Abstract: Age structures of tillers,rhizomes and potential populations of Calamagrostis macrolepis populations under two habitats in Yili of Xinjiang were measured and analyzed by the unit area sampling method.The objective was to explore response strategies of Calamagrostis macrolepis populations on different habitat conditions,and to reveal the reproductive potential of Calamagrostis macrolepis populations.Results showed that the tillers of Calamagrostis macrolepis populations consisted of reproductive tillers and vegetative tillers under both habitats.Tillers,rhizomes,winterness tillers and buds all had four age classes.Tiller nodes of rhizomes could reproduce a maximum four generations and survive five growing seasons.The number and biomass of tillers of every age class were ranked as 1st>2nd>3rd>4th,while the number of buds of every age class was ranked as 0>1st>2nd>3rd,and the buds of 0 age class had absolute dominance.The biomass of rhizomes and the number of winterness tillers under both habitats had the structure characteristics of younger age classes as dominant position.Tillers,rhizomes,winterness tillers and buds under both habitats all showed expansive age structures.

Key words: Calamagrostis macrolepis, Tiller, Rhizome, Winterness tiller, Buds, Age structure

摘要： 通过单位面积取样的方法,测定分析了新疆伊犁2种生境下大拂子茅(Calamagrostis macrolepis)种群分蘖株、根茎和潜在种群的年龄结构,旨在探索大拂子茅种群对不同生境条件的响应策略,揭示大拂子茅种群的繁殖潜力。结果表明:大拂子茅种群分蘖株在2种生境下均由营养分蘖株和生殖分蘖株组成;分蘖株、根茎、冬性苗和芽均有4个龄级;根茎分蘖节最多繁殖4个世代,最多可存活5个生长季;分蘖株数量和生物量为1龄>2龄>3龄>4龄;芽数量为0龄>1龄>2龄>3龄,以0龄芽占绝对优势;根茎生物量、冬性苗数量在2种生境样地也具有低龄级相对占优势的结构特征。2种生境下大拂子茅种群分蘖株、根茎、冬性苗和芽等构件均呈增长型年龄结构。

关键词: 大拂子茅, 分蘖株, 根茎, 冬性苗, 芽, 年龄结构