Environmental and spatial contributions to seedling and adult tree assembly across tropical,subtropical and subalpine elevational gradients  

作　　者：Xiaoyang Song Min Cao Roger L.Kitching Yong Tang Zhenhua Sun Akihiro Nakamura Melinda J.Laidlaw Jie Yang 

机构地区：[1]Key Laboratory of Tropical Forest Ecology,Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Yunnan 666303,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Griffith School of Environment and Environmental Futures Research Institute,Griffith University,Nathan,Brisbane QLD 4111,Australia [4]Department of Science,Information Technology and Innovation,Queensland Herbarium,Toowong,Queensland 4066,Australia

出　　处：《Journal of Plant Ecology》2019年第1期103-112,共10页植物生态学报（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China(31400362 and 31670442);National Key Basic Research Program of China(2014CB954100);the West Light Foundation of the Chinese Academy of Sciences,the Chinese Academy of Sciences Youth Innovation Promotion Association(2016352);the Queensland-Chinese Academy of Sciences Biotechnology Fund(GJHZ1130);the Applied Fundamental Research Foundation of Yunnan Province(2014GA003 and 2013FB079).

摘　　要：Aims Quantifying the relative importance of the mechanisms that drive community assembly in forests is a crucial issue in community ecol-ogy.The present study aims to understand the ways in which niche-based and spatially based processes influence community assembly in areas in different climatic conditions and how these processes change during the transition from seedling to adult.Methods In this study,we investigated how taxonomic and phylogenetic beta diversity in seedling and adult stages of forest trees change across three elevational transects in tropical,subtropical and subalpine for-ests in Southwest China,and the relationships of these changes to the environment and inter-site distances.We quantified the relative contribution of environmental conditions and spatial distribution to taxonomic and phylogenetic beta diversity of both seedling and adult life stages along each elevational transect.We also quantified the taxonomic and phylogenetic similarity between seedlings and adult trees along elevations.Important Findings Taxonomic and phylogenetic beta diversity of both seedlings and adult trees increased with an increase in both environmental distance and spatial distance in all three transects.On both taxonomic and phylo-genetic levels,the effects of environmental filtering and spatial dispos-ition varied between life stages and among forest types.Phylogenetic similarity between seedlings and adult trees increased with elevation,although the taxonomic similarity did not show clear elevational pat-terns.Our results suggest that the relative contribution of niche-based and space-based processes to taxonomic and phylogenetic assem-blages varies across major plant life stages and among forest types.Our findings also highlight the importance of ontogenetic stages for fully understanding community assembly of long-lived tree species.

关 键 词：beta diversity dispersal limitation environmental filtering PHYLOGENY 

分 类 号：Q94[生物学—植物学]