Studies of the Volumetric Response of Snow Gum Bark to Freezing
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.
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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: 1977-09-01
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