Some Ecological Characteristics and Vegetation Structure in the Distribution Area of Panax Stipuleanatus in Hoang Lien Mountain Range

Panax stipuleanatus, a precious genetic resource, is classified as Critically Endangered (CR) in the Vietnam Red Data Book 2007 and group IIa of Decree 32-CP. It species high economic value that being severely reduced many individuals mangrove plant communities needs to be studied preserved. A number biological ecological characteristics vegetation structures distribution area this have been determined. Specifically, ambient temperature ranges from 4.9-25.5oC; humidity about 70-92%, rainfall 26-780 mm sunshine hours 92-230 hours, soil with pH 3.97; Total K2O 9.10(g/kg), Fe+2 27.24 (g/kg), total P 0.33%; N 0.28% organic carbon 4.97%. stipuleanatus discovered under canopy mixed subtropical broadleaf trees an altitude 1.300-1.800m, slope 12-16%, where density 1.460 trees/ha, including importance index > 5%, such Castanopsissp, LinderacaudataHook.f., Lithocarpusfordianus (Hemsl.) Chun, Schefflerapauciffora R. Vig., Schimawallichi (DC.) Korth Prunusarborea Blume. These are considered important data on biology specific Panaxstipuleanatus, which foundation for researching, developing, proposing preservation solutions, exploiting, promoting rare resource Vietnam.