中文摘要：

系统发育β多样性包含了物种间的系统发育信息,为群落生态学的研究提供了新的视角.系统发育β多样性与传统的物种β多样性的结合,有利于全面了解群落构建机制.本研究以古田山24hm2森林样地为研究对象,通过模型模拟不同生态学过程下的群落,分析不同尺度下物种和系统发育β多样性指数的距离衰减效应,揭示古田山样地植物群落的构建机制.结果表明：（1）古田山样地群落的物种及系统发育多样性,存在明显的距离衰减格局;（2）生境过滤和扩散限制共同作用,可以更好地解释物种β多样性维持机制;（3）系统发育β多样性维持机制运用不同指数,得到不同的结果,根据最近邻体指数（Dnn）的结果,推断生境过滤和扩散限制共同作用在维持古田山样地群落系统发育β多样性中起主要作用,根据平均成对指数（Dpw）表明,在20m×20m尺度上,生境过滤和扩散限制共同作用对群落系统发育β多样性解释得最好,但随尺度增大,即在40m×40m和50m×50m尺度上,生境过滤是解释群落系统发育结构的主要过程.系统发育β多样性与物种β多样性的格局都表明了生境过滤和扩散限制在古田山常绿阔叶林生物多样性维持中的重要作用.

英文摘要：

Phylobetadiversity can provide new insights into assembly mechanisms of community ecology because it incorporates phylogenetic information.The combination of phylobetadiversity and traditional species beta diversity is of great benefit to research that attempts to explain the mechanisms of community assemblages.To reveal the community assembly mechanisms of a 24-hm2 forest plot established in Gutianshan National Nature Reserve,Kaihua County,Zhejiang,China,our study used four spatial statistical models to simulate model communities created in four ways：purely random processes,environmental filtering,dispersal limitations and the combination of environmental filtering and dispersal limitation.Then we analyzed the distance-decay of similarity of these four model communities and observed communities based on the plot in the Gutianshan National Nature Reserve.Our results showed（1） an obvious distance-decay relationship exists for species and phylogenetic similarity in the Gutianshan plot;（2） the combined effects of environmental filtering and dispersal limitation can best explain the mechanisms involved in structuring species beta diversity in the plot;and（3） different results were produced using pairwise（Dpw） and nearest neighbor（Dnn） metrics.The results from the nearest neighbor metric（Dnn） suggested that the combined effects of environmental filtering and dispersal limitation shape the community phylogenetic structure of the plot.Additionally,the results from the pairwise metric（Dpw） showed that the combined effect of environmental filtering and dispersal limitation can best explain the community phylogenetic structure at the scales of 20 m2×20 m2,while environmental filtering is the main force shaping community phylogenetic structure at scales of 40 m2×40 m2 and 50 m2×50 m2.The combined patterns observed when considering both phylobetadiversity and traditional species beta diversity reflected the important roles of habitat filtering and dispersal limitation in diversity maintenance