Bamboo-faxon fir forest is one of the most important dark coniferous forests in western Sichuan province,China.The spatial patterns and associations of dominant tree species in the forest were researched to offer references for restoration and conservation of the dark coniferous forests.Using Ripley’s univariate L(t)and bivariate L12(t) functions,we analyzed the spatial patterns and inter-specific associations of three dominant tree species in a 40 m×40 m primeval bamboo-faxon fir forest plot in sub-alpine area of western Sichuan,China.The results showed that stratification of the vertical structure of the plant community was obvious.There were three dominant tree species which Abies faxoniana,Betula albosinensis and Picea asperata.L(t).Function analysis showed the spatial patterns of three dominant tree species were changed with scales.A.faxoniana was significantly aggregated at 0~11 m scale,while randomly distributed at 11~20 m scale.B.albosinensiswas significantly aggregated at 0~14 m scale,while randomly distributed at 14~20 m scale.P.asperata clumped and was distributed at 0~20 m scale.From the analysis of L12(t)function,the results showed three dominant tree species were significantly independent with each other at the scales of 0~20 m,indicating that those species had little influence on each other.
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