Simple equations to estimate light interception by isolated trees from canopy structure features: assessment with...

Area of Science:

• Plant physiology
• Forestry science
• Ecological modeling

Background:

• Accurate modeling of light interception is vital for understanding plant productivity and canopy dynamics.
• Simple models can identify key structural parameters influencing light capture in trees.

Purpose of the Study:

• To develop and test simple models for light interception in isolated trees.
• To relate tree crown structure to light interception properties using virtual experiments.

Main Methods:

• Developed simple models decomposing light interception into crown envelope projection and crown porosity.
• Utilized 3-D digitized apple trees from Lebanon and Switzerland for virtual experiments.
• Computed canopy structure and light interception variables from digitized tree data.

Main Results:

• Established power function relationships between projected envelope area and crown volume (exponent 2/3).
• Found crown porosity to be a negative exponential function of mean optical density.
• Demonstrated a negative linear relationship between leaf dispersion and the variance of leaf area density.

Conclusions:

• The developed models, expressed as two single equations, accurately predict light interception based on tree structure.
• Model outputs closely matched values derived from 3-D digitized tree databases after calibration.
• These findings offer a simplified yet effective approach to assessing light capture in tree canopies.