马尾松人工林木材主要材性家系间的变异

对25个家系马尾松人工林木材主要物理力学性能进行测定和比较分析。结果表明，马尾松人工林木材气干密度由大到小居前五位的家系依次为378、329、317、341、335，顺纹抗压强度值由大到小居前5位的家系依次是335、350、372、325、329；家系341和350马尾松人工林木材体积干缩系数和差异干缩均较小，尺寸性稳定均较好。方差分析表明，家系对马尾松人工林木材主要物理力学性能影响显著。多重比较分析表明，马尾松人工林木材气干密度、体积干缩系数、差异干缩以及顺纹抗压强度各家系间大都表现为差异显著或极显著。家系335、341、350、378可作为马尾松人工林木材品质选育的优良材料。

Variation of Main Properties for Pinus massoniana Plantation Wood from Different Families

Main physical and mechanical properties of Pinus massoniana plantation wood from 25 families were determined and analyzed comparatively.The results showed that the family named 378, 329, 317, 341 and 335 presented the top five air-dried density from high to low, as for the compression strength parallel to the grain, the order was 335, 350,372, 325, and 329. The volume shrinkage coefficient and shrinkage were low in family 341 and 350，indicating their high dimensional stability. Variance analysis showed that differences in main physical and mechanical properties among families were significant. LSD analysis illustrated that there was extremely significant difference or significant difference in air-dried density, volume shrinkage coefficient，ratio of tangential shrinkage to radial shrinkage and compression strength parallel to the grain among most families. Families named 335,341,350,378 could be used as good material of quality breeding for P. massoniana wood from plantation.