Species Composition and Vegetation Structure in Natural Park PT Badak LNG, Bontang, East Kalimantan

Abstract

ABSTRACT Forest ecological studies in Natural Park PT Badak Bontang, East Kalimantan has been carried out with the transect method. Vegetation observation was done on the transect line made by plot size 20 x 20 meter, and the distance between the plots is 100 meters. This study would be covered on species composition and species importance values. The forest structure could be seen from diameter and height stem classes, where commonly have been still some big tree with diameter > 100 cm and height 50 m tall. Meranti types are the main types of community constituents. These species include Shorea daspyphylia, S.hemsleyana, S. gibbosa, S. kunstteri, S.leprosula, S. macroptera, S.ovalis, S.parvifolia, S.pinanga, S.johorensis, S.ovata, S. pauciflora, S.pubistyla, S.seminis. Based on the Species Importance Value-s index rankings, respectively, Anthocephalus sp. with a value of 27.03, followed by S. kunsteri of 16.59, Memecylon borneensis of 15.78, S. alutaceae of 14.77, Syzygium sp. of 14.138 and Ficus sp. of 10.55. In the seedling, the level is dominated by pioneer types such as Syzygium spp., Litsea spp., Memecylon borneensis, Syzygium spp., Litsea spp. The kind of Dipterocarpaceae seedling is scarce. The type of Dipterocarpaceae seedling is short. The regeneration failure of these Dipterocarpaceae species in the future will alter the structure and composition of the plant species and is driven by the dominance of seedlings of pioneer groups.