闽楠天然林与人工林生长特性研究

通过江西吉安闽楠天然林和人工林的群落调查及树干解析分析,结果表明,闽楠天然林和人工林树高、胸径及单株材积等生长特性基本相似.其生长过程大致可分为3个时期,1～10 a为树高、胸径及单株材积生长的缓慢期;10～20 a为树高生长速生期,此时闽楠林树高连年生长量达0.60 m以上;10～30 a胸径生长急剧上升,期间胸径连年生长量达到0.86 cm以上;15～25 a时材积生长逐渐加速;20 a后为树高生长匀速期,连年生长量平均为0.33 m;30 a后胸径生长速度变慢,连年生长量平均为0.44 cm,33 a时达到数量成熟,并且随着树龄的增大,树形不断向圆锥体靠近;25 a后材积生长迅速提高,平均生长量达0.013 63 m~3,说明闽楠生长速度并不缓慢,是培育珍贵阔叶树种大径材优良树种之一.

A Study on the Growth Characteristics of Phoebe bournei in Natural Forest and Plantation Stands

The natural forest and plantation community investigation and stem analysis were conducted in order to study the stem growing process of Phoebe bournei in Ji'an,Jiangxi Province.The results indicated that:the growth characteristics of tree height and breast height diameter(DBH)and volume of P.bournei in natural forest were similar to those in plantation tree and the growth process could be divided into 3 stages.1～10 a was the slow growth stage of tree height and DBH and individual tree volume.10～20 a was the fast growth stage of tree height,in which the current annual increment was over 0.60 m and 10～30 a was the fast growth stage of DBH,in which the current annual increment was over 0.86 cm and 15～25 a was the increasing stage of individual tree volume.20 a later was the uniform growth stage of tree height,in which the current annual inerement was over 0.33 m.30 a later DBH growth was slow.in this stage the current annual increment was over 0.44 cm.And 33 a was its quantitative maturity period.and along with tree age increasing,the shape of tree unceasingly approached to the cone and the individual tree volume increased rapidly 25 a later,the an-nual growth increment of individual tree volume was over 0.013 63 m~3.It may be concluded that.P.bournei growth is not slow.It is one of the fine trees of large diameter wood of precious broad-lcaved trees.