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 trees M and M V increased with DBH. Average mingling of the evergreen broadleaved forest community was respectively M =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.

Key words: evergreen broadleaved forest, population, mingling, Voronoi diagram, Tianmu Mountain