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@ARTICLE{Wu:902969,
      author       = {Wu, Di and Senbayram, Mehmet and Moradi, Ghazal and
                      Mörchen, Ramona and Knief, Claudia and Klumpp, Erwin and
                      Jones, Davey L. and Well, Reinhard and Chen, Ruirui and Bol,
                      Roland},
      title        = {{M}icrobial potential for denitrification in the hyperarid
                      {A}tacama {D}esert soils},
      journal      = {Soil biology $\&$ biochemistry},
      volume       = {157},
      issn         = {0038-0717},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2021-04715},
      pages        = {108248 -},
      year         = {2021},
      abstract     = {The hyperarid soils of the Atacama Desert, Chile, contain
                      the largest known nitrate deposits in the world. They also
                      represent one of the most hostile environments for microbial
                      life anywhere in the terrestrial biosphere. Despite known
                      for its extreme dryness, several heavy rainfall events
                      causing localised flash flooding have struck Atacama Desert
                      core regions during the last five years. It remains unclear,
                      however, whether these soils can support microbial
                      denitrification. To answer this, we sampled soils along a
                      hyperaridity gradient in the Atacama Desert and conducted
                      incubation experiments using a robotized continuous flow
                      system under a He/O2 atmosphere. The impacts of four
                      successive extreme weather events on soil-borne N2O and N2
                      emissions were investigated, i) water addition, ii) NO3−
                      addition, iii) labile carbon (C) addition, and iv) oxygen
                      depletion. The 15N–N2O site-preference (SP) approach was
                      further used to examine the source of N2O produced.
                      Extremely low N2O fluxes were detected shortly after water
                      and NO3− addition, whereas pronounced N2O and N2 emissions
                      were recorded after labile-C (glucose) amendment in all
                      soils. Under anoxia, N2 emissions increased drastically
                      while N2O emissions decreased concomitantly, indicating the
                      potential for complete denitrification at all sites.
                      Although increasing aridity significantly reduced soil
                      bacterial richness, microbial potential for denitrification
                      and associated gene abundance (i.e., napA, narG, nirS, nirK,
                      cnorB, qnorB and nosZ) was not affected. The N2O15N site
                      preference values based on two end-member model suggested
                      that fungal and bacterial denitrification co-contributed to
                      N2O production in less arid sites, whereas bacterial
                      denitrification dominated with increasing aridity. We
                      conclude that soil denitrification functionality is
                      preserved even with lowered microbial richness in the
                      extreme hyperarid Atacama Desert. Future changes in land-use
                      or extreme climate events therefore have a potential to
                      destabilize the immense reserves of nitrate and induce
                      significant N2O losses in the region.},
      cin          = {IBG-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000643701100016},
      doi          = {10.1016/j.soilbio.2021.108248},
      url          = {https://juser.fz-juelich.de/record/902969},
}