基于功能性状和系统发育的防城季节性雨林群落构建机制研究

Study on Community Assembly Mechanism of Seasonal Rainforest in Fangcheng Based on Functional Traits and Phylogeny

关键词:  植物功能性状  系统发育  群落构建  季节性雨林  零模型

Key words:  plant functional traits  phylogeny  community assembly  seasonal rainforest  null model

摘要:

为揭示环境筛选和生态位分化在群落构建和演化中的关键作用，本研究对广西防城金花茶国家级自然保护区内季节性雨林群落的植物种类、株高(H)、胸径(DBH)等功能性状及系统发育进行分析，结果表明：大石坪和那山子季节性雨林群落的净亲缘关系指数(NRI)和最近亲缘关系指数(NTI)均小于0，表明这两个群落的发育结构呈发散格局；而妹仔田季节性雨林群落的NRI和NTI均大于0，表明该群落的发育结构呈聚集格局。3个季节性雨林群落物种的株高和胸径功能性状指标的系统发育信号K值均小于1，说明物种功能性状受系统进化影响较小，物种功能性状未表现出较强的系统发育保守性。通过应用零模型分析可知，尽管不同群落类型的物种在DBH上差异不显著，但在H上部分群落间存在显著差异，暗示了不同环境和演化压力的作用。功能性状分析表明DBH和H呈现趋同进化，而群落系统发育结构分析揭示了群落内物种的亲缘关系和演化历程，表明生境过滤和种间竞争对群落构建具有显著影响。通过系统发育多样性、功能性状和系统发育信号等分析，可为揭示季节性雨林群落构建的生态过程和演化机制提供重要依据。

Abstract:

In order to reveal the key role of environmental screening and niche differentiation in community construction and evolution,the plant species,plant height (H),Diameter at Breast Height (DBH) and other functional traits and phylogeny of seasonal rainforest communities in Fangcheng Golden Camellia National Nature Reserve,Guangxi were analyzed in this study.The results showed that the Net Relatedness Index (NRI) and the Nearest Taxon Index (NTI) of Dashiping and Nashansi seasonal rainforest communities were both less than 0，indicating that the phylogenetic structure of these two communities was divergent.While the NRI and NTI of the seasonal rainforest community in Meizitian were both greater than 0,indicating that the phylogenetic structure of the community showed an aggregation pattern.The phylogenetic signal K values of two plant functional traits，H and DBH，of the three seasonal rainforest communities were all less than 1，indicating that the species functional traits were less affected by phylogenetic evolution,and the functional traits of the species did not show strong phylogenetic conservation.Through the application of null model analysis,although the species of different community types were not significantly different in DBH,there were significant differences among some communities in H,suggesting the role of different environments and evolutionary pressures.Functional trait analysis showed that DBH and H showed convergent evolution,while community phylogenetic structure analysis revealed the genetic relationship and evolution process of species in the community,indicating that habitat filtering and interspecific competition had significant effects on the community assembly.The analysis of phylogenetic diversity,functional traits and phylogenetic signals can provide an important basis for revealing the ecological process and evolution mechanism of seasonal rainforest community construction.