作用于树高生长的灰因子集随年龄增长而加强。
The Gray Factor set affecting the height growth was strengthened as the age increases.
沙地云杉为耐阴性树种，在幼年期一定程度的遮阴条件可以促进树高生长。
Spruce on sandy land is a shade-tolerant species, the height growth of its seedlings being accelerated under shady condition.
而马尾松的树高生长虽然较快，但自然整枝较差，树干不通直，且虫害较严重，抗性差；
P. massoniana showed fast height growth but poor natural trimming , crooked bole, low insect pest resistance.
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