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Tree stem diameter variations and transpiration in Scots pine: an analysis using a dynamic sap flow model.

M Perämäki¹, E Nikinmaa, S Sevanto

¹Department of Forest Ecology, P.O. Box 24, FIN-00014 University of Helsinki, Finland.

Tree Physiology

|August 11, 2001

Summary

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A new dynamic model simulates water flow in Scots pine trees using cohesion theory. This model links tree stem diameter changes to water tension, aiding transpiration control research.

Area of Science:

Plant Physiology
Biophysics
Forest Ecology

Background:

Understanding water transport in trees is crucial for forest health and productivity.
Transpiration drives water movement, influencing tree stem dynamics.

Purpose of the Study:

To develop and validate a dynamic model for simulating water flow in Scots pine (Pinus sylvestris L.) based on cohesion theory.
To link fluctuating water tension and wood elasticity to diurnal changes in tree stem and branch diameter.

Main Methods:

Developed a dynamic model incorporating cohesion theory and Hooke's law to relate xylem diameter changes to water tension.
Validated the model using field measurements of diurnal xylem diameter changes in a Scots pine in southern Finland.
Estimated biomechanical and hydraulic properties using simulated and measured stem diameter data.

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Main Results:

Model predictions of stem diameter at various heights closely matched field measurements over 6 days.
Estimated wood and fine root hydraulic properties were consistent with literature values (ratios 0.5-0.9).
Identified the rhizosphere as a significant site of water resistance (40% of total).

Conclusions:

The developed dynamic model provides a reliable tool for studying water flow and transpiration control in Scots pine.
Modeling water tension gradients and woody diameter changes offers insights into the relationship between hydraulic conductivity and transpiration regulation.