基株和无性系水平上的仙湖苏铁种群分布格局

The distribution pattern of Cycas fairylakea on genet and clone population levels

从基株种群和无性系种群2个水平研究了仙湖苏铁种群的空间分布格局。结果表明:仙湖苏铁种群趋向于聚集分布,不同龄级种群的分布格局不同,基株种群幼苗级、幼树级呈随机分布,中年级和成年级呈聚集分布;无性系种群幼苗级表现为随机分布,其它3个年龄级呈现聚集分布。幼苗贮备的不足将严重影响种群的发展,使濒危程度进一步加剧。

The distribution pattern of Cycas fairylakea population was studied at genet and clone population levels in this paper. The results showed that the distribution pattern of C. fairylakea population appeared to have clumping distribution. The distribu- tion pattern of the population varied with different age classes at two levels. The seedlings and saplings showed random distribution and the mid-aged and mature individuals showed clumping distribution in genet population. The distribution pattern of the seedlings appeared to have random distribution and that of three class individuals appeared to have clumping distribution in clone population. The random distribution of the seedlings might have been relative to the scarcity of them, which would weaken the population and endanger the survivorship of the population.