沿纬度和海拔梯度的中亚热带常绿阔叶林群落系统发育β多样性研究

项目名称： 沿纬度和海拔梯度的中亚热带常绿阔叶林群落系统发育β多样性研究

项目编号： No.31500341

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 生物科学

项目作者： 刘娟

作者单位： 江西农业大学

项目金额： 20万元

中文摘要： 群落系统发育β多样性通过对群落间系统发育相似性的分析，能评估生态过程（环境异质性）和进化过程（物种扩散）对群落生物多样性构建的影响，阐明群落构建机制。大部分群落系统发育β多样性研究集中在热带和温带森林中，亚热带研究较少，群落构建机制尚不清楚。在热带或亚热带地区，由于存在大量复杂的类群，利用DNA条形码技术构建群落系统发育树时很有必要增加核基因序列，可为分支末端分类单元提供更准确的系统发育关系。本项研究计划以沿海拔和纬度梯度变化的中亚热带常绿阔叶林木本植物群落为研究对象，并利用基于核基因片段组合DNA条形码构建高精确度的群落系统发育树，分析群落系统发育β多样性变化规律以及与环境因子和地理空间距离的关联，揭示亚热带常绿阔叶林群落构建机制。本项目的实施对常绿阔叶林的生物多样性保护和植被恢复具有重要意义。

中文关键词： 群落系统发育β多样性；亚热带常绿阔叶林；DNA；条形码；扩散限制；环境异质性

英文摘要： Comparison of the similarity of phylogenetic information, analyses of community phylogenetic β diversity could provide an excellent chance to test the effect of ecological process (environmental filtering) and evolutionary process (species dispersal) on community assembly. Despite phylogenetic frameworks having been developed in tropical and temperate forests, few studies have focused on subtropical community. Phylogenetic trees reconstructed by DNA barcoding data have the ability to provide high topological resolution which improved the power of the phylogenetic based mechanistic theories. For the improvement of the phylogenetic topogical resolution of closely related species, the nuclear DNA barcoding regions should be included into studies of tropical or subtropical forests. In this study, we focus on woody assemblages distributed along altitude and elevation gradients in three subtropical evergreen broad-leaved forests. Based on phylogenetic tree with high resolution using nuclear DNA barcoding, we analyze the pattern of the community phylogenetic β diversity and the relationship between phylogenetic β diversity and different environmental factors and spacer distance. We expect to clarify the contribution of environmental filtering and species dispersal in shaping subtropical evergreen broad-leaved forests.

英文关键词： Community phylogenectic β diversity;subtropical evergreen broad-leaved forests;DNA barcoding;dispersal limitation;environmental heterogeneity