武夷山典型常绿阔叶林4个主要植物种群点格局分析

Point Pattern Analysis of Four Main Plant Populations in Evergreen Broad-Leaved Forests Typical of Wuyi Mountains, Southeast China

  • 摘要: 以福建武夷山典型常绿阔叶林1.44hm2固定样地调查数据为基础,采用空间点格局分析方法中的Ripley’L函数,利用Programita软件对研究区内的植物群落以及少叶黄杞(Engelhardtia fenzelii)、米槠(Castanopsis carlesii)、南岭栲(Castanopsis fordii )和赤楠(Syzygium buxifolium)4个主要种群在不同尺度下的空间分布格局及种间关联性进行研究。结果表明:(1)所调查样地物种多样性丰富,共有139种木本植物,种群优势种不明显,少叶黄杞的重要值最高,仅为6.71%,按重要性排名前15位的木本植物植株总数所占比例为56%;(2)研究植物群落和4个主要种群分布格局基本上以集群分布为主,只有米槠种群在42~55m尺度下和赤楠种群在>47~60m的尺度下呈随机分布。整个群落的聚集强度明显小于单种的聚集强度;(3)4个主要种群种间关系以负关联为主,说明种间竞争激烈,物种更替频繁,群落组成和结构不稳定。

     

    Abstract: Based on the data collected from a 1.44 hm2 stationary sample plot of evergreen broad-leaved forest typical of the Wuyi Mountains, Southeast China, spatial distribution patterns of the plant community and the four major plant populations (Engelhardtia fenzelii, Castanopsis carlesii, Castanopsis fordii, and Syzygium buxifolium) in this study area and their interspecific relationships on different scales were studied using Ripley′L function in point pattern analysis and Programita software. Results show: (1) The sample plot is rich in species diversity, consisting of a total of 139 species of trees, among which, none is in obvious dominancy, while Engelhardia fenzelii ranks first in importance value, being 6.71%. The total number of the woody plants or trees that are listed as top 15 in importance accounts for 56% of the total of the forest. (2) The plant community and the four major plant populations are distributed mainly in cluster, except for the population of Castanopsis carlesii and the population of Syzygium buxifolium that shows certain randomicity on the scale of 42 -55 m and >47 - 60 m, respectively. The plant community was lowed lower than individual plant populations in congregation intensity. (3) Negative intra-specific relationships dominate between the four major plant populations, indicating that intense competitions between species, frequent subrogation of species and unstable composition and structure of the community.

     

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