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.