摘要
物种共存机制作为群落生态学的核心议题,对认识群落结构特征及预测群落动态变化至关重要。本研究聚焦于云南半湿润常绿阔叶林,通过整合谱系发育信息和叶功能性状分析,探讨该植被类型群落构建特征及影响因素。研究选取了半湿润常绿阔叶林中的5个优势种,针对其8个叶功能性状和系统发育数据,将功能性状变异的影响因素划分为环境和环境+空间变量(生态位分化效应)、空间变量(随机性效应),以量化确定性过程和随机性过程对性状变异的影响,并分析功能性状沿环境梯度的变化趋势。结果表明:叶结构性状存在系统发育信号(干物质质量、比叶面积、比叶质量、叶厚度的K值>1,干物质质量P=0.05),其形成和发育主要受遗传差异的影响,但叶化学性状系统发育信号较弱(叶氮、叶磷、碳氮比的K值<1,P>0.05),在不同生境条件下,物种通过性状权衡策略来维持最佳生存状态;半湿润常绿阔叶林的群落构建是确定性和随机性过程共同作用的结果;水分条件是塑造半湿润常绿阔叶林优势种叶功能性状的关键环境因子,湿润指数和干燥指数对性状变异的解释率分别为19.1%和10.8%。在降水较少的区域,半湿润常绿阔叶林优势种倾向于通过增加比叶面积来提高水分利用效率,并增加碳储量。
The mechanism of species coexistence,as a core theme in community ecology,is critical for understand⁃ing community structure features,as well as for predicting community dynamics.We examined community assembly characters and influencing factors through the integration of phylogenetic information and leaf functional traits in semi⁃humid evergreen broad⁃leaved forests(SEBFs)in Yunnan,China.Eight leaf functional traits of five dominant tree species of SEBFs were examined along with phylogenetic data.To quantify the effects of deterministic and sto⁃chastic processes on leaf functional traits,the factors were categorized into environmental and environmental+spa⁃tial variables(representing niche⁃based processes)and spatial variables(representing stochastic processes).Func⁃tional trait changes along environmental gradients were analyzed.Leaf structural traits exhibited phylogenetic signals(Blomberg’s K>1 for dry matter content,specific leaf area,leaf mass per area,and leaf thickness,with P=0.05 for dry matter content),suggesting their formation and development are primarily determined by genetic variation.Leaf chemical traits showed weak phylogenetic signals(K<1,P>0.05 for leaf nitrogen,leaf phosphorus,and car⁃bon⁃to⁃nitrogen ratio),indicating the traits of different tree species maintain optimal performance by trade⁃off strate⁃gies across different habitats.Community assembly in SEBFs is a result of the combined effects of deterministic and tree species.Wetness and aridity explained 19.1%and 10.8%variations of leaf functional trait,respectively.In ar⁃eas with less precipitation,dominant species in SEBFs tend to increase specific leaf area to enhance water use effi⁃ciency and increase carbon storage.
作者
李昕蓉
彭明俊
彭明春
康娅
方盛权
兰纯妍
赵彪
陈登鹏
李云
王崇云
LI Xinrong;PENG Mingjun;PENG Mingchun;KANG Ya;FANG Shengquan;LAN Chunyan;ZHAO Biao;CHEN Dengpeng;LI Yun;WANG Chongyun(School of Ecology and Environmental Science,Yunnan University,Kunming 650091,China;Yunnan Academy of Forestry and Grass-land,Kunming 650021,China)
出处
《生态学杂志》
北大核心
2025年第7期2174-2184,共11页
Chinese Journal of Ecology
基金
云南省基础研究专项重大项目(202101BC070002)资助。
关键词
半湿润常绿阔叶林
叶功能性状
谱系发育
群落构建
环境梯度
semi⁃humid evergreen broad⁃leaved forest
leaf functional trait
phylogeny
community assembly
environmental gradient
