Study on Community Assembly Mechanism of Seasonal Rainfor-est in Fangcheng Based on Functional Traits and Phylogeny
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,indica-ting 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 environ-ments and evolutionary pressures.Functional trait analysis showed that DBH and H showed convergent evo-lution,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 signifi-cant effects on the community assembly.The analysis of phylogenetic diversity,functional traits and phyloge-netic signals can provide an important basis for revealing the ecological process and evolution mechanism of seasonal rainforest community construction.
plant functional traitsphylogenycommunity assemblyseasonal rainforestnull model
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