = {Meyer, Nele and Welp, Gerhard and Bornemann, Ludger and
                      Amelung, Wulf},
      title        = {{M}icrobial nitrogen mining affects spatio-temporal
                      patterns of substrate-induced respiration during seven years
                      of bare fallow},
      journal      = {Soil biology $\&$ biochemistry},
      volume       = {104},
      issn         = {0038-0717},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2016-06136},
      pages        = {175 - 184},
      year         = {2017},
      abstract     = {Decomposition of soil organic matter (SOM) is regulated by
                      microbial activity, which strongly depends on the
                      availability of carbon (C) and nitrogen (N). Yet, the
                      special role of N on soil organic carbon (SOC)
                      mineralization is still under discussion. The recent concept
                      of microbial N mining predicts increasing SOC mineralization
                      under N-deficiency, which is in contrast to the generally
                      accepted stoichiometric decomposition theory.Following this
                      concept we hypothesized that spatio-temporal patterns of
                      microbial activity are controlled by SOC and N contents, but
                      that microorganisms maintain their functionality to
                      mineralize C under conditions of N deficiency because of
                      microbial N mining.To test this hypothesis, we added glucose
                      to an arable soil that had experienced increasing losses of
                      C3-derived SOM after one, three, and seven years of bare
                      fallow and measured spatio-temporal patterns of
                      substrate-induced respiration (SIR). The SIR measurements
                      were performed with and without additions of mineral N.
                      Selected samples were treated with C4 sugar in order to
                      trace the source of CO2 emissions (sugar vs. SOC-derived) by
                      natural 13C abundance measurements. Sugar additions were
                      repeated after the first SIR experiment to derive
                      information on changing N availability.The results showed
                      that spatial patterns of SIR were not consistently regulated
                      by SOC and N. On a temporal scale, the maximum microbial
                      growth peak declined by $47\%$ from one year bare fallow to
                      seven years bare fallow but soils often developed a second
                      growth phase in the 7th year of fallow. Intriguingly, the
                      maximum microbial growth peak increased again when N was
                      added together with the glucose and no second growth peak
                      occurred. A similar effect was observed after repeated sugar
                      additions but without N additions. The 13C experiment
                      revealed a slightly higher contribution of SOC-derived CO2
                      in N-deficient samples $(16.7\%)$ than in N-fertilized
                      samples $(14.6\%).We$ conclude that the first SIR peak was
                      related to the supply of immediately available N while the
                      second growth phase indicated a delayed release of N, due to
                      N mining from SOM. Hence, microbes were able to compensate
                      for initial N limitation and there was no significant change
                      in the overall substrate-induced CO2 release with proceeding
                      time under fallow.},
      cin          = {IBG-3},
      ddc          = {570},
      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:000389555900017},
      doi          = {10.1016/j.soilbio.2016.10.019},
      url          = {https://juser.fz-juelich.de/record/820872},
}