FLORA DIVERSITY IN THAC TIEN – DEO GIO NATURAL FOREST OF XIN MAN DISTRICT, HA GIANG PROVINCE

Abstract

This article presents the results of a research on flora of Thac Tien - Deo Gio natural forest, Ha Giang province. The research showed that the flora of the Thac Tien - Deo Gio natural forest is rather diverse, and there are 766 species of 435 genera in 148 families belonging to 6 divisions of vascular plants. Among them, the Angiospermae is the most dominant with 693 species (90.47%), 391 genera (89.89%), and 121 families (81.76%); the next Polypodiophyta with 63 species (8.22%), 38 genera (8.74%), 22 families (14.86%); the Lycopodiophyta with 6 species (0.78%), 3 genera (0.69%), 2 families (1.35%); the Psilototphyta with 2 species (0.26%), 1 genera (0.23%), 1 families (0.68%); the two last Gymnospermae and Equisetophyta with 1 species (0.13%), 1 genus (0.23%), 1 family (0.68%). In the Angiospermae, the Dicotyledonae is dominant. The ratio of Dicotyledonae to Monocotyledonae is 6.62 for species, 5.41 for genera, and 5.05 for families. There are 257 plant species in the 10 most diverse families, representing for 33.55% of the total species numbers and 110 plant species in the 13 most diverse genera, representing for 14.36% of the total species numbers in the study area. The forest plant resources of the Thac Tien - Deo Gio area is rather diverse. There are 608 useful plant species, representing for 75.91% of the total species numbers recorded, can be classified by 15 different useful groups.