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Relationship between Growth and Wood properties in Agathis sp. Planted in Indonesia Futoshi Ishiguri; Kazuko Makino; Imam Wahyudi; Jun Tanabe; Yuya Takashima; Kazuya Iizuka; Shinso Yokota; Nobuo Yoshizawa
Wood Research Journal Vol 3, No 1 (2012): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2012.3.1.1-5

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.

Radial Variation of Wood Property in Agathis sp. and Pinus insularis Growing at Plantation in Indonesia Futoshi Ishiguri; Imam Wahyudi; Kazuya Iizuka; Shinso Yokota; Nobuo Yoshizawa
Wood Research Journal Vol 1, No 1 (2010): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2010.1.1.1-6

To obtain basic knowledge of wood properties in plantation coniferous species growing in tropical countries, the radial variation of wood properties, such as the basic density (BD) and microfibril angle of the S2 layer in tracheid (MFA), and the compressive properties were investigated in 45-year-old Agathis sp. and 32-year-old Pinus insularis growing in Indonesia. In Agathis sp., the BD showed an almost constant value from the pith to the bark. In P. insularis, the BD of heartwood clearly decreased by the extraction with organic solvent. As a result, the BD extracted with organic solvent showed a constant value up to 5 cm from the pith and then gradually increased toward the bark. In the radial variation of the MFA, the highest value was observed near the pith in both species. In the compressive property parallel to the grain, the modulus of elasticity (E) and compressive strength (s) showed an almost constant value from the pith to the bark in Agathis sp., whereas, in P. insularis, both E and s increased from the pith to the bark. In both species, the E was affected by the MFA. In addition, in Agathis sp., s was affected by the BD, while in P. insularis, it was affected by the BD extracted with organic solvent and the MFA.

Relationship between Growth and Wood properties in Agathis sp. Planted in Indonesia Futoshi Ishiguri; Kazuko Makino; Imam Wahyudi; Jun Tanabe; Yuya Takashima; Kazuya Iizuka; Shinso Yokota; Nobuo Yoshizawa
Wood Research Journal Vol 3, No 1 (2012): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2012.3.1.1-5

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.

Radial Variation of Wood Property in Agathis sp. and Pinus insularis Growing at Plantation in Indonesia Futoshi Ishiguri; Imam Wahyudi; Kazuya Iizuka; Shinso Yokota; Nobuo Yoshizawa
Wood Research Journal Vol 1, No 1 (2010): Wood Research Journal
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51850/wrj.2010.1.1.1-6

To obtain basic knowledge of wood properties in plantation coniferous species growing in tropical countries, the radial variation of wood properties, such as the basic density (BD) and microfibril angle of the S2 layer in tracheid (MFA), and the compressive properties were investigated in 45-year-old Agathis sp. and 32-year-old Pinus insularis growing in Indonesia. In Agathis sp., the BD showed an almost constant value from the pith to the bark. In P. insularis, the BD of heartwood clearly decreased by the extraction with organic solvent. As a result, the BD extracted with organic solvent showed a constant value up to 5 cm from the pith and then gradually increased toward the bark. In the radial variation of the MFA, the highest value was observed near the pith in both species. In the compressive property parallel to the grain, the modulus of elasticity (E) and compressive strength (s) showed an almost constant value from the pith to the bark in Agathis sp., whereas, in P. insularis, both E and s increased from the pith to the bark. In both species, the E was affected by the MFA. In addition, in Agathis sp., s was affected by the BD, while in P. insularis, it was affected by the BD extracted with organic solvent and the MFA.

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