一代杉木人工林(29年生)林分生物量结构

对 2 9年生的一代杉木人工林采伐时的林分生物量积累和分布进行了研究 ,结果表明 ,试验区 2 9年生杉木最大木、平均木和最小木单株各器官生物量分配比率大小顺序均为 :干 >根 >皮 >枝 >叶 ,并且干和皮器官的分配比率均较为接近 ;林分中不同径阶杉木单株各器官生物量的分配比率差异不是太大 (除了最大木的叶比率略小、枝的比率较大外 ) ,用平均木的各器官生物量来估计林分各器官生物量总量完全能满足精度要求 ;密度对林分乔木层生物量的影响较大 ;叶、干生物量及其分配比率随着密度的增大而增大 ,枝、皮生物量分配比率随密度的增大而减小 ;地被物生物量基本上是随着林分地位指数的提高、林分密度和郁闭度的降低而增加的

Research on Biomass and its Distribution of a 29-year-old,First Rotation Chinese fir Plantation

Biomass and its distribution of a 29 year old, first rotation Chinese fir plantation was studied in this paper.The results showed that proportions of biomass in different tree components were in an order of stem>root>bark>branch>leaf in sample trees of all size.Proportions of biomass in stem or bark among different sized trees were similar.There were minor difference in proportions of biomass of tree components among trees of different diameter class in the stand,except for maximum sized trees with a little higher branch,and a little lower leaf biomass proportion.Using the data of biomass of medium sized sample trees could predict the stand biomass accurately.Stand biomass was influenced significantly by stand density.Biomass and its proportion of leaf and stem increased with increasing stand density.Biomass proportion of branch and bark decreased with increasing stand density.On the whole,biomass of undergrowth vegetation increased with increasing site index,and with decreasing stand density and crown density.