Research was conducted in Bidoup-Nui Ba National Park, where Pinus krempfii distributes to evaluate the natural regeneration of this tree species. Results showed that Pinus krempfii is dominant tree species that distributes in mixed forest of coniferous and broadleaf trees in the study area. The average density of timber tree is 896 trees/ha, forest canopy has multiple layers with canopy cover reachs over 0.7. Pinus krempfii has not appeared in regeneration tree composition. For regeneration tree composition, Lithocarpus pseudosundaicus has the highest value (0.96), then Elaeocarpus apiculatus (0.76), Castano psis echidnocarpa (0.68), Syzygium zeylanicum (0.52), Syzygium lineatum (0.50) and the remaining 42 species (6.57). Tree regeneration density is relatively high from 3,750 to 6,750 trees/ha, average 5,718 trees/ha with the average 54.4 percent of good tree. Density of regeneration tree of Pinus krempfii is from 166 to 292 trees/ha, average 250 trees/ha. This is a relatively high density, however prospect regeneration tree (with height of above 2 m) rate is very low. Regeneration trees decline severly when trees getting higher and have clumped distribution (cluster). High canopy coverage, the growth of shrubs, and litter thickness can cause stunted in the growth of regeneration tree. Topography and human activities such as digging regeneration trees for ornamental purpose also are the factors affecting the growth arid viability of Pinus krempfiiregeneration trees in the study area.
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