Assessment of Current Plant Diversity in Phia Oac - Phia Den Nature Reserve, Nguyen Binh District, Cao Bang Province, Vietnam

Our preliminary study on plant diversity in Phia Oac - Phia Den Nature Reserve identified 1199 species, belonging to 611 genera, 177 families and five phylums. Among them, Magnoliophyta is the most species phylum with 939 species (accounting for 78.31% of the total species), belonging to 520 genera (85.11% ), and 144 families (81.36%). Nine dominant families contain 371 species (30.94%), belonging to 167 genera (27.33%). The main life form of plants in surveyed area is Phanerophytes (Ph) with 644 species (53.71% of total species). Plants are mainly distributed in the primary forest ecosystem of Phia Oac - Phia Den Nature Reserve (575 species or 47.79%). There are 1060 useful plant species with medicinal plants and timber trees making up the largest proportion of 40.37% and 19.77%, respectively.