Abstract
This study has confirmed the occurrence of a total of 181 species of vascular plants under 133 genera and 51 families and estimates the plant species diversity in and around the brickfield areas of Savar-Dhamrai region of Dhaka district. Of these, six species were pteridophytes, 175 were Angiosperms, and 144 species were economically important. Five families, composed of six species, belonged to Pteridophyta, 40 families, consist of 128 species, to Magnoliopsida (dicotyledons) and six families, comprised of 47 species, to Liliopsida (monocotyledons). Total of 161 species were herbs, 14 were shrubs, and only six were trees. Asteraceae with 14 species and Poaceae with 24 species were the largest family in Magnoliopsida and Liliopsida, respectively. Amaranthus L., Persicaria (L.) Mill., Solanum L. and Lindernia All. with four species each were appeared as the best representative genera in Mangoliopsida, while Cyperus L. with five species in Liliopsida. The species composition and diversity of abandoned brickfields were found to be higher than those of functional brickfields. A total of 42 (23.20%) species were common in both abandoned and functional brickfields of this region. Species composition in the abandoned brickfields of Savar and Dhamrai was mostly similar (64.15%). This study suggests to control and monitor the brickfields under the respective authorities to favor the formation and regeneration of natural vegetation in their neighboring areas.
 Jahangirnagar University J. Biol. Sci. 9(1 & 2): 91-108, 2020 (June & December)
Highlights
Biodiversity provides all basic ecosystem services, and many valuable components for sustainable development programs throughout the world
In the brickfields of Savar-Dhamrai region, the pteridophytes were represented by six species belonging to six genera and five families, the dicotyledons were composed of 128 species belonging to 96 genera and 40 families and the monocotyledons were consisted of 47 species belonging to 31 genera and six families
A total of 42 species were common in and around the abandoned- and functional brickfield areas of Savar-Dhamrai region. 11 species exclusively occurred in the abandoned brickfields of Savar and 19 in those of Dhamrai, whereas six species in the functional brickfields of both Savar and Dhamrai areas
Summary
Biodiversity provides all basic ecosystem services, and many valuable components for sustainable development programs throughout the world. This study was conducted to know the variation in floristic composition with regard to taxonomic enumeration and species diversity of vascular plants in and around the functional and abandoned brickfield areas of Savar-Dhamrai region.
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