油松种群不同龄级的空间格局与关联性分析

在霍山七里峪林场，选择典型油松林样地进行实地调查，运用点格局分析方法，对油松种群不同龄级的分布格局及其相互关系进行了研究。结果表明：(1)油松的龄级分布呈峰型，中间龄级个体多，主要集中在20～30 cm，小龄级和大龄级则相对较少；(2)油松的7个龄级个体的空间格局呈集群分布，其中龄级4、龄级5和龄级6的个体集群分布特征更为明显,同时表现出小尺度下呈集群分布，在大尺度下趋向于随机分布；(3)各龄级间的关系基本上呈显著正关联，3～5龄级的个体间正关联性更强，这种正关联的关系有利于油松种群对资源的充分利用,以确保种群的生存和发展。

Analysis of Spatial Pattern and Spatial Association of Pinus tabulaeformis Populations at Different Developmental Stages

In Huoshan Qiliyu woodland,a field survey was made on the typical Pinus tabulaeformis,and the distribution of P.tabulaeformis at different age-classes and its co-relationship were studied.The results show that:(1)The distribution of the age-classes appears kurtosis,i.e.the majority is the middle-aged,20-30cm,whereas the numbers of young and old are comparatively less;(2)The spatial distribution of these seven age-classes tends to be in groups,in which ages 4,5 and 6 are more obvious.Meanwhile,it centralizes in groups in small-scale and tend to be in random distribution in large-scale;(3)The co-relationship between different age-classes is significantly positive correlated,of which ages from 3 to 5 are more significant.This significantly positive correlation is beneficial for the P.tabulaeformis to make full use of the resources in order to guarantee the living and development of the groups.