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Title of Journal: Trees

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Springer-Verlag

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10.1007/978-1-4020-8514-7_2

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1432-2285

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Stem radius changes and their relation to stored w

Authors: Roman Zweifel Hans Item Rudolf Häsler
Publish Date: 2000/10/12
Volume: 15, Issue: 1, Pages: 50-57
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Abstract

Changes in the stem radius of young Norway spruce Picea abies L Karst were related to changes in stem water content in order to investigate the relationship between diurnal stem size fluctuations and internally stored water Experiments were performed on living trees and on cut stem segments The defoliated stem segments were dried under room conditions and weight W volume V and xylem water potential Ψ s were continuously monitored for 95 h Additionally photos of crosssections of fresh and airdried stem segments were taken For stem segments we found that the change in V was linearly correlated to the change in W as long as Ψ s was –23±03 MPa phase transition point Stem contraction occurred almost solely in the elastic tissues of the bark cambium phloem and parenchyma and the stem radius changes were closely coupled to bark water content For living trees it is therefore possible to estimate the daily contribution of bark water to transpiration from knowledge of the stem size and continuous measurements of the stem radius fluctuations When Ψ s reaches the phasetransition point water is also withdrawn from the inelastic tissue of the stem xylem which – in the experiment with stem segments – was indicated by an increasing ratio between Δ V and Δ W We assume that for Ψ s below the transition point air is sucked into the tracheids cavitation and water is also withdrawn from the xylem Due to the fact that in living P abies Ψ s rarely falls below –23±03 MPa and the xylem size is almost unaffected by radius fluctuations dendrometers are useful instruments with which to derive the diurnal changes in the bark water contents of Norway spruce trees

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