Struktur dan Komposisi Jenis-Jenis Pohon di Taman Nasional Gunung Rinjani bagian Selatan, Lombok, Nusa Tenggara Barat

Abstract

Plant ecology study has been conducted in the southern part of Rinjani Mountain National Park on April 2015 to determine
the 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 that
there are two types of forest in the sites, namely the secondary forest (Pal-Belanda, Pengorot-1 and Pengorot-2) and primary
forest (Sebau). From all plots (0.36 ha) we found 36 species of trees (trunk diameter > 5 cm) of 449 individuals, 28 genus
and 21 families with a total Basal Area of 16.73 m2 (46.47 m2/ha). Shannon Diversity Index (H') in the Pengorot-2 recorded
1,15, followed Pengorot-1 (1.13), Pal-Belanda (1.03) and Sebau (0.72). Saurauia pendula recorded as the dominant species
in 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 and
Euphorbiaceae 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