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Intraspecific and intraindividual trait variability decrease with tree richness in a subtropical tree biodiversity

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Area of Science:

  • Ecology
  • Plant Biology
  • Trait Variability

Background:

  • Phenotypic variability within tree species is known to respond to local tree species richness.
  • However, the specific ways different sources of trait variation influence tree-tree interactions remain unclear.

Purpose of the Study:

  • To investigate how intraspecific and intraindividual leaf trait variability change along a tree species richness gradient.
  • To assess the contribution of these variability sources to community functional diversity and tree-tree interactions.

Main Methods:

  • Collected 4568 leaves from 381 trees across a gradient of 1 to 8 tree species.
  • Analyzed changes in intraspecific and intraindividual leaf trait variability.
  • Assessed the relationship between variability and community functional diversity.

Main Results:

  • Intraspecific trait variability in functional traits decreased with increasing tree species richness.
  • Intraindividual variability, particularly in spectral traits, showed similar trends.
  • Intraindividual variation increased functional overlap between conspecific trees, while intraspecific variation reduced it.
  • Both variability types significantly explained community functional richness and divergence, especially in species mixtures.

Conclusions:

  • Fine-scale trait variability, both intraspecific and intraindividual, plays a crucial role in shaping tree-tree interactions.
  • These variability sources are key drivers of local functional diversity in plant communities.