Abstract: Based on the niche breadth, 38 wood plants in Mount Bei of Jinhua could be divided into three groups, which are GroupⅠ (including Pinus massoniana、Eurya maricata、Quercus glandulifera and other 7 wood plants whose niche breadth were wider than 0.2)、GroupⅡ (including Pinus Taiwanensis、Castanopsis sderophylla、Castanea hennyi and other 9 wood plants whose niche breadth were from 0.1 to 0.2) and Group Ⅲ (including Platycarya strobilaceae、Rhododendron ovatum、Cinnanomum camphora and other 13 wood plants whose niche breadth were narrow er than 0.1); Based on the niche overlap, there were four groups of wood plants distinguished, which are Group Ⅰ (including Pinus taiwanensis、Rhododendron sinsii、Serissa foetida and the others)、Group Ⅱ (including Pinus massoniana、Quercus glantulifera、Loropetalium chinensis and the others)、GroupⅢ (including Cinnamomum camphora、Quercus fabri、Liquidambar formosana and the others) and Group Ⅳ (including Dalbergia hupeama、Elaocaynus multiflora、Vaccinium bracteatum and the others).The paper pointed that when calculate plant niche overlap, the community similarity coefficient should be calculated at first, the site with the minimal similarity total value coauld be taken as the polar one, based on their similarity coefficients with the polar site, the sites are arranged in order to make the series of the sites with ecological gradient, the ecological distance intervals of sites could be worked out.It was also pointed that we could apply the minimal spanning tree method of clustering analysis to compare the ecological similarities of plants based on their niche overlapes.The results of the paper proved the method proposed above practicable.

Key words: Niche, Wood plant, Mountbei of Jinhua