闽江口琅岐岛朴树种群结构与空间分布格局

为了揭示琅岐岛朴树种群的维持机制,结合径级结构、聚集度指标,对朴树种群的结构与空间格局进行了研究。结果表明:(1)琅岐朴树种群结构稳定。幼苗充足,具有较强的自我更新能力,朴树萌枝更新突出,萌枝幼苗占总幼苗数的78%,萌枝作为对实生幼苗库的补偿,对于种群的维持和延续具有重要作用;从幼苗阶段到小树阶段存在较高的死亡率,有一定量的成年个体;不同样地朴树种群结构呈现稳定型和衰退型2种类型。(2)在调查的12个样地中,不同样地朴树个体空间格局有所不同,样地2、样地4朴树呈随机分布型,样地11为均匀分布,其他的则是聚集分布。(3)不同发育阶段的空间分布格局有所变化,表现出随着朴树幼苗的生长,其格局逐渐从聚集格局过渡到随机格局,呈扩散趋势。

Population structure and spatial pattern of Celtis sinensis on Langqi Island of Minjiang Estuary

Based on the investigation data from 12 plots in Landqi Island of Minjiang Estuary,and by using age structure and aggregation indices,this paper analyzed the population structure,spatial pattern,and recruitment mechanism of Celtis sinensis forest on the island. The results showed that the C. sinensis population was stable,with an expanding age structure,and the seedlings were abundant,exhibiting stronger regeneration ability. The sprouts,accounting for 78% of the total seedlings,played an important role in ...