茂兰喀斯特森林木本被子植物谱系多样性特点及驱动因素OA

Taking woody angiosperms in the Maolan Karst Forest as the research object,this study systematically analyzed the patterns and driving factors of phylogenetic α and β diversity at the overall community level and different diameter classes by adopting linear mixed-effects models and multiple regression analysis based on the Mantel test.The results showed that:(1)Community phylogenetic α diversity(SES.MPD,phylogenetic structure)and phylogenetic β diversity(SES.be-taMPD,phylogenetic compositional difference)of communities in all plots differed from the null expectation.(2)Regard-ing different topographic habitats,the communities on hilltops exhibited a convergent structure in both phylogenetic α di-versity(phylogenetic structure value＜0)and β diversity(phylogenetic compositional difference value＜0),while both phy-logenetic α and β diversity of mid-slope communities showed no significant deviation from the null expectation.(3)Com-munity phylogenetic α diversity decreased with the increase of soil calcium mass fraction,indicating a more clustered phy-logenetic structure,community β diversity increased with the difference in topography and rock bare rate,presenting grea-ter phylogenetic compositional dissimilarity.The findings suggest that habitat filtering mediated by topographic and soil conditions may serve as a crucial ecological process driving the community assembly of Maolan Karst Forest.