凹叶厚朴生长与立地因子关系研究

A Study of the Relationship Between Growth and Site Factors of Magnolia officinalis

通过对标准地的调查,运用逐步回归分析与通径相关分析方法,分别对凹叶厚朴树高、胸径、冠幅、树皮厚度、枝下高与立地因子的关系进行了分析研究。结果表明:影响凹叶厚朴树高、胸径、冠幅的主导因子是海拔和坡向,在适生区内海拔越高越不利于凹叶厚朴的生长,坡向以阳坡生长最好;坡位对凹叶厚朴胸径生长量的影响达到显著水平,下坡位有利于胸径生长量的增长,而对树高生长量的影响未达到显著水平;立地因子对凹叶厚朴树皮厚度、枝下高的影响未达到显著水平。

Through the investigation on the standard area, analysis was made of the relationship of the height, diameter at breast height（ DBH）, crown diameter, the bark thickness, under-branch height of Magnolia officinalis with its site factors by respectively using stepwise regression analysis and size correlation analysis methods. The results showed that high altitude and slopes were the dominant factors which affected height, DBH, crown diameter of Magnolia officinalis in suitable areas, higher elevations were less beneficial to its trees growing, and the trees grew best in sunny slope;the slope position in the influence of DBH of Magnolia officinalis reached significant levels, the downhill was in favour of DBH growth, but the influence of height growth was not significant; site factors in the influence on the bark thickness and un- der branch height of Magnolia officinalis had no significant difference.