杉木和I-72杨人工林木材干缩性质的研究

通过对杉木和I-72杨人工林木材南北向、不同高度位置、不同径向位置横向干缩(弦、径向)的测量,研究上述3个因素对2种木材横向干缩(弦、径向)的影响规律。结果表明:南北向的不同对杉木和I-72杨人工林木材的干缩均无显著影响;高度位置的不同对杉木和I-72杨木的弦向干缩均有显著影响,而对径向干缩则无显著影响;径向位置的不同对杉木和I-72杨人工林木材的径、弦向干缩均有极显著影响:从树皮到髓心,木材径、弦向干缩逐渐减小,与其基本密度的变化趋势一致。

Studies on the Shrinkage Properties of Chinese Fir and I-72 Poplar Plantation Wood

The transverse shrinkage (tangential and radial) of Chinese Fir( Cunninghamia lanceolata )and I-72 poplar( Populus euramericana cv. `San Martina I-72/58')at different directiens (north or south), tree heights and radial directions were studied in the paper. The effect of the three factors mentioned above on the transverse shrinkage was analyzed to provide the scientific data for the appropriate processing and utilization of Chinese Fir and poplar plantation wood. The results showed that there was no significant difference of shrinkage (tangential and radial) between the samples from north and south directions for Chinese Fir and I-72 poplar. There was significant difference of tangential shrinkage at different heights for Chinese Fir and I-72 poplar, while no significant difference for radial shrinkage. For both species the shrinkage in radial and tangential direction was decreased gradually from bark to pith, with the similar trend as basic density.