5-years, and DBH, height, stemvolume, wood density and bark thickness at 10.
5年生胸径、树高、材积、木材密度和树皮厚度的遗传变异进行了研究，结果表明：10。
2
Higher density stands reach quatitive maturity earlier than lower density stands, the annual stemvolume produced by unit land area of higher density stand is larger than that of lower density stands.
Method for estimating biomass and net production of forest vegetation from stemvolume of stand was proposed in this paper, and biological production all over China was estimated by using this methed.