五鹿山白皮松林不同龄级立木的点格局分析

白皮松是五鹿山自然保护区的重要保护植物。本文采用能够分析各种尺度下空间格局的分析方法—点格局分析法，以山西五鹿山自然保护区白皮松种群个体在空间分布的点图坐标为基础，对其进行了研究，结果表明：五鹿山白皮松不同龄级密度差异较大，中间龄级密度较大；6个龄级集群分布不明显，且随着龄级的增加集群分布特征逐渐减弱更加趋向于随机分布；龄级1和龄级2之间呈显著正关联，有利于种群的发展，其余各龄级之间在小尺度上关联性强，随着尺度的增大关联性减弱，说明龄级间的关联性与尺度密切相关。

Spatial Pattern Analysis of Individuals in Different Age-classes of Pinus bungeana in Wulu Mountain Reserve,Shanxi,China

Pinus bungeana is an important protective plant. Spatial pattern analysis of individuals in different age-classes of P.bungeana was conducted in the present study. Here we employed the technique of point pattern analysis which can analyze patterns under all scale along a gradient. The results showed: The densities of six age-classes were more different, and age-classes 2~5 had more individuals than the other two age-classes. The individuals of all age-classes were not clumping distributed in space, however their distribution pattern trended to random distribution varied with the change of scale. The co-relationship between age-class 1 and age-class 2 was significantly positive, this significantly positive correlation is beneficial for the development of the group. In the smaller scale, the individuals of different age-classes were a stronger spatial association. When the scale was larger, their spatial association would be weakened greatly. This showed the spatial patterns of different age-classes individuals and the spatial association between the individuals had a close relationship with the spatial scale.