沙地樟子松人工林林木胸径、冠幅等生长指标与林龄相关性研究

摘要

通过对章古台地区的10~60 a林龄樟子松人工林的样地进行树龄、胸径、冠幅、枝下高等指标调查、观测,并使用SPSS进行分析.结果显示:沙地樟子松人工林的胸径生长量、枝下高高度与林龄有极显著相关性;冠幅大小与林龄有显著相关性;各生长量两两之间有极显著相关关系,且随树龄的增加而增长,立地条件的差异可能会延长或缩短这种进程,但不会改变这种趋势.胸径生长量、冠幅大小、枝下高高度随林龄变化的模型分别为y=e0.75+3.212/x、y=-0.085+0.344 x-0.008 x2、y=e2.942-57.681/x ;冠幅和胸径比随林龄变化的模型为y=0.38273rne-0.01255x 。该研究揭示了沙地樟子松人工林胸径及冠幅等指标的生长随林龄变化的规律.%The stand age,DBH,crown diameter & branch height of 10-60-year-old Pinus sylvestris var.mongolica plantation were investigated,observed and measured with SPSS in Horqin sandy land.Result shows that DBH growth and height of branches under Pinus sylvestris var.mongolica plantation have a significant correlation with stand age.The crown width have significant correlation with stand age,and there is a significant correlation between growth increment,And the increase with age,site conditions,differences may extend or shorten the process,but will not change this trend.The model of DBH,crown size & branch height under different stand age is;y=e0.75 + 3.212 / x,y =-0.085 + 0.344x-0.008 x2,y =e2.942-57.681 / x,respectively.;the model of ratio of crown width and diameter under different stand age is y =0.382 73 e-0.012 55 x.It revealed the law of growth of indices (DBH and crown width) changed with the stand age.