Liu Haodong, Liu Hua, Chen Yongfu, Xu Zhiyang, Dai Yunchuan, Chen Qiao, Ma Yongkang
Research Institute of Forest Resource Information Techniques Chinese Academy of Forestry Beijing China.
Key Laboratory of Forest Management and Growth Modelling NFGA Beijing China.
Ecol Evol. 2021 Mar 13;11(9):4616-4630. doi: 10.1002/ece3.7361. eCollection 2021 May.
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. is a constructive and endangered species in the tropical mountain forests of Hainan Island, China. In this study, sixty-eight 30 m × 30 m permanent plots of were investigated, and species-based and phylogenetic-based methods were used to analyze the α- and β-diversity pattern variation and its key drivers. Our study showed that species and phylogenetic α-diversity patterns are different on a local scale. However, on a regional scale, the variations in the two α-diversity patterns tend to converge, and they decrease with increasing elevation. The phylogenetic structure changes from overdispersion to convergence with increasing elevation. Soil (SOM, TP, AP), topography (EL, SL), and stand (CD) factors and α-diversity showed close correlations. Species and phylogenetic β-diversity have significant positive correlations with changing environmental distance and geographical distance; however, as a representative form of habitat heterogeneity, elevation distance has a greater impact on β-diversity changes than geographical distance. In conclusion, the α- and β-diversity patterns of the community are mainly related to habitat filtering, especially in high-elevation areas, and the colonization history of various regions also affects the formation of diversity patterns. Species-based and phylogenetic-based methods robustly demonstrated the key role of the habitat filtering hypothesis in community assembly. We believe that more plant diversity patterns need to be explored to understand the biodiversity formation mechanisms in tropical forests. We also recommend strengthening the construction and management of nature reserves to help address the biodiversity loss crisis in endangered tropical plant communities.
探索植被分布的空间格局有助于理解生物多样性如何应对未来气候变率的潜在威胁，特别是对于高度多样且受到威胁的热带植物群落而言，但相关实证研究较少。 是中国海南岛热带山地森林中的一种建设性且濒危的物种。在本研究中，调查了68个30米×30米的永久性样地，并采用基于物种和基于系统发育的方法分析了α和β多样性格局的变化及其关键驱动因素。我们的研究表明，在局部尺度上，物种和系统发育α多样性格局有所不同。然而，在区域尺度上，两种α多样性格局的变化趋于收敛，且它们随海拔升高而降低。系统发育结构随着海拔升高从过分散转变为收敛。土壤（土壤有机碳、总磷、有效磷）、地形（海拔、坡度）和林分（胸径）因素与α多样性呈现出密切的相关性。物种和系统发育β多样性与环境距离和地理距离的变化呈显著正相关；然而，作为栖息地异质性的一种代表性形式，海拔距离对β多样性变化的影响大于地理距离。总之， 群落的α和β多样性格局主要与栖息地筛选有关，尤其是在高海拔地区，而且不同区域的定居历史也影响着多样性格局的形成。基于物种和基于系统发育的方法有力地证明了栖息地筛选假说在群落组装中的关键作用。我们认为，需要探索更多的植物多样性格局以了解热带森林中的生物多样性形成机制。我们还建议加强自然保护区的建设和管理，以帮助应对濒危热带植物群落中的生物多样性丧失危机。
