南方红豆杉无性系种群结构和动态研究  

Structure and dynamics of Taxus chinensis var. mairei clonal population

作　　者：李先琨[1] 向悟生[1] 苏宗明[1] 

机构地区：[1]广西壮族自治区中国科学院广西植物研究所,桂林541006

出　　处：《应用生态学报》2004年第2期177-180,共4页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金 ( 3 9960 0 18);广西科学基金匹配资助项目( 0 0 0 70 0 8)

摘　　要：研究了元宝山南方红豆杉克隆种群的结构和动态 .结果表明 ,种群S1～S6级个体均存在 ,S1、S2级个体占总个体数的 6 4 % .从元宝山南方红豆杉种群的大小级结构图看 ,结构呈较规则的金字塔形 ;南方红豆杉无性系幼树幼苗的贮备较为丰富 ,种群的年龄结构呈较规则的金字塔形 ,存活曲线近于倒J形 ;种群大小级动态指数Vpi=38.2 6 % ,考虑外部干扰时 ,Vpi′ =6 .38% >0 ,表现为稳定型种群 .南方红豆杉种群更新的主要途径是无性繁殖 ,种群的数量动态主要受克隆内部调节机制以及外部环境的影响 .生存分析结果表明 ,种群幼树幼苗的生存状态不稳定 ,死亡的可能性很大 。Structure and dynamics of Taxus chinensis var. mairei clonal population were studied. The results showed that according to the life history of Taxus chinensis var. mairei, the modular population could be divided into 6 classes. The development of Taxus chinensis var. mairei population was greatly depended on its ramets, which sprouted on its stem, and the population size structure was stable. The survival curve of Taxus chinensis var. mairei population showed a revered ‘J' type. To expanding and continuing the population, there were high ramet sprouting rate and the resource limit induced a higher seedling and sapling mortality rate. When sapling grew up as young tree, its adventitious root stretched into soil to assimilate the nutrient and water, and it became independence individual. Before germination, the seed of Taxus need to dormant for more than one year, and the bird and beast liked to eat the seed, so it was hard to find seedling and sapling from seed. Therefore Taxus chinesis var. mairei had been considered to be a decline or none descendant population. In this study, it was found that Taxus chinensis var. mairei had a powerful asexual multiplication in Yuanbaoshan, especially ramet sprouting on stem. It was depend on this way to develop and expand the population.

关 键 词：南方红豆杉 无性系种群 种群结构 种群动态 

分 类 号：S718.5[农业科学—林学]