Official Journal of the Japan Wood Research Society
Table 1 Density, porosity, moisture content, growth ring and heartwood proportion measured and computed for the samples of the different blocks of wood in air-dry conditions (mean ± SE)
Species | Direction | MC (%) | Density (kg/m3) | Porosity (r) | Growth ring (#) | Ring angle (°) | Heartwood/sapwood ratio (%) |
|---|---|---|---|---|---|---|---|
Japanese cedar | Radial | 21.7 ± 1.8 | 381 ± 9 | 0.746 ± 0.006 | 21.7 ± 1.8 | 22.4 ± 1.8 | ≥75 |
Tangential | 18.8 ± 1.6 | 358 ± 8 | 0.761 ± 0.006 | 18.8 ± 1.6 | 23.0 ± 2.3 | ≥75 | |
Japanese cypress | Radial | 14.8 ± 1.4 | 480 ± 15 | 0.680 ± 0.020 | 14.8 ± 1.4 | 61.8 ± 3.7 | ≥50 |
Tangential | 16.3 ± 0.7 | 474 ± 7 | 0.684 ± 0.005 | 16.3 ± 0.7 | 61.0 ± 3.6 | ≥50 | |
Sitka spruce | Radial | 16.8 ± 0.6 | 438 ± 9 | 0.708 ± 0.006 | 16.8 ± 0.6 | 62.2 ± 4.8 | ≥50 |
Tangential | 17.9 ± 0.4 | 439 ± 4 | 0.707 ± 0.003 | 17.9 ± 0.4 | 59.0 ± 3.1 | ≥50 | |
Douglas fir | Radial | 14.8 ± 1.4 | 564 ± 26 | 0.624 ± 0.017 | 14.8 ± 1.4 | 30.8 ± 1.5 | 100 |
Tangential | 16.3 ± 0.6 | 645 ± 9 | 0.570 ± 0.006 | 16.3 ± 0.6 | 29.0 ± 2.9 | 100 |