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Relating Stomatal Conductance to Leaf Functional Traits
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Changes in leaf functional traits with leaf age: when do leaves decrease their photosynthetic capacity in Amazonian

Juliane Menezes1, Sabrina Garcia2, Adriana Grandis3

  • 1Tropical Forest Sciences Graduate Program, National Institute of Amazonian Research (INPA), Manaus, Amazonas, Brazil.

Tree Physiology
|April 28, 2021
PubMed
Summary
This summary is machine-generated.

Leaf age significantly impacts photosynthetic capacity in Amazonian trees, with maximum rates occurring around 45 days. Species-specific strategies and nutrient levels also influence seasonal productivity.

Keywords:
V cmaxAmazon forestleaf demographyleaf nutrientsleaf ontogenyphenological typestomatal controltropical trees

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Area of Science:

  • Ecology
  • Plant Physiology
  • Forest Science

Background:

  • Leaf functional traits are crucial for ecosystem productivity.
  • Ontogenetic variations (leaf age) are often overlooked in Amazonian studies.
  • Previous age classifications were typically qualitative and discontinuous.

Purpose of the Study:

  • To quantify age-dependent changes in leaf functional traits for Amazonian tropical trees.
  • To investigate the relationship between leaf age and photosynthetic capacity (Vcmax).
  • To compare continuous leaf age assessment with discontinuous age categories.

Main Methods:

  • Monthly censuses of branch-level leaf demography to assess leaf age.
  • Leaf trait measurements (Vcmax, stomatal control, dry mass per area, macronutrients) based on chronological leaf age.
  • Analysis of nine naturally growing Amazon tropical trees with diverse phenological strategies.

Main Results:

  • A nonlinear relationship between Vcmax and leaf age was observed, peaking at approximately 45 days.
  • Leaf maturation times varied substantially among species (8-238 days).
  • Stomatal control increased in young leaves and then stabilized; phosphorus and potassium decreased with age, while nitrogen remained constant.

Conclusions:

  • Leaf age influences photosynthetic capacity, but species life strategies and nutrient concentrations are also key drivers of seasonal photosynthesis.
  • Continuous assessment of leaf age is more informative than discontinuous categories for Amazonian tree communities.
  • The Vcmax-leaf age relationship may not hold true for all Amazonian trees.