Analysis on floristic elements and feature of typical groups of seed plant in Nanyue(Hengshan Mountain)

The floristic composition,typical groups and their correlations analysis of seed plant in Nanyue,Hengshan Mountain were studied with the method of combination of data access and thematic surveys and specimen identification.The results were showed: There are 1 572 species to belong to 692 genera to belong to 164 families on the wild seed plant occupying 94.15% of genera and 57.41% of species of middle subtropical ever-green wild-leaved forest of China.There are 66 dominant genera,22 dominant families,75 character genera,38 character families in the seed plant floristic and 49 dominant genera and 25 dominant families in the vegetation.The distribution type of seed plant floristic with a VFEC higher than average value and more than 10 species in it was similar to the actual distribution type of it.4.The correspond similarity coefficient of dominant,characteristic family and dominant family of the vegetation held 1.56%~47.06% and that of dominant,characteristic genera and dominant genera of the vegetation held 0.80%~30.36%.The characteristic genera and family should be defined in the genera or family with more than ten species and a VFIC higher than mean.The dominant family(genera),the characteristic family(genera)and the dominant family(genera)of vegetation were three independent ecological index of floristic.