[Study on associated plants and spatial distribution pattern of Dipsacus asperoides populations].

In order to understand the associated species and the population distribution pattern, the investigation of 32 sample plotsfrom the main natural distribution area in Dipsacus asperoides community was carried by quadrat method .The results showed that there were 156 species, which belong to 131 genera and 60 families. There were more species in the two dominant families, Asteraceae and Rosaceae. There were many types of associated, but most appeared at a low frequency. The vegetation type were mostly herbaceous and shrub species, which accounted for 77.6% of the total species. The value of t was greater than t0.05 by methods of variance/mean, showed the difference was significant and the distribution pattern of D. asperoides were cluster distribution. The determination results of seven aggregation intensity index also showed that D. asperoides population accorded with the characteristics of cluster distribution（C>1，K>0，Ca>0，m*>1，m*/m>1，I>0，GI>0）.