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Wood-Bark Grain Spirality Correlations in Calocedrus Formosana

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Bark grain angle at two heights was determined for 15 Taiwan incense-cedar (Calocedrus formosana) trees growing in a 31-year-old plantation in Central Taiwan. From each tree, two circular disks (5 cm and 10 cm thick) were sampled for measurement of wood grain angle. All data were subjected to standard analysis of variance. Correlations between measurements from non-destructive (bark grain angle) and destructive (wood grain angle) sampling and from 5 cm and 10 cm thick disks were computed and found to be statistically significant. A higher precision (smaller errors me an squares) for bark grain angle was obtained by averaging values from two trunk height levels rather than by using values from a single trunk height level. This study suggests that bark grain angle prediets wood grain angle in Taiwan incense-cedar and that trees with desirable wood grain angle can be selected using non-destructive measurements of bark grain angle. Average wood grain angle was approximately one-third of average bark grain angle.


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