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基于大岗山林区相似立地条件前后3次生物量调查研究资料,结合杉木人工林固定样地长期观测材料对杉木人工林生物量的变化规律作了较为详尽的研究,得到了如下主要研究结果:(1)对于同一林分,除叶生物量和某些枝生物量存在一个减小的时期外(5a至8a时),单株和林分各组分生物量均随林龄的增加而增大。在12a前的林分速生期间,叶、枝、干所占比重微弱增加,致使地上部分比重增加,而根比重减小;在干材期(12～16a),单株各组分所占比例趋于稳定。(2)立地指数对单株和林分各组分的生物量、总生物量以及生物量分配比率均存在显著影响,且这种影响随着林龄的变化而变化,并受初植密度的制约。(3)随着初植密度的增大,单株各组分生物量明显减小,干生物量分配比率在任一林龄时刻均呈下降趋势;由密度所形成的不同林分生物量间的差距随林龄呈减弱的趋势。
Based on the data of 3 times of biomass survey before and after the similar site conditions in Dagangshan forest area and the long-term observation data of Cunninghamia lanceolata plantations, the changes of biomass of Cunninghamia lanceolata plantation were studied in detail. The main results are as follows: (1) For the same stand, the biomass of individual plantations and stand components increased with stand age except leaf biomass and some of the branches had a decreasing period (from 5a to 8a) Big. During the fast growing period before 12 d, the proportion of leaves, branches and stems increased slightly, which led to the increase of the proportion of aerial parts and the decrease of the proportion of roots. During the dry period (12 ~ 16a) becoming steady. (2) The site index had a significant effect on the biomass, total biomass and biomass allocation ratio of each component of the plant and stand, and this effect varied with stand age, Restrictions. (3) With the increase of planting density, the biomass of each component decreased obviously, and the ratio of dry biomass decreased at any stand age. The biomass of different stands formed by density The gap with the age was weakened trend.