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Relating Stomatal Conductance to Leaf Functional Traits
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Optimal stomatal behaviour under stochastic rainfall.

Yaojie Lu1, Remko A Duursma1, Belinda E Medlyn1

  • 1Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith 2751, NSW, Australia.

Journal of Theoretical Biology
|January 23, 2016
PubMed
Summary
This summary is machine-generated.

Vegetation optimizes stomatal conductance for maximum photosynthesis under varying water availability and rainfall. This model explains gas exchange responses, crucial for understanding plant adaptation to environmental change.

Keywords:
Elevated ambient CO(2)Mean annual precipitationRainfall frequency

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Area of Science:

  • Plant physiology
  • Ecology
  • Biophysics

Background:

  • Vegetation gas exchange involves CO2 uptake and water loss, regulated by stomata.
  • Optimal stomatal behavior theory suggests maximizing photosynthesis for available water.

Purpose of the Study:

  • To optimize stomatal conductance as a function of soil water content for maximum photosynthesis rate under stochastic rainfall.
  • To derive the functional relationship between stomatal conductance and soil water content under varying environmental conditions.

Main Methods:

  • Optimization of stomatal conductance considering soil water exhaustion and surface runoff risks.
  • Modeling stomatal response under stochastic rainfall, varying rainfall frequency, precipitation, and atmospheric CO2 concentration.

Main Results:

  • An inverse S-shaped curve describes optimal stomatal conductance along the soil water gradient.
  • The model broadly captures observed responses of photosynthesis, transpiration, and water use efficiency along rainfall gradients.

Conclusions:

  • The derived theoretical framework explains vegetation gas exchange under environmental change.
  • Discrepancies suggest additional factors influence plant responses, warranting further investigation.