Analysis on geographical compositions of seed plants flora at family and generic levels in Daliangzihe national forest park

Based on field investigation and statistical data,The paper reported 454 species of seed plant which belong to 73 families,245 genera in Daliangzihe national forest park in Heilongjiang province of China.There were 1 family,4 genera,7 species of gymnosperms and 72 families,241 genera,447 species of seed plant.According to family distribution type,6 distribution types were divided.There were Cosmopolitan type 22 families,114 genera and 212 species,tropical type including 26 families,46 genera and 80 species,and temperate type including 25 families,85 genera and 162 species.From the family geographical elements,the distributional type of families with temperate zone character was main body of flora in the park;Genera geographical elements was complex and was divided into 13 types,and the temperate elements holding absolute predominance,with 178 genera of temperate elements,accounting for 86.41% of the total genus,and also were the main geographical elements of seed plant flora in this national forest park.