Species composition and vegetation structure of lowland forest in Rambut Island Wildlife Reserve, Kepulauan Seribu, DKI Jakarta

Abstract

Lowland forest needs to be studied for its structure and composition because it has high biodiversity. Vegetation analysis aims to determine the species composition and structures of lowland forest vegetation in Rambut Island Wildlife Reserve. Vegetation analysis was carried out by the stripes and plotted lines with an observed area of 20,000 m2 with several ten lines of observation with an area of 20x100 m. The vegetation data obtained were processed to obtain the Importance Value Index (IVI), the Plant Species Diversity Index, the Species Dominance Index, the Species Richness Index and the Species Evenness Index. Retrieval of abiotic data such as light intensity, altitude, slope, wet and dry temperature, relative humidity, soil pH, soil cation exchange capacity, and soil texture. There are 15 types of plant species in the research location. Kedoya dominates at the tree level, mengkudu dominates at the pole level, kingkit dominates at the sapling level, and kedoya dominates at the seedling level. The highest density value is found at the seedling growth rate of 900 500 individuals ha-1 resulting in an inverted "J"curve in both vertical and horizontal structures.