Inter-specific Association of Species in the Arbor Layer in Cyclobalanopsis elevatiocostata Natural Forest

The overall association of 28 dominant species in the arbor layer of Cyclobalanopsis elevatiocostata natural forest located in Mount Zhitishan, Ningde Municipality, was analyzed by applying a series of techniques including variance analysis, x²-test, association coefficient calculated based on a 2×2 contingency table.And a fuzzy clustering was done to determine the overall association of all species, and the association of each species-pair.It was showed by the results that the overall association of all species was not significantly positive in the natural forest.By AC values analyzed, 152 species-pairs were positively associated and 170 species-pairs were negatively associated. By x²-test, 12 species-pairs appeared to be significantly negative association at ρ=0.01, and 93 species-pairs was negative association at ρ=0.05.