Application of the fractometer for crushing strength: juvenile-mature wood demarcation in Taiwania (Taiwania cryptomerioids) |
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| Authors: | Chih-Ming Chiu Song-Yung Wang Cheng-Jung Lin Te-Hsin Yang Ming-Chun Jane |
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| Institution: | (1) Division of Forest Management, Taiwan Forestry Research Institute, Taipei, 100, Taiwan;(2) Department of Forestry, College of Agriculture, National Taiwan University, Taipei, 106, Taiwan;(3) Division of Forest Utilization, Taiwan Forestry Research Institute, 53 Nanhai Rd., Taipei, 100, Taiwan |
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| Abstract: | The fractometer is a device that breaks a radial increment core along the fiber for the measurement of crushing strength,
which is a direct wood quality indicator for structural lumber. In this study, the crushing strength of Taiwania (Taiwania cryptomerioides Hay) trees using the fractometer was investigated and the data were used to determine the position of demarcation between
juvenile and mature wood. Segmented regression and variance component analysis were used to estimate the demarcation position.
With increasing cambium age, the core wood improves the crushing strength in the outer wood area. Within-tree variations in
wood properties were greater than between-tree variations. In this experiment, the position of demarcation between juvenile
and mature wood occurred at an approximate distance of 10.8cm to 13.2cm from the pith at about 18–20 years of cambium age. |
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| Keywords: | Taiwania (Taiwania cryptomerioides Hay) Crushing strength Juvenile— mature wood demarcation Fractometer |
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