Effects of functional diversity and phylogenetic diversity on the tropical cloud forest community assembly
Effects of functional diversity and phylogenetic diversity on the tropical cloud forest community assembly
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DOI：
10.17521/cjpe.2019.0003
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发表时间：
2019-03-01
影响因子：
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通讯作者：
Zhu Kong-Xin
中科院分区：
文献类型：
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作者：
Cheng Yi-Kang;Zhang Hui;Zhu Kong-Xin
系统发育多样性和功能多样性是物种多样性的重要组成部分，在群落组装机制中起着重要作用。本研究采用系统发育和功能多样性分析方法，对海南岛热带云雾林植物群落的群落聚集机制进行了初步探讨。我们对这些物种的13个功能性状进行了测量，并评估了它们的系统发育信号。此外，对7个环境因子进行了测定，并利用主成分分析（PCA）对它们之间的关系进行了评价。在此基础上，采用Rao's二次熵（RaoQ）和平均成对距离（MPD）指数，研究了功能多样性和系统发育多样性对热带云雾林群落聚集的影响。为了做到这一点，我们将这些指数与假设中性社区集合的零模型下的期望值进行了比较。结果表明：在热带云雾林群落中，林冠开度、土壤全磷含量和坡度是显著的环境因子，而林冠开度、土壤全磷含量和坡度是显著的环境因子。多数功能性状的系统发育信号很低且不显著, 说明热带云雾林群落的系统发育关系与功能性状随历史进程变化不一致。RaoQ和MPD的观测值均显著低于预期值，且其标准效应大小与土壤磷含量显著相关，表明土壤磷驱动的生境过滤是驱动热带云雾林群落聚集的关键因素。
Aims Phylogenetic and functional diversity are important components of species biodiversity, and are thought to play key roles in the mechanisms of community assembly. In this study, we explore the mechanisms of community assembly in tropical cloud forest plant community in Hainan Island, in southern China, using phylogenetic and functional diversity based methods.Methods We constructed a species pool of 186 woody plant species from three tropical cloud forest sites in Hainan Island. For these species, we measured 13 functional traits and assessed their phylogenetic signals. In addition, we measured seven environmental factors and assessed their relationships using Principal component analysis (PCA). Then we chose Rao's quadratic entropy (RaoQ) and mean pairwise distance (MPD) indices to examine the effects of functional diversity and phylogenetic diversity on tropical cloud forest community assembly. To do this we compared these indices to expectations under null models that assume neutral community assembly. We used standard effect sizes to evaluate the influence of environmental factors on community assembly.Important findings Canopy openness, soil total phosphorus content and slope were significant environmental predictors in tropical cloud forest. The phylogenetic signals of most functional traits were very low and not significant, indicating that the phylogenetic relationship and functional traits were not consistent with the change of historical process. The observed values of RaoQ and MPD were significantly lower than expected, and their standard effect sizes were significantly correlated with soil phosphorus content, which suggested that habitat filtering driven by soil phosphorus was the key factor driving the community assembly in tropical cloud forest.