Abstract
The present study aims to evaluate the present status of plant species diversity in the road dividers of Dhaka city. A total of 90 plant species under 73 genera and 42 families have been recorded from the road dividers of Dhaka city. Analysis showed that among the 90 species, the most abundant plant species in the road divider are Mimusops elengi (Bakul) Polyalthia longifolia (Debdaru), Leucaena leucocephala (Epil-epil), Tabernaemontana divaricata (Togor) and Swietenia mahagoni (Mahagoni). In case of dominant analysis based important value index showed that Mimusops elengi is the top dominant plant species followed by Polyalthia longifolia, Leucaena leucocephala, Tabernaemontana divaricata and Swietenia mahagoni respectively. These plant species have also showed the higher relative density, relative frequency and relative abundance. The percentage of native and exotic species was found here 44% and 56%, respectively. Most abundant and dominant plant species in the road dividers are exotics including Mimusops elengi,Polyalthia longifolia, Leucaena leucocephala and Swietenia mahagoni. Species diversity value was found higher in Hatirjeel site whereas lowest in Baridhara- Badda site. A number of recommendations are made based on the present results for the management of plant species diversity in the road dividers of Dhaka city. Some recommended native plant species for plantation according to the width and soil depth in the road dividers are Cassia fistula, Holarrhena pubescens, Firmiana colorata, Shorea robusta, Miliusa valutina, Butea monosperma, Alstonia scholaris, Toona ciliata, Ficus racemosa, Bombax ceiba, Woodfordia fruticosa, Melastoma malabathricum, Sterculia villosa, Grewia microcos, Syzygium cumini, Tabernaemontana divaricata, Ixora coccinea, Terminalia bellirica, Terminalia arjuna and also native seasonal flowers.
 Bangladesh J. Plant Taxon. 28(1): 141-154, 2021 (June)
Highlights
Plant species diversity of urban areas has received considerable attention in the last few decades (Sukopp, 1990) and urban green spaces are being considered critical for biodiversity conservation (Aronson et al, 2017)
The results of present evaluation of plant species diversity recorded from the road dividers of Dhaka city provides a basis for future management plan
Apart from these, Acacia auriculiformis, Dalbergia sissoo, Delonix regia, Eucalyptus camaldulensis, Peltophorum pterocarpum and Terminalia catappa are observed on the road dividers
Summary
Plant species diversity of urban areas has received considerable attention in the last few decades (Sukopp, 1990) and urban green spaces are being considered critical for biodiversity conservation (Aronson et al, 2017). The noteworthy works are Datta and Mitra (1953); Alam (1967); Hossain (1966); Hossain (2006); Huq and Begum (1984); Hussain (1965); Khan and Huq (1981); Rahman (1966); Zeauddin (1967); Hossain and Uddin (2011); Uddin and Hassan (2016) and Uddin et al(2019) All these works were covered the list of plants species or list of plant species of particular families or groups. No works covered the abundance of urban plant species diversity of road dividers in Dhaka city. Attempt has been made with the following objectives: to make an inventory of plant species diversity in the road dividers of Dhaka city; to determine the dominant plant species in the road dividers; to confirm whether the dominant species are native or exotics; to measure plant species diversity; to make recommendations for better management of plant diversity in Dhaka city
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