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@ARTICLE{Jones:844639,
      author       = {Jones, Davey L. and Olivera-Ardid, Sara and Klumpp, Erwin
                      and Knief, Claudia and Hill, Paul W. and Lehndorff, Eva and
                      Bol, Roland},
      title        = {{M}oisture activation and carbon use efficiency of soil
                      microbial communities along an aridity gradient in the
                      {A}tacama {D}esert},
      journal      = {Soil biology $\&$ biochemistry},
      volume       = {117},
      issn         = {0038-0717},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-02034},
      pages        = {68 - 71},
      year         = {2018},
      abstract     = {Due to their extreme aridity, high rate of UV irradiation
                      and low soil carbon (C) content, the soils of the Atacama
                      Desert represent one of the world's most hostile
                      environments for microbial life and its survival. Although
                      infrequent, climatic conditions may, however, prevail which
                      temporarily remove these stresses and allow life to briefly
                      flourish. In this study we investigated the response of soil
                      microbial communities to water and C availability across an
                      aridity gradient (semi-arid, arid, hyper-arid) within the
                      Atacama Desert. We simulated the impact of hyper-dry spells,
                      humid fogs and precipitation events on the activation of the
                      microbial community and the subsequent mineralization of low
                      (glucose) and high (plant residues) molecular weight C
                      substrates. Our results showed that mineralization rate
                      followed the trend: semi-arid > arid > hyper-arid. Some
                      glucose mineralization was apparent under hyper-arid
                      conditions (water activity, aw = 0.05), although this was
                      10-fold slower than under humid conditions and ca. 200-fold
                      slower than under wet conditions. A lag phase in CO2
                      production after glucose-C addition in the hyper-arid soils
                      suggested that mineralization was limited by the low
                      microbial biomass in these soils. No lag phase was apparent
                      in the corresponding semi-arid or arid soils. In contrast,
                      the breakdown of the plant residues was initially much
                      slower than for glucose and involved a much longer lag phase
                      in all soils, suggesting that mineralization was limited by
                      low exoenzyme activity, particularly in the humid and
                      hyper-dry soils. Our results also showed that microbial C
                      use efficiency followed the trend: hyper-arid > arid >
                      semi-arid. In conclusion, we have shown that even under
                      hyper-arid conditions, very low levels of microbial activity
                      and C turnover do occur. Further, the microbial communities
                      are capable of rapidly responding to available C once water
                      becomes more abundant, however, this response is both
                      biomass and metabolically limited in hyper-arid soils.},
      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:000424957100008},
      doi          = {10.1016/j.soilbio.2017.10.026},
      url          = {https://juser.fz-juelich.de/record/844639},
}