Studies of the Volumetric Response of Snow Gum Bark to Freezing

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Changes in volume of fresh bark samples of snow gum were measured in an improvised dilatometer as they were cooled from 20° down to -10°C and then warmed again to room temperature. Rapid shrinkage was coincident with ice formation in the tissue and continued with cooling to approximately -8°C. The amount of shrinkage was closely related to volume of intercellular spaces. On warming from -10°C to 0°C, the pattern of recovery in tissue dimensions was essentially the reverse of shrinkage and was completed at 0°C. The results in all respects are consistent with the explanation of extracellular freezing in plant tissue and show conclusively that changes in dimensions of tree boles under freeze-thaw conditions are the product of that process in live bark and similar tissue. FOREST SCI. 23:337-342.

Keywords: Eucalyptus pauciflora; bark shrinkage; dendrometric measurements; extracellular freezing; freezing effects; recovery

Document Type: Journal Article

Affiliations: Division of Plant Industry, Commonwealth Scientific and Industrial Research Organization, P.O. Box 1600, Canberra City, A.C.T. 2601, Australia

Publication date: September 1, 1977

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