采用立木级结构代替年龄结构的方法,对浙江沿海地区(包括嵊泗县大戢山岛、定海区大猫岛、普陀区朱家尖岛、鄞州区瞻岐镇、北仑区春晓镇和宁海市力洋镇)的舟山新木姜子[Neolitsea sericea (Bl.) Koidz.]群落的物种组成和垂直结构及其种群的年龄结构、静态生命表和分布格局进行了分析。结果表明:这6 个舟山新木姜子天然群落共有维管束植物52 科76 属92 种(含6 变种),以木本植物为主,其中常绿木本植物34 种,落叶木本植物31 种。各群落的物种多样性指数差异较大,其中位于普陀区朱家尖岛的群落乔木层Shannon-Wiener 指数(H’)最高,位于定海区大猫岛的群落灌木层和草本层的H’值均最高;且存在灌木层的H’值大于乔木层和草本层的规律。种群个体年龄结构存在差异,但6 个种群均为增长型种群,幼苗储备丰富,其他龄级的个体数量总体上随径级增大而减少。6 个种群的分布格局均为显著的聚集分布,其中位于北仑区春晓镇的种群聚集强度最高,位于定海区大猫岛的种群聚集强度最低。从静态生命表看,舟山新木姜子岛屿类型种群的个体死亡率在径级I(DBH<5 cm)和径级IV(15 cm≤DBH<20 cm)较高,大陆类型种群的个体死亡率在径级玉较高。研究结果显示:浙江沿海地区舟山新木姜子群落主要为常绿阔叶林,群落间的物种多样性差异明显源于人类活动的干扰;总体上看舟山新木姜子种群具有很强的更新能力。根据研究结果,对浙江沿海地区舟山新木姜子种群的保护提出了一些建议。

Taking method of tree class structure replacing age structure, species composition and vertical structure of community, and age structure, static life table and distribution pattern of populations of Neolitsea sericea (Bl.) Koidz. in coastal areas of Zhejiang (including Dajishan Island of Shengsi County, Damao Island of Dinghai District, Zhujiajian Island of Putuo District, Zhanqi Town of Yinzhou District,Chunxiao Town of Beilun District and Liyang Town of Ninghai County) were analyzed. The results show that there are vascular plants of 92 species (including 6 varieties) in 76 genera belonging to 52 families in these six N. sericea natural communities. Woody plants are the main plants, in which there are 34 species of evergreen woody trees and 31 species of deciduous woody trees. There are great differences in species diversity indexes, in which Shannon-Wiener index (H’) of arbor layer in community located Zhujiajian Island of Putuo District is the highest, H’ values of shrub and herb layers in community located Damao Island of Dinghai District both are the highest, and H’ value of shrub layer is higher than that of arbor and herb layers. There are differences in age structure of individuals of populations, but six populations of N. sericea all are growing type, seedlings are abundant, and number of individuals in other age classes decreases with increasing of diameter class. Distribution patterns of six populations all are of Beilun District is the highest, and that of population located Damao Island of Dinghai District is the lowest. According to static life table, individual mortality rates at Idiameter class (DBH<5 cm) and IVdiameter class (15 cm≤DBH<20 cm) of island type population of N. sericea are high, and that at I diameter class of mainland type population is also high. It is suggested that N. sericea community in ncoastal areas of Zhejiang is main evergreen broad-leaved forest, the difference in species diversity among communities is obviously due to interference of human activities; on a whole, N. sericea population has a high renewal ability. Based on research result, some suggestions for protecting N. sericea population in coastal areas of Zhejiang are proposed.