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Does biodiversity increase spatial stability in plant community biomass?

Alexandra Weigelt1, Jens Schumacher, Christiane Roscher

  • 1Institute of Ecology, University of Jena, Dornburger Str. 159, D-07743 Jena, Germany. alexandra.weigelt@uni-jena.de

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Biodiversity stabilizes grassland biomass production across space, especially when considering functional diversity (weighted Rao's Q). Specific traits like rooting depth and clonal growth are key to this spatial stability.

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Area of Science:

  • Ecology
  • Plant Ecology
  • Ecosystem Function

Background:

  • Biodiversity is hypothesized to influence ecosystem stability.
  • Spatial variability in biomass production can impact ecosystem resilience.
  • Understanding the drivers of spatial stability is crucial for predicting ecosystem responses to environmental change.

Purpose of the Study:

  • To test if biodiversity reduces spatial variability in grassland biomass production.
  • To identify which components of biodiversity contribute to spatial stability.
  • To investigate the influence of scale and heterogeneity on productivity variability.

Main Methods:

  • Experimental grassland plots were used to measure biomass production.
  • Spatial variability of biomass production was assessed across subplots.
  • Functional diversity was quantified using weighted Rao's Q.
  • Species richness and functional group richness were also analyzed.

Main Results:

  • Functional diversity (weighted Rao's Q) significantly decreased spatial variability in biomass production.
  • Diversity in rooting depth and clonal growth form were key stabilizing components of functional diversity.
  • Species richness and functional group richness did not significantly affect spatial variability.
  • Spatial variability of productivity increased significantly as the harvested area size decreased.

Conclusions:

  • Functional diversity, particularly trait-based diversity, enhances the spatial stability of grassland biomass production.
  • Complementary use of spatial niches by diverse communities may drive this stabilization.
  • The effect of functional diversity on spatial stability is less pronounced than on temporal stability.
  • Small-scale heterogeneity is an important factor influencing productivity variability in grasslands.