| Previous studies about community assembly rule were mostly based on species, which is rather an efficient when the number of species in habitat is two or three. With the escalation of species richness, the method become more and more difficult and the ability of explanation and prediction becomes weak. Different from it, the methods based on traits are gaining recognition by more and more researchers in the study of community assembly rules for its quantitative, simplicity, systematic and predictable. There are two non-random processes in community assembly:trait convergence pattern and trait divergence pattern. The pattern of the range decreases presented by trait in the effect of habitat and mutualism is called trait convergence pattern. On the other hand, the pattern of distances among traits get larger in the influence of competition and disturbance is called trait divergence pattern. In this paper, we take hill community of subalpine as study subject, measuring direct environmental factors-soil moisture, light intensity-and indirect environmental factors-slope, aspect, selecting various sizes of sub-communities in the gradient from south-facing to north-facing slope. The aim is to get the assembly rules of communities, to analyze the factors impacting on the assembly and the relationship between environmental factors and studies of community assembly. Get three conclusions as following:(1)There are only two cases of significant trait convergence assembly pattern in all communities and none for trait divergence assembly pattern.(2)The selection of statistical methods and traits, null model, scale and intraspecific variation have relative important influence on community assembly.(3)Relative to direct environmental factors, indirect ones are efficient in presenting the information of environment. Taking indirect environmental factors as environmental condition relative to direct ones significantly improved the detection of TCAP, and there is no different for TDAP. |
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