<![CDATA[Plant ecology study has been conducted in the southern part of Rinjani Mountain National Park on April 2015 to determinethe structure and composition of tree species. Four plots, 30 x 30 m each were established at four locations, those are; Pal-Belanda (1046 m asl), Pengorot-1 (929 m asl), Pengorot-2 (820 m asl), and Sebau (1134 m asl). The results showed thatthere are two types of forest in the sites, namely the secondary forest (Pal-Belanda, Pengorot-1 and Pengorot-2) and primaryforest (Sebau). From all plots (0.36 ha) we found 36 species of trees (trunk diameter > 5 cm) of 449 individuals, 28 genusand 21 families with a total Basal Area of 16.73 m2 (46.47 m2/ha). Shannon Diversity Index (H) in the Pengorot-2 recorded1,15, followed Pengorot-1 (1.13), Pal-Belanda (1.03) and Sebau (0.72). Saurauia pendula recorded as the dominant speciesin all site with Important Value Species (IVS) of 245% followed Dendrocnide microstigma (IVS = 162%), Platea excelsa(IVS=148.2%), Syzygium glomeruliferum (IVS=72%) and Symplocos cochinchinensis (IVS=49.3%). Myrtaceae andEuphorbiaceae were the common families in the sites. Structure and composition of tree species in the Pal-Belanda,Pengorot-1 and Pengorot-2 were relative similar (Similarity Index 70.3% and 69.4%) but different than in Sebau area(Similarity Index 24.9%).Keywords: Structure, composition, tree diversity, Rinjani, Lombok]]>
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