2种杉木人工林密度与立木生物量的研究

The relationship between stand density and biomass of two rotation Chinese fir plantations

以福建省福州白沙国有林场和南屿国有林场杉木人工林为研究对象,在立地条件相似、林分密度分别为1 300-1 500和2 200-2 400株.hm-2的杉木人工林中设置样地,选取样木进行分层取样测定不同器官生物量,分析林分密度与生物量的关系。结果表明,林分总生物量随密度的增大而增大,高密度林分总的生物量为251.33 t.hm-2,高于低密度林分的生物量,其中树干的生物量最大,为154.46 t.hm-2,占总量的61.87%,超过低密度林分的26%;其次是根的生物量,为57.52t.hm-2,占总量的22.85%,超过低密度林分的22%;枝的生物量最低,为19.80 t.hm-2,仅占总量的7.62%;而叶的生物量最低,为19.55 t.hm-2,仅占总量的7.66%,高于低密度林分的38%,林分各组分生物量的大小顺序为干>根>枝>叶。

Selecting sampling tree and taking samples from different layer of the sample plots,set on the basis of similar site condition in Chinese fir forest with stand density numbering from 1 300 to 1 500 plants · hm-2 and from 2 200 to 2 400 plants · hm-2,located in State-owned forest farms of Baisha and Nanyu of Fuzhou City in Fujian Province,the article analyzes the relationship between stand density and biomass of the Chinese fir plantation.The result indicates that the gross stand biomass increase with the growth of density;the gross stand biomass of high density,at 251.33 t · hm-2,is higher than that of lower density.The biomass of the stem,taking up the 61.87% of the total,is 154.46 t · hm-2 and outnumbers the stand of lower density by 26%;and the biomass of the root,taking up the 22.85% of the all,is 57.52 t · hm-2 and outnumbers the stand of lower density by 22%;and occupying the 7.66% of the all,the biomass of the leaf is only 19.55 t · hm-2 and outnumbers the stand of lower density by 38%.The biomass order of different organs is WtWrWbWl.