针叶树种的高生长每年顶稍长出一个轮枝或一个生长节。经调查发现有的针叶树种在一年生长期内生长两个轮枝或两个生长节,故称二次高生长或叫再生长现象。在森林调查或生产中,对林龄的确定多按树木的外部形态查数轮生枝或生长节。由于针叶树有二次高生长现象的存在,因此对此类问题进行探讨。一、树木二次高生长的因素树木的高生长由主枝生长点分生组织实现,分生组织活动的强度与持久性,一般取决于树木的遗传因素、发育周期、生态环境、经营措施、水分和光照条件等。据苏联学者,将橡树培育在不同的光照条件下,有 Conifers grow high at the top of each year to grow a small branch or a growth node. The survey found that some species of conifers grow in the annual growth period of two branches or two growth nodes, so that the secondary growth or re-growth phenomenon. In the forest survey or production, the determination of the age of more trees according to the external morphology check rotation branches or growth section. Due to the existence of conifers with secondary high growth, such issues are discussed. First, the second tree growth factors Tall tree growth by the main branch of the growth of meristematic organization, meristematic activity intensity and persistence, generally depends on the genetic factors of trees, development cycle, ecological environment, management measures, Moisture and light conditions. According to Soviet scholars, the oaks were nurtured under different lighting conditions