沉水植物功能性状变异的来源与结构以微齿眼子菜(Potamoge-ton maackianus)为例？  

Sources and structures of functional traits variations in submersed macrophytes: A case of Potamogeton maackianus

作　　者：符辉[1,2] 钟家有[1] 袁桂香[1] 曹特[2] 倪乐意[2] 

机构地区：[1]江西省水利科学研究院,江西省鄱阳湖水资源与环境重点实验室,南昌330029 [2]中国科学院水生生物研究所,东湖湖泊生态系统试验站,淡水生态与生物技术国家重点实验室,武汉430072

出　　处：《湖泊科学》2015年第3期429-435,共7页Journal of Lake Sciences

基　　金：国家自然科学基金青年基金项目(31300398,31400404)资助

摘　　要：植物功能性状的变异不仅受到物种个体发育的影响，还因环境而变化.以沉水植物微齿眼子菜（ Potamogeton maackianus）为例，设计了5个生态尺度（依次为湖泊、样带、样点、样方、个体），测定了681株个体的11个功能性状，分析其变异的来源与结构.结果表明：1）微齿眼子菜功能性状的种内变异为0.40~1.21；2）5个生态尺度均对这些功能性状具有显著影响，但特定生态尺度的影响程度与功能性状的选择有关.个体尺度的变异构成了这些功能性状变异的主要来源，而湖泊、样带、样点尺度是茎重和节间数变异的主要组成部分；3）个体发育引起的变异约占总变异的5%~76%，且在各生态尺度均占一定比例，说明这部分变异同样是我们研究或者设计实验过程中不可忽视的因素.Functional traits variations are not only constrained by ontogeny but also affected by specific environmental factors. In this paper, the sources and structures of 11 functional traits in a macrophyte species Potamogeton maackianus are studied. We measured these traits from 681 individuals across five ecological scales：lake, transect, sample depth, sample area and individual. The results showed that：1） A great high trait variation （0. 40 1. 21） was observed within species. 2） The five ecological scales had a great influence on the structures of trait variations, depending on the selected specific trait. These measured traits were most responsive to individual scale, while stem mass and internode number were largely affected by environmental factors at scales of lake, transect and depth stratus. 3） Ontogenetic variance of these traits ranged from 5% to 76%, and was non-negligible at each ecological scale.

关 键 词：功能性状 变异 生态尺度 个体发育 沉水植物 微齿眼子菜 

分 类 号：Q948.8[生物学—植物学]