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Protocols in ecological and environmental plant physiology


Article << Previous     |     Next >>   Contents Vol 41(5)

Xylem as the main origin of stem radius changes in Eucalyptus

Roman Zweifel A B D, David M. Drew B, Fritz Schweingruber A and Geoffrey M. Downes B C

A Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, CH-8903 Birmensdorf, Switzerland.
B CSIRO Ecosystem Sciences, Private Bag 12, Hobart, Tas. 7001, Australia.
C Forest Quality Pty Ltd PO Box 293 Huonville, Tas. 7109, Australia.
D Corresponding author. Email: roman.zweifel@natkon.ch

Functional Plant Biology 41(5) 520-534 http://dx.doi.org/10.1071/FP13240
Submitted: 8 August 2013  Accepted: 8 December 2013   Published: 13 January 2014

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The state-of-the-art interpretation of stem radius changes (DRTotal) for tree water relations is based on knowledge from mostly slow growing tree species. The ratio between diurnal size fluctuations of the rigid xylem (DRXylem) and the respective fluctuations of the elastic bark (DRBark) is known to be small (<0.4) and is of importance for the localisation of water storage dynamics in stems. In this study, fast growing Eucalyptus globulus Labill. in Tasmania were investigated by point dendrometers in order to investigate tree water relations. Unexpectedly, DRXylem was found to be the main driver of DRTotal with the bark acting as a passive layer on top of the fluctuating xylem under most conditions. Accordingly, the ratio between the diurnal fluctuations of the two tissues was found to be much higher (0.6–1.6) than everything reported before. Based on simulations using a hydraulic plant model, the high tissue-specific elasticity of the Eucalyptus xylem was found to explain this atypical response and not osmotically-driven processes or species-specific flow resistances. The wide zone of secondary thickening xylem in various stages of lignification is proposed to be an important component of the high wood elasticity. The tissue acts as additional water storage like the bark and may positively affect the water transport efficiency.

Additional keywords: bark, cambial activity, Eucalyptus globulus, Larix decidua, lignification, phloem, point dendrometer, stem size fluctuations, Tasmania, hydraulic plant model, tree rings, tree water relations, water tension, wood growth.


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