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@ARTICLE{Guiz:255570,
      author       = {Guiz, Jordan and Hillebrand, Helmut and Borer, Elizabeth T.
                      and Abbas, Maike and Ebeling, Anne and Weigelt, Alexandra
                      and Oelmann, Yvonne and Fornara, Dario and Wilcke, Wolfgang
                      and Temperton, Vicky and Weisser, Wolfgang W.},
      title        = {{L}ong-term effects of plant diversity and composition on
                      plant stoichiometry},
      journal      = {Oikos},
      volume       = {125},
      number       = {5},
      issn         = {0030-1299},
      address      = {Oxford},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2015-05711},
      pages        = {613–621},
      year         = {2016},
      abstract     = {Plant elemental composition can indicate resource
                      limitation, and changes in key elemental ratios (e.g. plant
                      C:N ratios) can influence rates including herbivory,
                      nutrient recycling, and pathogen infection. Although plant
                      stoichiometry can influence ecosystem-level processes, very
                      few studies have addressed whether and how plant C:N
                      stoichiometry changes with plant diversity and composition.
                      Here, using two long-term experimental manipulations of
                      plant diversity (Jena and Cedar Creek), we test whether
                      plant richness (species and functional groups) or
                      composition (functional group proportions) affects temporal
                      trends and variability of community-wide C:N
                      stoichiometry.Site fertility determined the initial
                      community-scale C:N ratio. Communities growing on N-poor
                      soil (Cedar Creek) began with higher C:N ratios than
                      communities growing on N-rich soil (Jena). However,
                      site-level plant C:N ratios converged through time, most
                      rapidly in high diversity plots. In Jena, plant community
                      C:N ratios increased. This temporal trend was stronger with
                      increasing richness. However, temporal variability of C:N
                      decreased as plant richness increased. In contrast, C:N
                      decreased over time at Cedar Creek, most strongly at high
                      species and functional richness, whereas the temporal
                      variability of C:N increased with both measures of diversity
                      at this site.Thus, temporal trends in the mean and
                      variability of C:N were underlain by concordant changes
                      among sites in functional group proportions. In particular,
                      the convergence of community-scale C:N over time at these
                      very different sites was mainly due to increasing
                      proportions of forbs at both sites, replacing high mean C:N
                      (C4 grasses, Cedar Creek) or low C:N (legumes, Jena)
                      species. Diversity amplified this convergence; although
                      temporal trends differed in sign between the sites, these
                      trends increased in magnitude with increasing species
                      richness. Our results suggest a predictive mechanistic link
                      between trends in plant diversity and functional group
                      composition and trends in the many ecosystem rates that
                      depend on aboveground community C:N.},
      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},
      UT           = {WOS:000375087800002},
      doi          = {10.1111/oik.02504},
      url          = {https://juser.fz-juelich.de/record/255570},
}