暖温带–北亚热带过渡带落叶阔叶林群落不同径级系统发育结构的变化  

Phylogenetic structure of individuals with different DBH sizes in a deciduous broad-leaved forest community in the temperate-subtropical ecological transition zone, China

作　　者：任思远[1] 王婷[1] 祝燕[2] 叶永忠[1] 袁志良[1] 李聪 潘娜[1] 李鹿鑫 

机构地区：[1]河南农业大学,郑州450002 [2]中国科学院植物研究所植被与环境变化国家重点实验室,北京100093 [3]河南省新郑市气象局,河南新郑451100

出　　处：《生物多样性》2014年第5期574-582,共9页Biodiversity Science

基　　金：国家自然科学基金(31270493);中科院植物所植被与环境变化国家重点实验室2012年开放课题(LVEC-2012kf06)

摘　　要：群落的系统发育结构能够有效地反映各种生态过程对群落组成的影响,通过研究群落系统发育结构能推断出其形成的生态过程,对于揭示群落动态具有重要意义。作者将宝天曼1 ha落叶阔叶林样地分为10 m×10 m、20m×20 m、25 m×25 m三个尺度的样方,将样地内乔木个体划分为小径级(1 cm≤DBH<5 cm)、中径级(5 cm≤DBH<10 cm)、大径级(DBH≥10 cm)三个径级,通过比较各个阶段系统发育结构的变化,来分析其群落系统发育结构的生态过程。不同零模型的比较发现,宝天曼落叶阔叶林群落的净系统发育亲缘关系指数(net relatedness index,NRI)和最近种间亲缘关系指数(net nearest taxa index,NTI)值都随着研究尺度和径级的增加而降低,表明该群落在不同时空尺度上都表现出群落系统发育结构发散,而且系统发育密度制约对大径级个体的系统发育结构的影响大于小径级个体。上述结果说明密度制约是地处暖温带–亚热带过渡带的宝天曼落叶阔叶林群落物种多样性维持的重要机制。Phylogenetic structure of a community could effectively reflect underlying ecological processes of a community. Understanding phylogenetic structure of a community will help reveal the ecological processes associated with community dynamics. Data in a 1-ha plot were divided into quadrats at three spatial scales （10 m×10m, 20m×20 m, and25 m×25 m） and threeDBH sizes （1 cm ≤ DBH〈5 cm, 5 cm ≤ DBH〈10 cm, DBH ≥10 cm） to compare phylogenetic structures and to infer ecological processes of the community in a deciduous broad-leaved forest in the Baotianman National Nature Reserve. It was shown that NRI （net relatedness index） and NTI （net nearest taxa index） decreased with increasing spatial scales and DBH sizes. These results indicated that, phylogenetic structure of this community were overdispersed at different spatial scales and DBH sizes; and phylogenetic density dependence exerted higher effect on lager DBH classes than smaller ones. Our results suggested that phylogenetic density dependence is an important mechanism in regulating species diversity and shaping community structure of the deciduous broad-leaved forest in the temperate-subtropical ecological transition zone of China.

关 键 词：落叶阔叶林 群落系统发育结构 密度制约 空间尺度 径级 

分 类 号：Q948[生物学—植物学]