生态学报2025，Vol.45Issue(18)：8862-8875,14.DOI:10.20103/j.stxb.202409232305
库车北山植物群落物种系统发育多样性及功能多样性沿海拔梯度的分布格局
Phylogenetic and functional diversity patterns of plant communities along the altitude gradient in the Beishan Mountains of Kuqa
摘要
Abstract
Integrating functional and phylogenetic diversity provides valuable insights into ecological selection strategies,spatial distribution patterns,and mechanisms of diversity maintenance in plant communities.Additionally,investigating the mechanisms underlying plant community assembly in mountainous regions support the conservation of plant resources and the ecological environments.While most previous studies focused on combining species diversity and phylogenetic diversity to reveal community assembly mechanisms,fewer have considered both functional and phylogenetic diversity simultaneously.In this study,the plant communities at varying altitudes in the Beishan mountains of Kuqa were investigated.Patterns of phylogenetic and functional diversity across altitudinal gradients were analyzed by integrating functional trait data and phylogenetic information.Environmental factors influencing these diversity patterns were identified to reveal the mechanisms driving plant community diversity and its maintenance in the study area.The results showed:(1)The functional richness index(FRic)and functional evenness index(FEve)exhibit a"single-peak"pattern with increasing altitude,peaking at 2300 m above sea level;The Functional Dispersion Index(FDis)followed a"unimodal"trend,initially decreasing and then increasing with altitude,with the highest value observed at 3100 m above sea level;The Rao'Quadratic Entropy Index(Rao'Q)showed a monotonic decrease with increasing altitude.The phylogenetic diversity index(PD)exhibited a"single-peak"pattern,initially increasing and then decreasing with altitude.The phylogenetic structure index shifted from overdispersion to aggregation.Overall,competitive exclusion was the primary mechanism driving the assembly of low-altitude communities,whereas habitat filtering was the dominant factor influencing the construction of high-altitude communities.(2)The phylogenetic signal K values of species functional trait indicators in the plant communities of the study area showed that,except for plant height,the K values for all other traits were less than 1.This indicated that environmental heterogeneity has a stronger influence on the functional traits of plant communities than evolutionary history.(3)Redundancy analysis showed that altitude is the primary factor influencing the distribution of plant communities in the Beishan mountains of Kuqa,followed by mean annual temperature,soil available potassium,soil ammonium nitrogen,and soil water content.Stepwise regression analysis further revealed that mean annual temperature significantly influenced the phylogenetic diversity index(PD)and the net relatedness index(NRI).The net taxonomic index(NTI)was primarily affected by altitude and nitrate nitrogen.Functional diversity indices were influenced by altitude,soil nitrogen and phosphorus,as well as soil water content.关键词
库车北山/功能多样性/系统发育多样性/环境因子/海拔Key words
Kuqa Beishan/functional diversity/phylogenetic diversity/environmental factors/altitude引用本文复制引用
樊晓玲,刘彬,孙庆振,王恩召,钱慧玲,张云玲..库车北山植物群落物种系统发育多样性及功能多样性沿海拔梯度的分布格局[J].生态学报,2025,45(18):8862-8875,14.基金项目
国家自然科学基金地区基金项目(32160271) （32160271）
