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(二)物理性质 1.密度木材密度因树种不同其差别很大。国产蚬木Burretiodendron hsienmu Chun etHow(气干密度1.13克/厘米~3,下同)~([5])比引种国外的轻木Ochroma lagopus Sw.(0.24)相差近5倍。泡桐属的树种全是国产最轻的木材树种(0.26～0.33)(表7)。密度通常是表明木材物理和强度性质的可靠指标,研究泡桐树种的木材密度,即可对泡桐材的物理和强度性质作出适当评价。
(B) of the physical properties 1. Density of wood density varies widely by tree species. Domestic alder Burretiodendron hsienmu Chun et How (air dry density of 1.13 g / cm ~ 3, the same below) ~ ([5]) than the introduction of foreign light wood Ochroma lagopus Sw. (0.24) a difference of nearly 5 times. The species of Paulownia are all the lightest domestic wood species (0.26 ~ 0.33) (Table 7). Density is usually a reliable indicator of the physical and strength properties of wood. The study of the density of wood in paulownia trees provides an appropriate assessment of the physical and strength properties of the paulownia wood.