Measuring the Canopy Architecture of Young Vegetation Using the Fastrak Polhemus 3D Digitizer

Area of Science:

• Forestry Science
• Ecology
• Biomass Allocation

Background:

• Climate change necessitates adapting forest management practices.
• Understanding forest biomass allocation is crucial, influenced by crown architecture.
• Scots pine, a widespread European species, is highly vulnerable to climate change.

Purpose of the Study:

• To demonstrate the capability of the Fastrak Polhemus magnetic digitizer for 3D canopy architecture mensuration.
• To assess structural information relevant to forest management and climate change adaptation.
• To analyze the influence of stand density on young Scots pine tree architecture.

Main Methods:

• Utilized the Fastrak Polhemus magnetic digitizer to create 3D models of individual young Scots pine trees.
• Performed statistical analysis on the obtained 3D structural data.
• Evaluated the relationship between stand density, branch structure, and tree height.

Main Results:

• Stand density significantly affects branch order number and tree height in naturally regenerating Scots pine.
• Clear-cut areas (density 0.0) showed the highest number of branch orders, while mature stands (density 0.8) had the lowest.
• A negative correlation was observed between tree branching intensity and tree height; increased branching led to reduced height growth.

Conclusions:

• The Fastrak Polhemus digitizer provides valuable data for structural-functional forest models.
• Findings offer insights for predicting future tree growth and carbon fixation under changing climate conditions.
• Magnetic digitizers, despite occlusion limitations, offer a viable method for detailed tree architecture assessment.