南亚热带常绿阔叶林优势种群的生物量与生物量增量

The Biomass and Biomass Increment of Dominant Species Ixonanthes chinensis in Lower Subtropical Evergreen Brood Leaved Forest,Guangdong

粘木种群的生物量为７０．１４ｔ／ｈｍ２，生物量增量为２．３２ｔｈｍ２ａ－１。其总生物量的９０％以上分布在ｄ≥２０ｃｍ的大树，仅有０．０４％～０．０５％分布在ｄ＜１０ｃｍ的小树。在各器官的分配是：树干为６５％，根为２５％，枝为１１％，而叶仅占有２％。粘木的平均径向增长为０．３５ｃｍ／ａ。应用树干解析法和形率法估算树干的生物量，两者的结果差别不大。但形率法则既省力省时，又较方便。粘木的形率为０．７１。

The population of Ixonanthes chinensis was a big biased structure with wore than 90% of biomass contributed by trees with d>20cm The biomass of trunk,root,branch and leaf of I chinensis was 44 5t/hm 2,17 1t/hm 2,7 3t/hm 2 and 1 3t/hm 2,respectively The annual diameter increment was 0 35 cm/a The annual biomass increment of tree parts was 1 53 trunk,0 21 branch,0 03 leaf and 0 56 root t·hm -2 ·a -1 ,respectively By comparing the two methods disc analysis and form ratio used in trunk volume estimation,the use of the form ratio to calculate the trunk volume is proved to be a useful and simple method And the form ratio of I chinensis is 0 71