马尾松幼树干形生长模式的研究

Study on stem form growth pattern of Pinus massoniana saplings

干形生长模式的研究对于把握树木的生态特性、估算树木生物量、构建树木形态结构模型具有重要的意义。在采用每木调查法的基础上,研究了牯牛降自然保护区马尾松幼树的树高生长、地径生长、侧枝长度与相对光照强度等指标。结果表明:当光照环境较好且初始树高较高时树高生长较快,而当处于较弱的光照强度环境,马尾松幼树相对于地径生长会优先促使树高生长,从而其干形变得更细长,依靠光照强度树木生长与干形的变化较大,且在相对光照强度达40%以上时存活率较高。因此,可推测马尾松幼树具有典型的先锋树种的特性,且光照强度在一定程度上影响其干形生长模式。

Studying on stem form growth pattern is very important for us to grasp the species ecological characteristics, estimate the biomass, and construct trees morphology model. A survey was conducted to study the tree height growth, ground diameter growth, length of lateral branch and relative light intensity of Pinus massoniana saplings in Guniujiang nature reserve of Anhui province. The results show that when the light intensity was sufficiently high, the extension growth of main stems was greater and more positively related to initial size, compared with the ground diameter, the trees had more growth allocated to the main stem under dark conditions and became less slender with the increase of light intensity, the growth allocation depended more strongly on light intensity, when the relative light intensity reached more than 40%, the trees had higher survival rate. Therefore, it can be predicable that P. massoniana saplings have the characteristics of a typical pioneer species, and the light intensity has an influence to a certain degree on stem form and growth pattern.