STRUCTURAL CHARACTERISTICS OF TREE LAYER AND REGENERATIVE TREES WITH Eurycoma longifolia DISTRIBUTION IN THE SOUTH CENTRAL COAST AND CENTRAL HIGHLANDS

Abstract

Eurycoma longifolia has a wide ecological amplitude, distribution throughout most forest states in South
Central Coast and Central Highlands, with an average tree density of 18 to 26 trees per hectare, an average
diameter of 7.3 to 7.9 cm, an average height of 7.9 to 8.7 m, and a reserve of 0.1 to 2.2 m
3
/ha. Eurycoma
longifolia participating in the high tree strata accounted for 46.7% - 80.0% of the investigated stands, with the
composition coefficient from 5.1 to 13.9%. Each examined stand has an average of 13 regenerated tree
species, ranging from 11.6 to 14.0 species. The E. longifolia participating in the regeneration plants accounted
for 46.7 - 66.7% of the investigated stands, with a composition coefficient of 0.7 - 2.4%. The majority of tree
species that regenerate have little economic worth. As a result, in order to create higher quality natural forest
statuses in the study areas in the near future, it will be necessary to modify the nests for tree species that
regenerate in order to encourage some regenerative tree species with high economic value in the conservation
of species like Lithocarpus ducampii, Pygeum arboreum, Paramichelia braianensis, Shorea roxburghii,
Dipterocarpus alatus, Dipterocarpus obtusifolius,..