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Trait-Based Community Assembly along an Elevational Gradient in Subalpine Forests: Quantifying the Roles of

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Intraspecific trait variation is crucial for understanding plant community assembly and responses to environmental change, particularly along elevational gradients. This study highlights its significant role alongside species turnover in shaping forest ecosystems.

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Area of Science:

  • Community Ecology
  • Plant Functional Traits
  • Ecosystem Dynamics

Background:

  • Plant communities adapt to environmental gradients through variations in functional traits.
  • The relative importance of intraspecific versus interspecific trait variation remains under-explored.

Purpose of the Study:

  • To investigate the contributions of intraspecific and interspecific trait variability to community assembly across an elevational gradient.
  • To determine how different components of trait variation respond to climatic and soil variables.

Main Methods:

  • Measured six functional traits for 55 tree species across a 1200 m elevational gradient in Southwest China.
  • Analyzed trait variability using community-weighted means and functional diversity.
  • Correlated trait variation components with environmental factors (climate and soil).

Main Results:

  • Species turnover dominated variation in leaf morphology (thickness, SLA).
  • Intraspecific variation explained substantial variation in height, leaf nitrogen, and leaf phosphorus (49.3%-76.3%).
  • Accounting for both intraspecific and interspecific variation improved detection of limiting similarity in community assembly.

Conclusions:

  • Intraspecific trait variation is a critical driver of plant community assembly.
  • Understanding intraspecific variation is essential for predicting community responses to environmental change.
  • Trait variation components respond distinctly to different environmental axes, notably soil moisture and climate.