In the special used forest of the Yen Tu belonging to Quang Ninh province, there are 4 divisions of higher vascular plants (Lycopodiophyta, Polypodiophyta, Gymnospermae and Angiospermae) with 711 registered species, 427 genera and 154 families. Among them, the Angiospermae is dominant with 670 species, 398 genera and 133 families; the Polypodiophyta with 28 species, 19 genera, 15 families; the Gymnospermae with 8 species, 7 genera, 4 families and lastly the Lycopodiophyta with 5 species, 3 genera, 2 families. In the Angiospermae, the Dicotyledonae is dominant. The ratio of Dicotyledonae to Monocotyledonae is 6.2 for species, 5.86 for genera and 4.78 for families. The ten most richest in number of species families (254 species), represent 35.98% of the registered species in the Yen Tu. The ten most richest in number of species genera represent 2.36% of the registered genera and 22.11% of the registered species (79 species) in this region.
Regarding to plant-forms, in the Yen Tu special used forest there is the presence of all the plant-forms, but the dominant group is the Phanerophytes (Ph) with 84.29% of the total of registered species.
Regarding uses, there are 547 useful species including in 12 useful groups, represent 76.93% of the total of registered species.
In the Yen Tu forest, there are 20 threatened species listed in the Red Data Book of Viet Nam (1996), 6 species in Decree 32/2006/NĐ-CP by Government.
MSc. Phung Van Phe
Vietnam Forestry University
Ass.Prof. Dr. Tran Minh Hoi
IEBR
Dr. Nguyen Trung Thanh
Hanoi, National University
BSc. Nguyen Thi Han
Luong Tai High School, No2, Department of Education and Training of Bac Ninh province
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