Dimensional Change with Time of Green Increment Cores Taken for Growth Stress Measurement
Keywords:
increment cores, growth stress, Eucalyptus pilularis, Pinus patulaAbstract
Cores of green wood taken from Eucalyptus pilularis and Pinus patula trees with a standard 5-mm increment borer reduce in diameter with time. This reduction occurs in both the longitudinal and tangential axes. The rate of reduction is exponential and is at a maximum immediately after sampling, cores reaching a constant diameter in about 24 to 48 hours. In some cases the reduction approaches 0.05 mm and is considered to be a significant variable where such cores are used for the Polge/Thiercelin method of growth stress analysis. As this reduction was not reproducible in cores taken from rewetted dry wood, it is considered to be due to growth stresses rather than the cutting action of the borer.References
Boyd, J., D. 1950. Tree growth stresses II. The development of shakes and other visual failures in timber. Aust. J. Appl. Sci. 1:296-312.nChafe, S. C. 1979. Growth stresses in trees. Aust. For. Res. 9:203-223.nJacobs, M. R. 1965. Stresses and strains in tree trunks as they grow in length and width. For. Timb. Bur. Comm. Aust. Leaf No. 96.nPolge, H., and F. Thiercelin. 1979. Growth stress appraisal through increment core measurements. Wood Sci. 12(2):86-92.n
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