【摘要】 根据2020年调查的尚志市林业局18块迎春5号杨树(Populus nigra×P.simonii)人工林样地的90株解析木数据，采用协方差分析、配对t检验、方差分析、多重比较等统计方法，对迎春5号杨树心材、边材、树皮的方位变异、横向变异、纵向变异、林分间变异、株间变异进行研究，并采用回归分析建立心材年轮数、心材半径、边材宽度与形成层年龄的回归模型。结果表明：迎春5号杨树心材、边材、树皮的方位变异不显著。心材半径、树皮厚度随着树干高度增加而减小，而边材宽度在树干基部较大，在树干中间大部分区域随高度变化浮动较小，在接近树梢位置的附近区域随高度增加明显减小。心材、边材、树皮的生长与去皮半径、胸径之间皆存在极显著的关系(P<0.01)。不同林分间的心边材比存在显著差异，各个林分内的心边材比也存在不同程度的株间差异。心边材年轮数随形成层年龄的增加而增加，迎春5号杨树心材形成年龄最早为2 a,且心材与边材的生长速率在12～14 a达到最高，在17 a之后趋于平缓。杨树在生长初期的生长速度过快从而提前达到成熟年龄。更多还原

【Abstract】 With the analytical data of 90 trees from 18 sample plots of Populus nigra×P. simonii plantation in Shangzhi Forestry Bureau in 2020, the statistical methods including analysis of covariance, paired t-test, analysis of variance and multiple comparison were used to studythe azimuth variation, horizontal and vertical variation, inter-stand variation and inter-plant variationof heartwood sapwood and bark of Populus nigra×P. simonii. The regression model of heartwood annual ring number, heartwood radius, sapwood width and cambium age was established by regression analysis. The orientation variation of heartwood, sapwood and bark of Populus nigra×P. simonii was no significant(P>0.05). The heartwood radius and bark thickness decreased with the increase of trunk height, while the sapwood width was larger at the base of the trunk, fluctuated less with height in most areas in the middle of the trunk, in the vicinity of the tree tip, the sapwood width decreases obviously with the increase of height. There was a very significant relationship between heartwood, sapwood and bark growth and peeling radius and DBH(P<0.01). There were significant differences in the ratio of heartwood and sapwood among different stands, and there were also differences in the ratio of heartwood to sapwood in different stands. The annual ring number of heartwood increased with the increase of cambium age. The earliest formation age of heartwood of Populus nigra×P. simonii was 2 a, and the growth rate of heartwood and sapwood reached the highest in 12 to 14 a, and tended to slow down after 17 a. The initial growth rate of poplar is too fast so as to reach the mature age ahead of time.更多还原