不同稳定性群落下飞机草种群繁殖特性分析

为揭示桂西南喀斯特区域不同群落稳定性对飞机草种群入侵、定居、生存和发展能力的影响,本文通过分析飞机草实生、萌生株数、总株数及实生/萌生株数比的变化规律,探讨飞机草种群在不同稳定性生境下所采取繁殖策略及繁殖能力变化规律.结果表明,不同稳定性群落下飞机草采取的主要繁殖策略和繁殖能力不同.在资源较缺乏的稳定性强和中等生境下,飞机草主要利用克隆繁殖来维持种群的存活和发展,在资源充裕、稳定性较差的生境下,飞机草群落主要以种子繁殖来谋求种群的拓展,或以种子和克隆两种繁殖对策来谋求种群的稳定和发展.稳定性差群落飞机草的种子和克隆繁殖能力均较稳定性强群落飞机草的强.

Analysis of Reproductive Characteristics of Eupatorium Odoratum Populations in Different types of Stability Habitats

To reveal the effects of different types of stability habitats in karst region of Southwest Guangxi on invasion,settlement,survival and development capacity of Eupatorium odoratum populations,the variation of seedling plants,cloning plants,total plants and ratios of seedling plants and cloning plants were analyzed to study the changes of reproductive strategies of Eupatorium odoratum population.The results show that reproductive strategies and reproductive ability of Eupatorium odoratum population are different in different types of stability habitats.Eupatorium odoratum mainly adopted clonal reproduction to maintain the survival and development of population in high and middle stability habitats when lacking of resources.Eupatorium odoratum mainly used seed propagation to seek the expansion of population,or adopted seeds and reproductive strategies to seek population stability and development in less stable habitats when abundant of resources.The ability of seed and clonal propagation in less stable habitats are higher in high stability habitats.