摘要
文章根据荷兰64杨修枝强度试验,分析了修枝强度对生长量的影响。与不修枝的试验对照相比,修枝后的第一年和第二年各个试验处理均表现出立木材积的降低,其降低的幅度为0.35%~7.57%。在修枝后的第三年,轻度修枝和中度修枝表现出立木材积的增长,其增长幅度为4.63%~5.91%,而重度修枝表现出立木材积的下降1.99%。说明重度修枝在3a内削弱了树势,引起了材积生长量的降低。不同强度的修枝水平,影响了树干的形率和形数,表现出随着修枝强度的增大,枝下高变高,形数变大,树干的尖削度变小,通直度和圆满度提高。
According to the pruning strength test of Ntherlands 64 poplars, its influence on their growth is analyzed. Compared with the control experiment without pruning ,both the experimental treatments in the first year and second year after pruning exhibited the decrease of standing wood volume, which reduces the magnitude of 0.35% - 7.57%. In the first three years after pruning, poplars with mild and moderate pruning exhibited the growth of standing wood volume, and its growth rate is 4.63% - 5.91%, while poplars with severe pruning showed a decrease of standing wood volume by 1.99%. It is proved that severe pruning in three years weakens the tree vigor and causes a decline of volume growth. It is concluded that different pruning intensity affects the truncal form rate and form factor. With the increase of pruning intensity, the height under branch and the form factor increase, and the trunk taperingness declines with the improvement of trunk straightness and round degrees.
出处
《内蒙古林业调查设计》
2016年第1期62-63,130,共3页
Inner Mongolia Forestry Investigation and Design
关键词
荷兰64杨
修枝强度
材积生长量
Netherlands 64 poplars
pruning intensity
volume growth
