雷公山自然保护区秃杉种群结构及分布格局特征

Population Structure and Distribution Pattern of Taiwania cryptomerioides in Leigongshan Nature Reserve

为揭示苗岭地区秃杉的种群特征,使用实测和样地相结合调查秃杉种群数量,在典型分布区分别设置20个20m×20m样地,以种群年龄结构、生命表、存活曲线、生存函数分析秃杉种群的生命过程,并计算分散度量化种群空间分布格局特征。研究表明:(1)雷公山自然保护区秃杉生活史以1龄级和2龄级死亡率最高,到3龄级阶段仅0.63%幸存,存活曲线趋向于DeeveyⅢ型。(2)分布格局为集群型(S2>m),且种群个体极不均匀,局部区域密集,以海拔1050~1150m分布最为集中,占整个保护区分布区秃杉总株数的31.97%;(3)秃杉群落中秃杉主要分布在0~5m和25m以上的林层中,对秃杉1龄级和2龄级母树林下及周围的植被进行适当干扰,有利于秃杉种群的发展。

In order to reveal the population characteristics of Taiwania cryptomerioides in Miaoling area,the population quantity of Taiwania cryptomerioides was investigated by the combination of field measurement and sample plot.2020m×20 m plots were set up in the typical distribution area to analyze the life process of Taiwania cryptomerioides population by age structure,life table,survival curve and survival function,and the spatial distribution pattern characteristics of dispersed metric population were calculated.The results showed that:(1)The mortality rate of Taiwania cryptomerioides in the first and second age groups was the highest in Leigongshan Nature Reserve,and only 0.63%survived in the third age group.The survival curve tended to Deevey III.(2)The distribution pattern was clustered(S2>m),and the individual population was extremely uneven and the local area was dense.The distribution of Taiwania cryptomerioides was most concentrated at 1050-1150m altitude,accounting for 31.97%of the total number of Taiwania cryptomerioides trees in the whole reserve;(3)Taiwania cryptomerioides mainly distributed in the forest layers of 0-5m and 25 m above,it was beneficial to moderately interfere with the vegetation under and around the first and second age parent forests of Taiwania cryptomerioides.