秦岭华山松种群格局规模与林窗特征

Spatial distribution pattern,its scale,and gap characteristics of Pinus armandii population in Qinling Mountains

基于秦岭林区华山松群落的20 m×20 m的27块样地的野外调查数据,运用样方法和无样地法对其种群的空间分布型进行了测定,运用Greig-Smith相邻格子样方法对其作了格局分析,判定了种群的格局规模;同时对华山松林窗做了详细的调查。结果表明,(1)种群在0~50龄时,空间分布格局为集群分布;在15~25龄时,种群有向随机分布转变的趋势,但仍属于集群分布;40~50龄种群处于由集群分布向随机分布的过渡期;50龄以后种群趋于衰退,分布格局由集群分布转向随机分布。(2)华山松种群集群分布的格局规模同样随着发育阶段的不同而有所变化。但总的来说格局的大小在100 m2。(3)华山松林窗大小与格局规模的大小相近,其中林窗大小在80~130 m2的占59%。由于林窗内光照养分条件较好,又形成与格局规模大小一致的华山松更新幼苗,进而通过“移动镶嵌循环”更新和维持种群的稳定性。

Based on the data collected from 27 plots of Pinus armandii community in the Qinling Mountains,this paper studied the spatial distribution pattern,its scale,and gap characteristics of P.armandii population.The results showed that P.armandii population had a contagious distribution before age 50.At the age from 15 to 20,though the population tended to distribute randomly,the distribution was still contagious.The population at the age from 40 to 50 was at the transitional stage from contagious to random distr...