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@ARTICLE{Dybzinski:860202,
      author       = {Dybzinski, Ray and Kelvakis, Angelo and McCabe, John and
                      Panock, Samantha and Anuchitlertchon, Kanyarak and
                      Vasarhelyi, Leah and Luke McCormack, M. and McNickle, Gordon
                      G. and Poorter, Hendrik and Trinder, Clare and Farrior,
                      Caroline E.},
      title        = {{H}ow are nitrogen availability, fine‐root mass, and
                      nitrogen uptake related empirically? {I}mplications for
                      models and theory},
      journal      = {Global change biology},
      volume       = {25},
      number       = {3},
      issn         = {1365-2486},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2019-00986},
      pages        = {885-899},
      year         = {2019},
      abstract     = {Understanding the effects of global change in terrestrial
                      communities requires an understanding of how limiting
                      resources interact with plant traits to affect productivity.
                      Here, we focus on nitrogen and ask whether plant community
                      nitrogen uptake rate is determined (a) by nitrogen
                      availability alone or (b) by the product of nitrogen
                      availability and fine‐root mass. Surprisingly, this is not
                      empirically resolved. We performed controlled microcosm
                      experiments and reanalyzed published pot experiments and
                      field data to determine the relationship between
                      community‐level nitrogen uptake rate, nitrogen
                      availability, and fine‐root mass for 46 unique
                      combinations of species, nitrogen levels, and growing
                      conditions. We found that plant community nitrogen uptake
                      rate was unaffected by fine‐root mass in $63\%$ of cases
                      and saturated with fine‐root mass in $29\%$ of cases
                      $(92\%$ in total). In contrast, plant community nitrogen
                      uptake rate was clearly affected by nitrogen availability.
                      The results support the idea that although plants may
                      over‐proliferate fine roots for individual‐level
                      competition, it comes without an increase in
                      community‐level nitrogen uptake. The results have
                      implications for the mechanisms included in coupled
                      carbon‐nitrogen terrestrial biosphere models (CN‐TBMs)
                      and are consistent with CN‐TBMs that operate above the
                      individual scale and omit fine‐root mass in equations of
                      nitrogen uptake rate but inconsistent with the majority of
                      CN‐TBMs, which operate above the individual scale and
                      include fine‐root mass in equations of nitrogen uptake
                      rate. For the much smaller number of CN‐TBMs that
                      explicitly model individual‐based belowground competition
                      for nitrogen, the results suggest that the relative (not
                      absolute) fine‐root mass of competing individuals should
                      be included in the equations that determine
                      individual‐level nitrogen uptake rates. By providing
                      empirical data to support the assumptions used in CN‐TBMs,
                      we put their global climate change predictions on firmer
                      ground.},
      cin          = {IBG-2},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:30536492},
      UT           = {WOS:000459456700009},
      doi          = {10.1111/gcb.14541},
      url          = {https://juser.fz-juelich.de/record/860202},
}