Environmental and spatial contributions to tree community assembly across life stages and scales in evergreen-deciduous broadleaf karst forests,southwest China  

作　　者：Liang Su Hu Du Fuping Zeng Wanxia Peng Hua Wang Kelin Wang Menzhen Lu Tongqing Song 

机构地区：[1]Key Laboratory of Agro-Ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academic of Sciences,Changsha,People’s Republic of China [2]Guangxi Key Laboratory of Karst Ecological Processes and Services,Huanjiang Observation and Research Station of Karst Ecosystem,Chinese Academic of Sciences,Huanjiang,People’s Republic of China [3]College of Resources and Environment,Hunan Agricultural University,Changsha,People’s Republic of China

出　　处：《Journal of Forestry Research》2023年第5期1323-1331,共9页林业研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (42071073,31971487);Youth Innovation Promotion Association of the Chinese Academy of Sciences (2021366);Guangxi Key Research and Development Program (AB17129009);the Hechi Distinguished Expert Program to Fuping Zeng;the Guangxi Bagui Scholarship Program to Dejun Li。

摘　　要：Spatial and environmental processes are two ecological processes that have attracted considerable attention in plant community assembly,depending on sampling scale and life history.However,the processes that determine community assembly have not been studied in the karst region of southwest China.In this study,a 25-ha(500 m×500 m)monitoring plot within the subtropical climax forest in the karst region was established and canonical correspondence analysis was used to reveal the effects of topography and soil on the spatial patterns of tree community assembly.Our study suggests that spatial processes dominate species composition and the combined effects of spatial and environmental processes play an important role.Overall interpretation rate increases with enlarging the sampling scale.However,the pattern of variation partitioning was similar in different life stages.Environmental variables significantly affected species composition at different sampling sizes and life histories and had a higher interpretation rate of species composition on larger s ampling sizes.Topographic wetness index was the most important variable to explain species composition of the environmental variables.These results suggest that it is necessary to consider the relative importance of environmental and spatial factors on community assembly to better understand,conserve,and manage subtropical karst forests.

关 键 词：Species composition Spatial distribution Variation partitioning Community assembly Karst ecosystems 

分 类 号：S718.5[农业科学—林学]