【摘要】 在浙江天目山国家级自然保护区内,选择较典型的常绿阔叶林设置大小为100m×100m的样地,用全站仪测定每株树木的三维坐标;提出基于Voronoi图的混交度MV,并对MV和传统混交度M进行比较分析。结果表明:MV通过Voronoi图的相邻多边形确定对象木的最近邻木,比M能更准确地描述种间相互隔离关系;在常绿阔叶林群落中,单株树木的混交度M和MV均随胸径的增加而增大;群落平均混交度-M=0.7207,-MV=0.7431,表明不同树种之间的相互隔离程度较高;群落优势种群的平均混交度低于非优势种群,常绿种群的平均混交度低于非常绿种群,其原因是细叶青冈、青冈和短尾柯既是优势种群,又是常绿种群,且它们具有聚集繁殖特性。更多还原

【Abstract】 One typical plot of 100 m×100 m was surveyed in Tianmu Mountain National Nature Reserve,Zhejiang Province.Total station was used to measure three-dimension coordinates of trees.Mingling index(M_V)was calculated based on Voronoi diagram,and M_V was compared with traditional mingling M.The results showed that:M_V reflected real situation because the nearest neighbors was determined by Voronoi diagram.M_V was more accurate than M in describing interspecific separate relation.In the evergreen broad-leaved forest,individual tree’s M and M_V increased with DBH.Average mingling of the evergreen broad-leaved forest community was respectively = 0.720 7 and _V= 0.743 1,which suggested there was a high degree of interspecific separation.Average mingling of dominant populations was lower than that of non-dominant populations,and average mingling of evergreen species was lower than that of non-evergreen species.Cyclobalanopsis myrsinaefolia,C.glauca and Lithocarpus brevicaudatus in the forest are propagated in clusters,and they are not only dominant populations but also evergreen species,which likely illustrated the low average minglings of dominant populations and evergreen species.更多还原