Feng Gang, Mi Xiangcheng, Eiserhardt Wolf L, Jin Guangze, Sang Weiguo, Lu Zhijun, Wang Xihua, Li Xiankun, Li Buhang, Sun Ifang, Ma Keping, Svenning Jens-Christian
Section for Ecoinformatics and Biodiversity, Department of Bioscience, Aarhus University, Ny Munkegade 114, DK-8000 Aarhus CDenmark.
State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing.
Sci Rep. 2015 Mar 23;5:9337. doi: 10.1038/srep09337.
Local communities are assembled from larger-scale species pools via dispersal, environmental filtering, biotic interactions, and local stochastic demographic processes. The relative importance, scaling and interplay of these assembly processes can be elucidated by comparing local communities to variously circumscribed species pools. Here we present the first study applying this approach to forest tree communities across East Asia, focusing on community phylogenetic structure and using data from a global network of tropical, subtropical and temperate forest plots. We found that Net Relatedness Index (NRI) and Nearest Taxon Index (NTI) values were generally lower with geographically broad species pools (global and Asian species pools) than with an East Asian species pool, except that global species pool produced higher NTI than the East Asian species pool. The lower NRI for the global relative to the East Asian species pool may indicate an important role of intercontinental migration during the Neogene and Quaternary and climatic conservatism in shaping the deeper phylogenetic structure of tree communities in East Asia. In contrast, higher NTI for the global relative to the East Asian species pool is consistent with recent localized diversification determining the shallow phylogenetic structure.
当地群落是通过扩散、环境过滤、生物相互作用以及局部随机种群统计过程从更大尺度的物种库中聚集而成的。通过将当地群落与不同界定范围的物种库进行比较，可以阐明这些组装过程的相对重要性、尺度及相互作用。在此，我们展示了第一项将此方法应用于东亚森林树木群落的研究，重点关注群落系统发育结构，并使用来自热带、亚热带和温带森林样地全球网络的数据。我们发现，除了全球物种库产生的最近类群指数（NTI）高于东亚物种库外，与地理范围较广的物种库（全球和亚洲物种库）相比，净亲缘关系指数（NRI）和最近类群指数（NTI）值通常在东亚物种库中更低。相对于东亚物种库，全球物种库较低的NRI可能表明在新近纪和第四纪期间洲际迁移以及气候保守性在塑造东亚树木群落更深层次系统发育结构方面发挥了重要作用。相反，相对于东亚物种库，全球物种库较高的NTI与近期局部多样化决定浅层次系统发育结构是一致的。
