Within the Binh Tri Thien coastal zone, 32 units of vegetation were classified and described on structures. At first, it was classified as natural or artificial. Within the natural vegetation, it was continue classified into tropical and subtropical groups. Tropical vegetation of the study areas were under 900m of elevation with the hot, humid bioclimatic. The tropical vegetation on the zonal soil and on sandstone, granite, schist included closed broad-leaf evergreen forest, secondary scrub and grass land, bamboo forest. The tropical vegetation on the red basalt soil contented secondary broad-leaf forest, scrub and grass land. The tropical vegetation on the azonic soil included the woods on gravelly soil of Melaleuca leucadendron and the secondary scrub and grass land on limestone, hard leaves woods on the sand, the secondary scrubs on red sand, dark yellow sand, light grey sand, yellow grey sand and the grassland on red sand, dark yellow sand, light grey sand and yellow grey sand. The tropical vegetation on the intraoral soil included fresh water and marine. With the fresh water vegetation, it included aquatic marsh on the alluvial humus, aquatic and sunk scrubs or grass land, aquatic plant community, marsh on peat mixed sand, woods of Melaleuca leucadendron on the peat, secondary scrubs and grass land on wet sand and last one was aquatic plant community in peat lagoon. The marine vegetation included mangrove forest, marine secondary scrubs and grass land, grass land on the beach, marine plant community and woods on the rocky beach.
The subtropical zone (elevation over 900m) with the cool and humid bioclimatic included subtropical closed broad leaves and needle leaves mixed evergreen forest, the special formation at the mountaintop and last on of secondary scrub. And the 5 last units were artificial vegetation that included annual agricultural plants, perennial industrial crops, plantation forest, community of cultivated plants in the residential area, and other area where opened plants covered.
Nguyen Huu Tu - Vu Anh Tai
Institute of Geography - VAST
(Proceedings of 3rd National Scientific Conference on Ecology and Biological Resources, Hanoi 22th October 2009 - IEBR)