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广西滨海过渡区红鳞蒲桃群落的空间结构特征

李远发,王磊,喻素芳,叶绍明,陆道调*   

  1. (广西大学林学院, 南宁 530004)
  • 出版日期:2016-03-10 发布日期:2016-03-10

Spatial structure of Syzygium hancei community along coastline of Guangxi.

LI Yuan-fa, WANG Lei, YU Su-fang, YE Shao-ming, LU Dao-diao*   

  1. (College of Forestry, Guangxi University, Nanning 530004, China)
  • Online:2016-03-10 Published:2016-03-10

摘要: 空间结构在很大程度上反映了植物个体在群落中的生态位,亦决定其拥有环境资源的额度,对维持群落的稳定性、分析种间竞争及个体存活十分重要。为探究红鳞蒲桃(Syzygium hancei -Merr. et Perry)天然群落的空间结构特征,在广西防城港滨海过渡区建立了面积为65 m×40 m的每木定位试验样地,采用结构参数二元分布分析其群落整体及不同大小树木的空间结构特征。结果表明:在受轻微干扰过的红鳞蒲桃群落中,红鳞蒲桃种群的数量和生物量均占绝对优势;无论是群落总体还是其中的大树、小树,多数个体均同时处于随机分布和低度混交状态,而属于高混交或非常规则或聚集分布的树木较少;群落中不同优势的树木拥有相似的混交状况和分布格局;多数大树同时处于优势和低度混交状态,仅有少量属于中庸或劣势木;小树几乎都属于低度混交的劣势个体,它们亦几乎同时处于随机分布和劣势状态。这些特征表明,红鳞蒲桃群落结构复杂,可能处于稳定水平。研究结果可为红鳞蒲桃群落的保护和恢复提供科学依据,也为滨海区防护林结构体系的构建提供参考。

关键词: 土壤酶, 盐碱土, 植被构建, 通径分析, 土壤微生物, 典范对应分析

Abstract: Spatial structure to a large extent discloses the habitat of individual trees in a community and the quota of environmental resources they have. It is very important for maintaining the stability of plant community, and for analyzing interspecific competition and individual survival. In this study, a plot of 65 m×40 m with every tree positioned was established in the coastal zone of Fangchenggang, Guangxi Province, with the purpose to detect the spatial characters of natural Syzygium hancei Merr. et Perry community. The whole plot and trees with different sizes were analyzed by the bivariate distribution of structural parameters. The results showed that S. hancei population had a distinct advantage in both biomass and the number of individuals when compared with other species. Simultaneously, most individuals were randomly distributed and lowly mixed, regardless of the whole community, big or small trees. Only few trees belonged to high mixture, regular or cluster distribution. For the whole plot, trees with different superiority had a similar mixture and distribution pattern. Most big trees were in a superior status and low mixture, only a few belonged to middle or inferior trees. Almost all small trees were inferior individuals with low mixture, and they were in a state of random distribution and disadvantage at the same time. These features revealed that the community had a very complex structure and may be in a stable state. Our results could be beneficial to the protection and restoration of S. hancei community, and also provide a reference for the construction of structure system of protection forest in the coastal zone.

Key words: soil microorganism, soil enzyme, saline soil, vegetation restoration, canonical correspondence analysis, path analysis