Plant Species Composition and Structure of Some Selected Area of Dhaka North City Corporation (DNCC)

Abstract

The present study was conducted to assess the composition and structure and to identify the vegetation status of different plant species in Dhaka North City Corporation (DNCC) of some selected areas. The study was conducted from 1 January 2017 to 31 March 2017. Data was collected from three habitat category (Parks, gardens and roads) in DNCC. The study areas were Chandrima, Uddan, Botanical Garden, Rokeya Sarani, Mirpur -2 Road and Zoo Road. In this study, tree species and total number were found at the Chandrima Uddan, Rokeya Sarani, Mirpur -2 Road, Zoo Road and Botanical Garden were 18 and 226, 12 and 85, 11 and 60, 2 and 276 and 13 and 621 respectively. Similarly, Shrub species and total number were found at the Chandrima Uddan, Rokeya Soroni, Mirpur -2 Road, Zoo Road and Botanical Garden were 11 and 214, 5 and 386, 7 and 758, 0 & 0 and 9 and 1165, respectively. Herb species and total number were found at the Chandrima Uddan, Rokeya Sarani, Mirpur -2 Road, Zoo Road and Botanical Garden were 3 and 370, 0 and 0, 0 and 0, 0 and 0 and 5 and 146 respectively. Results found that at Chandrima Uddan the highest number of plant was found in Acacia auriculiformis (44) followed by Borassus flabellifer (39) and the lowest number was found in Samanea saman (3) and Delonix regia (3), at Rokeya Sarani the highest number of plant was found in Swietenia macrophylla (40) and the lowest number was found in Azadirachta indica (1), at Mirpur-2 road the highest number of plant was found in Mimusops elengi (15) and the lowest number was found in Dalbergia sissoo (1), at the Zoo road the highest number of plant was found in Swietenia macrophylla (264) and the lowest number was found in Arecaceae palmae (12) and the highest number of plant was found in Polyalthia longifolia (165) and the lowest number was found in Arecaceae palmae (6) and Pennisetum glaucum (6) at Botanical Garden. In Height Class (in m) results found that the highest amount of tree individuals 117 was found at heights (8-16 m) and the lowest amount of tree individuals 40 was found at heights (16-24 m) at Chandrima Uddan, at Rokeya sarani the highest amount of tree individuals 47 was found at heights (1.6-8 m) and the lowest amount of tree individuals 1 was found at heights (16-24 m),at Mirpur-2 road the highest amount of tree individuals 46 was found at heights (1.6-8 m) and the lowest amount of tree individuals 14 was found at heights (8-16 m), at Zoo road the highest amount of tree individuals 184 was found at heights (8-16 m) and the lowest amount of tree individuals 0 was found at heights (<1.60 m) and the highest amount of tree individuals 202 was found at heights (8-16 m) and the lowest amount of tree individuals 40 was found at heights (1.6-40 m) at Botanical garden. For comparison among five study areas it was found that tree individual of Botanical garden had more height among all study areas. In DBH (cm) the highest amount of tree individuals 72 was found at heights (>100 cm) at Chandrima Uddan, at Rokeya Sarani the highest amount of tree individuals 13 was found in DBH class (31-40 cm), at Mirpur-2 road the highest amount of tree individuals 16 was found in DBH class (10-20 cm), at Zoo road the highest amount of tree individuals 31 was found in DBH class (61-70 cm) and the highest amount of tree individuals 503 was found in DBH class (>100 cm) at Botanical garden. For comparison among five study areas it was found that tree individual of Botanical garden had more diameter at breast height (dbh) among all study area.