尾叶桉人工林种群密度的研究

Population density of Eucalyptus urophylla plantation.

探讨了5.6年生尾叶桉种群密度与冠幅、胸径、树高、立木单株材积、林分蓄积量、木材性质及保存率等的作用规律和相关模型.结果表明,密度对胸径、立木单株材积、冠幅及枝下高的影响达到极显著水平;对蓄积量、木材纤维宽度的影响达显著水平;对树高、木材气干密度和木材纤维长度虽有一定的影响,但不显著.其中,密度与蓄积量、枝下高、木材纤维宽度呈正相关关系;而与胸径、立木单株材积、冠幅呈负相关关系.此外,尾叶桉具有较宽的合理密度范围;作为短周期浆纸林,其最佳密度应确定为2000株·hm-2.

This paper dealt with the relationships and correlation models of the population density of 5.6 years old Eucalyptus urophylla plantation with its crown width,diamter at breast height(DBH),tree height,individual standing volume,stand volume,wood properties and survital rate.The results showed that the population density remarkably affected DBH,individual standing volume,crown width,live branch height,stand volume and wood fiber width;but not affect tree height,basic density of wood,and length of wood fibers.It had a positive relationship with stand volume,live branch height and wood fibers width,and a negative relationship with DBH,individual standing volume and crown width.In addition, E.urophylla had a wide range of reasonable density.For short rotation puplwoods,the optimum planting density of E.urophylla is 2000 individuals per hectare.