浙江天童舟山新木姜子群落结构及其更新类型

Community structure and regeneration types of Neolitsea sericea in Tiantong,Zhejiang Province

舟山新木姜子Neolitsea sericea是主要分布在舟山群岛区域的珍稀树种。在进行宁波市生态公益林调查中发现天童林场有舟山新木姜子天然群落,采用标准样地法,对这一大陆种群进行群落学调查,分析了舟山新木姜子及其主要组成种群落结构。在与舟山原产地生境和个体形态比较基础上,讨论了天童林场舟山新木姜子的群落起源及其更新类型。结果表明:群落为4种共优势种群落,林木层中出现木本植物21科41种;种群结构有4种类型:逆J字型、单峰型、单柱型和L字型。逆J字型的舟山新木姜子更新个体和萌枝较多,将维持舟山新木姜子在群落中的优势地位。群落现处于灌丛阶段,与大猫种源舟山新木姜子生境较一致;叶形态与普陀种源的舟山新木姜子基本相同,因此推测该群落可能起源于普陀种源舟山新木姜子的种子漂移。

Neolitsea sericea,a rare tree species,is mainly distributed in the Zhoushan Archipelago Region.In Tiantong of Ningbo,the natural distribution of the N.sericea community （1 200 m2） was found within surveying ecological service forests.To determine the structure and quantify the N.sericea community,all woody species within 30 m×30 m quadrats were identified and measured.Then,based on size-class and frequency distribution patterns,woody plant species were categorized into regeneration types.Forty-one species of plants,belonging to 21 families,were recorded in the woody layer with four dominant species.Woody species regeneration was categorized into four types：Inverse-J,Unimodal,Unibar,and L （layering） type,with N.sericea being an Inverse-J type species.Thus,N.sericea,which regenerated through new stems and sprouts,was a long-lived,dominant woody species in the community.The habitat of this shrub community was similar to that of Damao Island,whereas its leaves were mostly like those of Putuo Island.