修枝对大花序桉幼林生长和木材密度的影响
Effects of Pruning on Growth and Wood Density of Young Eucalyptus cloeziana

为了解修枝对幼林大花序桉生长和木材密度的影响，该研究设置未修枝、轻度修枝、中度修枝和重度修枝4种修枝强度处理，对比分析修枝前后的生长和木材密度差异.结果表明：修枝对大花序桉幼林胸径影响的差异不具有统计学意义，而对树高影响的差异具有统计学意义，但二者共同作用下的单株材积差异不具有统计学意义，总体而言修枝对单株材积增长有降低的趋势.修枝对木材密度影响的差异不具有统计学意义，但表现为随修枝强度增加，木材密度逐渐降低.在径向位置的木材基本密度，从髓心处向外部逐渐增大，表现为修枝对后期形成的木质部密度有增加作用.
To understand the impact of pruning on the growth and wood density of young Eucalyptus cloeziana trees, four pruning intensities of CK (no pruning), light pruning, moderate pruning and heavy pruning were set in an experiment reported in this paper to compare and analyze the growth and wood density of E. cloeziana before and after the pruning treatment. The results showed that pruning intensity had no significant influence on diameter at breast height of young E. cloeziana trees, but had significant influence on their height, and individual volume, which is decided by diameter at breast height and tree height, had no significant differences between pruning intensities. Overall, pruning showed a trend of reducing individual volume growth. Pruning had some impact on wood density, which, however, was insignificant statistically, and wood density tended to decrease with increasing pruning intensity. The wood density in the radial direction from the heartwood to the sapwood increased gradually, which suggested that pruning helped to increase the density of the xylem after the treatment