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Daily patterns of stem size variation in irrigated and unirrigated Eucalyptus globulus


Drew, DM and O'Grady, AP and Downes, GM and Read, J and Worledge, D, Daily patterns of stem size variation in irrigated and unirrigated Eucalyptus globulus, Tree Physiology, 28, (10) pp. 1573-1581. ISSN 0829-318X (2008) [Refereed Article]

DOI: doi:10.1093/treephys/28.10.1573


High resolution measurements of stem diameter variation provide a means to study short-term dynamics of tree growth and water status. In this 14-month study, daily changes in stem radius of Eucalyptus globulus Labill. seedlings were measured with electronic point dendrometers in a plantation in southern Tasmania, Australia. The daily patterns of stem expansion and shrinkage were classified into three phases: shrinkage; recovery; and increase in diameter from one maximum to the next, or increment. This study showed that rapid onset of even mild drought in irrigated trees caused distinct changes in daily patterns of stem diameter variation, particularly the duration of daily stem increment. The duration of the daily increment phase was directly related to increment magnitude. The dynamics of daily increment were significantly affected by mean minimum temperature, indicating a temperature limitation on metabolic processes underlying diameter growth in these trees. Most likely due to differences in conductance, the duration but not rate of the incremental daily expansion was greater in fast- than in slow-growing trees.

Item Details

Item Type:Refereed Article
Keywords:dendrometer, leaf water potential, size class distributions
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:O'Grady, AP (Dr Anthony O'Grady)
ID Code:54231
Year Published:2008
Web of Science® Times Cited:42
Deposited By:Plant Science
Deposited On:2009-02-13
Last Modified:2009-05-14

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