不同年龄47号杨木材性质变异研究

1998年在辽宁省建平县对47号杨的2、4、5、6、7、9、12a基本材性进行了分析研究，结果表明：不同年龄间的基本密度、纤维长度、1％NaOH抽提物和壁腔比差异极显著；树干上、中和下3个取材部位间的基本密度和壁腔比差异极显著；基本材性的年龄X取材部位交互效应微弱或不存在。木材材性性状随着年龄变化存在一定的变异规律，随树高变异规律性不明显。材性和生长早晚相关分析表明：第2年与第12年木材密度、与第5年纤维长度、与第7年胸径之间相关极显著，与第12年木材壁腔比和1％NaOH抽提物之间相关显著；第5年与第9年木材基本密度和树高、与第7年1％NaOH抽提物之间相关显著或极显著；第4年与第12年胸径间相关显著，表明可以在第2年、第4年和第5年分别对第9年或12年的相关性状进行早期选择。

Variation of Wood Qualities along Tree Height and Growth and Correlation Analysis of Multiple-traits in Poplar Hybrid

Three clones of 2-,4-,5-,6-,7-,9-and 12-year-old of Populus × euramericana cv.'N2136'were randomly selected from plantations grown at the spacing of 3 m×4 m from Jianping County in Liaoning Province.For each clone,5 cm disks were taken from 40 cm,1/2 and 2/3 heights for measurement and analysis for basic density,fiber length,and ratio of wideness to space and 1% NaOH extractant of wood.Their heights,DBHs and diameters on 1/3 and 2/3 whole height were also measured and analyzed.The results showed that there existed significant difference of four wood qualities among clones of different ages.It also proved that the interaction between age and height of wood qualities did not exist or was not significant.Although no uniform trend in the changes of all wood qualities at different heights were observed,it was found that all qualities showed increasing or decreasing trends with ages and no clear pattern was indicated.Relationship between the early and the late for wood and growth of was analyzed,which showed relative coefficients between the early and the late were significant.According to the relative coefficients,early selection could be undertaken for wood qualities and growth in late age.It also suggested that early and late utilization of wood should be carried out during 4^th-and 12^th-year.