Spatial Pattern Analysis of Individuals in Different Age Classes of Liriodendron chinensis Sarg in Maoer Mountain Reserve

Taking the spatial distribution pattern of Liriodendron chinensis Sarg(360 m×180 m)for the natural population in Maoershan Reserve as research group.The spatial distribution pattern in this natural population of L. chinense was investigated in the application of O-ring function.The results showed that age class structure of L.chinense in the isolated population was characterized by the pyramid,indicating that the population was in an incremental status. The distribution pattern of this population was closely related to the spatial scale,with an aggregation distribution in less than 24m,a random distribution in 24～48m spatial scale,a hypodispersion distribution in 49～88m spatial scale and a random distribution in larger than 88m.The fine-scale spatial distribution pattern was obvious differences among growth stages in this natural population.Both the adult and young individuals showed aggregation distribution at smaller spatial scale,and random distribution at other spatial scale.Whereas,for those aging individuals,only one pattern of random distribution was identified at all spatial scales.The spatial correlation among development stages were positive at smaller scale,while at larger scale,no close association was identified.