The diversity of Trees in Roadside Greenbelt in Jakarta

Abstract

Trees inroadside greenbelt were inventoried in 2008 by The Park and Public Funeral Agency of Jakarta Province Government in order to develop a trees database of green open space in Jakarta. Number of trees was observed in 113 main roads at 5 administration regions ofJakarta. Observed road consist of 23 roads in central Jakarta, 24 roads in North Jakarta, 22 roads in south Jakarta, 22 roads in West Jakarta, and 23 roads in East Jakarta. Data collection was limited to all trees that exist in right of way area that included trees in pedestrian paths, median and road separators. Physical attributes of these trees were observed include of name of the trees, caliper, tree height and width of canopy. The results of these observation shows that in the most of roads, trees were found in one row in places such as road shoulders, road separators and road median. However more than one row of trees was found in several roads that have a wide median or road shoulder. The observation of 113 roads shows trees in roadside greenbelt in Jakarta consisted of wide varieties. Totally 25,701 trees were fouod, and at least 119 species of trees were recorded. However among of the species, 79% of population was dominated by the next 10 species: Swietenia macrophylla, Pterocarpus indicus, Mimusops elengi, Polyathia Jragrans. Cerbera manghas, Ficus benjamina, Diallium indum, Roystonea regia, Polyalthia longifiloa and Bauhinia purpurea. Most of roads were planted with more than on single species. The number of tree species in each roads observed ranged from I - 26 species in Central Jakarta, 1- 49 species in West Jakarta, 1-36 species in North Jakarta, 1-37 species in East Jakarta, and ranged from 3-34 species in South Jakarta. The diversity of tree species in roadside greenbelt in Jakarta enhanced the functions of planting in creating a comfortable and beautiful road for its surrounding.