ĐẶC ĐIỂM PHÂN HÓA THẢM THỰC VẬT RỪNG HỖN GIAO LÁ RỘNG, LÁ KIM VƯỜN QUỐC GIA BIDOUP - NÚI BÀ

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DIFFERENTIATION CHARACTERISTICS OF MIXED BROAD, NEEDLE LEAF FOREST TYPE IN BIDOUP - NUIBA NATIONAL PARK

The mixed broad, needle leaf forest is typical point of Bidoup - Nui Ba flora. With an area of ​​10,371.3 hectares, the forest is widely distributed over the elevation, from subtropical medium mountain belt (< 1,700 m) to subtropical high mountain belt (> 1,700 m). The forest’s a diverse compositional structure of a mixed rate of 1/15, He’ is 4.34, Cd of 0.02 and a multi-storied structure, with decreasing N/D distribution. With 144 species of tree trunks, belonging to 38 families, the high-altitude tree formulas have 3-9 participating species. The density of natural regenerated trees is high, with an average of 31,152 trees/ha, the density of prospect regenerated trees is 3,652 trees/ha. Between layers of tall trees - Prospect regeneration trees and Small regenerated trees, number of species tend to decrease and gradually increase in density, respectively. The following elevation belt, vegetation communities of mixed broadleaf, coniferous changed significantly in structure. The subtropical high mountain belt has higher tree species diversity, but the density and layer structure (2-3 stratiform layers) and indicators D_1.3tb, H_vntb, natural regeneration density were lower than the subtropical medium mountain belt. The number and species composition of two elevation belts has difference between tree layers, except for some species: Pinus krempfii, Lythocarpus annamensis, Craibiodendron bidoupensis, Syzygium zeylanicum...