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Higher tree diversity is linked to higher tree mortality.

Eric B Searle1, Han Y H Chen2, Alain Paquette1

  • 1Département des sciences biologiques, Centre for Forest Research, Université du Québec à Montréal, CP 8888, Succursale Centre-ville, Montréal, QC, Canada H3C 3P8.

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Higher tree diversity in forests leads to increased tree mortality rates. This finding is crucial for understanding forest dynamics and carbon sequestration, as mortality impacts ecosystem health.

Keywords:
biodiversity and ecosystem functioningcompetitiondiversity effectstree mortalitytree survival

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Area of Science:

  • Forest Ecology
  • Ecosystem Dynamics
  • Global Change Biology

Background:

  • Tree diversity's impact on forest productivity and mitigating global change is well-studied.
  • Tree mortality's role in forest ecosystem dynamics and carbon sequestration is often overlooked.
  • Understanding tree mortality is essential for a complete picture of forest functioning.

Purpose of the Study:

  • To investigate the relationship between tree species richness and tree mortality probability.
  • To quantify the effect of tree diversity on mortality rates in temperate and boreal forests.
  • To assess the predictive importance of tree species richness for tree mortality.

Main Methods:

  • Analysis of tree mortality probabilities across varying levels of tree species richness.
  • Comparative study of mortality rates in monospecific versus diverse forest stands.
  • Statistical modeling to determine the influence of tree richness on mortality predictors.

Main Results:

  • Increasing tree species richness significantly elevates tree mortality probabilities in diverse forests.
  • Species-rich temperate forests exhibited over sevenfold higher mortality rates compared to monospecific stands.
  • Tree species richness was a key predictor of mortality in both temperate and boreal forest models.

Conclusions:

  • While promoting tree diversity offers benefits to ecosystem functioning, increased mortality must be considered.
  • Accurate prediction of forest dynamics and carbon sequestration requires accounting for diversity-driven mortality.
  • A comprehensive understanding of forest ecosystems necessitates evaluating all components, including tree mortality.