3种杨树木材质量的研究

Wood Quality of Three Poplars

用取自临沂市的１１年生Ｉ－６９／５５杨、Ｉ－２１４杨和１６年生毛白杨的树木，在新西兰林科院用标准试验方法进行了木材密度、心材比例、干缩率、应拉木及各项力学性能测试。对３种杨树木材的测试结果进行比较：毛白杨木材密度较高，Ｉ－６９／５５杨的木材密度与毛白杨相近，Ｉ－２１４杨的密度最低；心材含量以Ｉ－６９／５５杨最高，Ｉ－２１４杨次之，毛白杨最低；Ｉ－６９／５５杨木材干缩率较高，Ｉ－２１４杨次之，毛白杨干缩率较低，干燥时３种杨木均有皱缩，以Ｉ－６９／５５杨皱缩较重；毛白杨含中度应拉木，Ｉ－６９／５５杨含轻微应拉木，Ｉ－２１４杨不含应拉木；所测的力学性能指标以毛白杨较高，Ｉ－６９／５５杨次之，Ｉ－２１４杨最低。对小直径柱状试样进行了木材密度、心材比例及纤维长度的分析，用这种方法能方便地估测木材性质。

Wood samples of P.‘I-69/55’ and P.‘I-214’(aged 11 years)and P. tomentosa (aged 16 years) from Linyi city were tested in NZFRI with standard testing way to determine wood density,heartwood, shrinkage, tension wood and mechanical properties. The wood density of three wood samples above were compared and showed that P. tomentosa was the highest,P.‘I-69/55’was similar to P. tomentosa and P.‘I-214’was the lowest. The heartwood rate of P.I-69/55 recorded as the highest, P.‘I-214’was next to it and P. tomentosa was the lowest. P.‘I-69/55’ showed higher shrinkage rate,P.‘I-214’was next to it, P. tomentosa was lower.That three wood samples showed collapse when they were dried and P.‘I-69/55’showed severe collapse.Tension wood was regarded as moderate for P. tomentosa, slight for P.‘I-69/55’ and nil for P.‘I-214’. The mechanical properties of P. tomentosa were comparely high,P.‘I-69/55’lower and P.‘I-214’the lowest.Increment cores were used to analyse the wood density, heart wood and fiber length. The results indicated that using increment cores is an efficient method for determining a range of important wood properties.