中幼龄闽楠生长及生物量分配特征研究

Growth and Biomass Distribution of the Middle-aged and Young Phoebe bournei

对不同造林地不同林龄的闽楠生长及生物量分配特征进行研究,研究结果表明:随着树龄的增大,闽楠叶生物量显著增大,但占总生物量的比例显著下降;闽楠主干生物量占总生物量的比例随着树龄的增长而显著上升,造林26a后,树干生物量比例占62.8%;闽楠根生物量随着树龄的增大显著上升,但占总生物量的比例反而显著下降,这些数据说明闽楠生物量累积优势不断转向地上部分。闽楠在整个生长过程前8a叶、枝、根生长速度及总生物量积累速度均比8~26a快,但干的生物量积累则是在8~26a速度加快,本研究的结论表明闽楠是适合培养大径材的珍贵用材树种,其径材培育周期远超过26a,研究结果可为闽楠人工林高效培育与经营管理提供理论依据。

Growth and biomass distribution of Phoebe bournei in different ages and afforestation sites were studied.The results showed that leaf biomass of Phoebe bournei increased significantly,but.proportion of leaf biomass in the total biomass was decreased significantly with the increasing of the tree age.The proportion of stem biomass in the total biomass was increased dramatically with the increasing of the tree age,and it was accounted for 62.8% after the 26 ages.The root biomass rose significantly but the proportion of root biomass in the total biomass declined with the increasing of the tree age,and the accumulated advantage transferred to aboveground part.The rate of total biomass accumulation and growth in leaf,branch,root were higher in the first 8 years than 8~26 years,but the rate of stem biomass accumulation was increased in the 8~26 ages.In summary,Phoebe bournei was suitable for cultivating of large diameter wood,and its timber cultivation time was far more than 26 ages.The research results can provide the theoretical basis for efficient cultivation and management of Phoebe bournei plantation.