Abstract
The present study clarified the relationship between the growth and wood properties of 54-year-old Agathis sp. trees planted in Indonesia. Stem diameter, pilodyn penetration, and stress-wave velocity (SWV) were measured for all trees (35 trees) in a plot (30 30 m) located almost at the center of a stand. Based on the mean stem diameter, 10 standard trees in a plot were selected for measuring the basic density (BD) and compressive strength parallel to grain (CS). Core samples (5 mm in diameter) were collected from the 10 selected trees to determine BD and CS. The mean stem diameter, pilodyn penetration and SWV in the plot were 40.2 11.3 cm, 23.4 2.1 cm, and 3.85 0.43 km/s, respectively. No significant correlation coefficeint (r = -0.327, no significance at 5% level) was obtained between stem diameter and SWV. The mean BD and CS in the 10 trees were 0.42 0.03 g/cm3 and 28.1 2.7 MPa, respectively. A significant positive correlation was observed between BD and CS. Analysis of variance (ANOVA) revealed a significant difference between BD and CS values of the 10 trees, indicating that wood properties may differ among trees with the same standard growth in a stand. From these results, we concluded that wood quality improvement in this species could be achieved by selecting trees with high density and strength in tree breeding programs.
Highlights
Agathis spp. is widely distributed throughout Indochina, Malaysia, Indonesia, and the Philippines and extended to New Guinea, New Zealand, and Fiji (Chudnoff 1980)
This study measured the stem diameter, stress-wave velocity (SWV), and pilodyn penetration of 54-year-old Agathis sp. trees planted in Indonesia
Iki et al (2009) reported a significant negative correlation between the mean basic density (BD) and pilodyn penetration value in 18 trees derived from 7 clones of 43-year-old Abies sachalinensis Masters
Summary
Agathis spp. is widely distributed throughout Indochina, Malaysia, Indonesia, and the Philippines and extended to New Guinea, New Zealand, and Fiji (Chudnoff 1980). This study measured the stem diameter, stress-wave velocity (SWV), and pilodyn penetration of 54-year-old Agathis sp. SWV and pilodyn penetration values are closely related to Young’s modulus of stem and wood density, respectively.
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