Comparison on the Eastern Asia and Northern America Geographical Composition of Seed Plants in Sanqingshan Mountain,Jiangxi Province

Based on field survey and classification processing,analysis on the flora of Eastern Asia and Northern America geographical composition of seed plants in Sanqingshan Mountain,it compared with the compositions of the seven geographic region within China. the result shows: There are 75 genera of Eastern Asia and Northern America disjunctive distribution of seed plants in Sanqingshan Mountain,belong to 43 families,157 species( including varietas,forma and subspecies). which occupies 9. 28% of the total families,26. 71% of the total genera and 8. 55% of the total species of seed plants in Sanqingshan Mountain. 61. 98% of the total genera of the Areal-type of seed plants in China. The flora composition is rich,the genera of less species( one to five species) is the most important,accounting for 90. 67% in total genera. The xylophyta are mainly distributed in Eastern Asia,herbaceous plants is more in Northern America. The distribution pattern of vertical gradient change is a up and down low,middle high. It is the most closely related with the flora of mountains in East China and Central China,the most distant with the flora of mountains in Northwest China. The compositions are distributed the region mainly over north of Nanling Mt.,south of Qinling Mt.,east of Dabashan Mt. or Xuefeng Mt. or Wushan Mt.,Sanqingshan Mt. is one center of Eastern Asia-Northern America discontinuous distribution in China.