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\title{Identifying the patterns of changes in \selectlanguage{greek}α \selectlanguage{english}and \selectlanguage{greek}β \selectlanguage{english}diversity across
Dacrydium pectinatum communities in Hainan Island, China\selectlanguage{english}}



\author[1]{Haodong Liu}%
\author[1]{Hua Liu}%
\author[1]{Yongfu Chen}%
\author[2]{Zhiyang Xu}%
\author[1]{Yunchuan Dai}%
\author[1]{Qiao Chen}%
\affil[1]{Chinese Academy of Forestry}%
\affil[2]{Affiliation not available}%


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  \date{June 17, 2024}


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\begin{abstract}
Exploring vegetation distribution spatial patterns facilitates
understanding how biodiversity addresses the potential threat of future
climate variability, especially for highly diverse and threatened
tropical plant communities, but few empirical studies have been
performed over various environmental scales. In this study, we used
species-based and phylogeny-based methods to analyze the \selectlanguage{greek}α- \selectlanguage{english}and
\selectlanguage{greek}β-\selectlanguage{english}diversity pattern variation in Dacrydium pectinatum communities and
its key drivers along elevation and geographical gradients across three
national nature reserves in Bawangling, Diaoluoshan and Jianfengling.
Our study indicates that the species and phylogenetic \selectlanguage{greek}α-\selectlanguage{english}diversity
patterns presented consistent decreasing with elevation, with the peak
occurring at low elevations. Environmental filtering caused by decreases
in limiting factors, such as temperature, precipitation, soil organic
matter, soil phosphorus, and light, is the main reason for the decline
in diversity at high elevations, whereas low-elevation areas are
affected by various factors, such as environmental filtering and
similarity limitations. Species and phylogenetic \selectlanguage{greek}β-\selectlanguage{english}diversity changes are
closely related to environmental filtering and dispersal limitation, but
the latter is key in community assembly at the heterogeneous spatial
scale. In conclusion, combining species-based and phylogeny-based
methods to explore the biogeographic patterns of tropical plant
communities helps provide convincing evidence and confirms that the
relative contributions of niche and neutral theory in the assembly
process vary along environmental gradients. Though the D. pectinatum
community constitute a floristically integrated unit, the genetic
relationships between species are relatively far, and co-evolution to
promote species coexistence is difficult when faced with habitat
pressure. Hence, we believe that species coexistence in tropical plant
communities requires mild environmental conditions, and low
temperatures, precipitation, soil nutrients and light will aggravate
environmental filtering and species competition. We also recommend
strengthening the construction and management of nature reserves and the
exploration of biodiversity formation mechanisms, which are crucial for
biodiversity conservation in endangered tropical plant communities.%
\end{abstract}%



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