Modeling the dynamics of pressure propagation and diameter variation in tree sapwood

A non-steady-state model of water tension propagation in tree stems was developed. The model is based on the cohesion theory and the assumption that fluctuating water tension driven by transpiration together with the elasticity of wood cause variations in the diameter of a tree stem. The change in x...

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Bibliographic Details
Published in:Tree physiology 2005-09, Vol.25 (9), p.1091-1099
Main Authors: Peramaki, M, Vesala, T, Nikinmaa, E
Format: Article
Language:English
Subjects:
diurnal variation
equations
mathematical models
Models, Biological
osmotic pressure
Pinus - anatomy & histology
Pinus - physiology
Pressure
sap flow
sapwood
stems
transpiration
trees
Trees - anatomy & histology
Trees - physiology
Water - metabolism
water uptake
Wood - anatomy & histology
Wood - physiology
xylem
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Summary:A non-steady-state model of water tension propagation in tree stems was developed. The model is based on the cohesion theory and the assumption that fluctuating water tension driven by transpiration together with the elasticity of wood cause variations in the diameter of a tree stem. The change in xylem diameter can be linked to water tension in accordance with Hooke's law. The model was tested against field measurements of the diurnal change in xylem diameter at different heights in a 180-year-old Scots pine tree at Hyytiala, southern Finland. Model predictions agreed well with measurements. The effect of tree dimensions on pressure propagation was examined with the model. The model outcomes were also consistent with results of several field measurements presented in the literature.
ISSN:0829-318X
1758-4469
DOI:10.1093/treephys/25.9.1091