A process-based model of climate-driven xylogenesis and tree-ring formation in broad-leaved trees (BTR)

Area of Science:

• Plant Biology
• Forest Ecology
• Dendrochronology

Background:

• Process-based xylem formation models are crucial for understanding tree radial growth.
• Existing models primarily focus on conifers, leaving a gap for broad-leaved species.
• Accurate modeling of broad-leaved tree growth is essential for ecological studies.

Purpose of the Study:

• To develop a process-based model for xylem formation and ring growth in broad-leaved trees.
• To simulate the influence of climate factors on cell production and enlargement.
• To provide a tool for analyzing inter-annual and intra-annual ring width variations.

Main Methods:

• Developed the Broad-leaved Tree-Ring (BTR) model.
• Incorporated climate variables: daylength, air temperature, soil moisture, and vapor pressure deficit.
• Modeled daily xylem cell production (fibers, vessels) and growth (enlargement, wall deposition).

Main Results:

• The BTR model successfully simulated inter-annual ring width variations.
• The model accurately captured intra-annual changes in vessel and fiber cell formation.
• Simulations were validated for Fraxinus mandshurica (ring-porous) and Betula platyphylla (diffuse-porous).

Conclusions:

• The BTR model is a viable tool for simulating xylem formation in broad-leaved trees.
• The model enhances understanding of how climate influences wood formation processes.
• This research provides a foundation for studying climate change impacts on broad-leaved forest ecosystems.