25年来广西滨海红鳞蒲桃群落的变化特征

Variation Characteristics of Syzygium hancei Communities along the Coast of Guangxi during the Past 25 Years

关键词:  红鳞蒲桃  群落变化  异质性

Key words:  Syzygium hancei  community variation  heterogeneity

摘要:

[目的]研究广西滨海红鳞蒲桃群落1986年和2012年两个时期的群落变化特征,为其保护、恢复和重建提供群落学基础。[方法]运用α多样性指数和β多样性指数对比分析1986年和2012年两个时间梯度红鳞蒲桃群落物种组成和物种多样性的变化特点,初步掌握其群落变化特征。[结果]相对于25年前,红鳞蒲桃群落的优势种红鳞蒲桃的地位更加明显,由于边缘效应,群落物种丰富度总体上升。两个时间梯度的群落存在物种组成结构异质性,灌木层消失和增加的种类都较多,其异质性主要表现在灌木层上,其次为乔木层。[结论]25年间,广西滨海的红鳞蒲桃群落存在物种组成结构异质性,物种的替代和更迭无一定规律,但群落物种组成未发生质的变化,群落整体空间格局相对完好,仍保持地带性植物群落的结构和功能特征,可为改造和建立广西海岸带防护林及其地带性植被提供群落学基础。

Abstract:

[Objective] The variation of Syzygium hancei community along the coast of Guangxi in 1986 and 2012 was studied to provide a community basis for protection, restoration and reconstruction.[Methods] The species composition and species diversity of Syzygium hancei community in 1986 and 2012 was analyzed by using alpha diversity index and beta diversity index, so as to master its initial community variation characteristics.[Results] Compared with 25 years ago,the dominant species, especially Syzygium hancei, were more pronounced, and the richness of the community increased as a result of the edge effect.There was heterogeneity of species composition structure in the two time gradient communities.The species of shrub layer changes were obvious, and it was the main factor of the formation of heterogeneity, followed by the tree layer.[Conclusion] During the past 25 years, there was heterogeneity in Syzygium hancei community, the replacement and change of species were not regular, but there was no qualitative change in species composition.The spatial pattern of communities was intact relatively, and it still kept the characteristics for the structure and function of zonal forest.It would provide a community basis for the transformation and establishment of the protective coast-forest and zonal vegetation along Guangxi coast.