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Composition and Diversity of Tree Species in Moulvibazar Natural Forests of Sylhet Forest Division, Bangladesh.

M. Rafiqul Haider
Divisional Officer
Bangladesh Forest Research Institute

M. Mahfuzur Rahman
Professor
Department of Botany, jahangirnagar University, Savar, Dhaka

Abul Khair
Professor
Department of Botany, jahangirnagar University, Savar, Dhaka

S. M. Zahirul Islam
Reseach Officer
Bangladesh Forest Research Institute

Abstract/ Executive Summary:

The composition and diversity of native tree species of Moulvibazar natural forests of Sylhet Forest Division were investigated. A total of 1,051 individual stems having dbh of >5 cm were recorded from 1.44 ha sampled area. These comprise 81 native tree species belonging to 59 genera under 33 families. Moraceae and Euphorbiaceae dominated in the study area containing 9 and 8 species respectively followed by Rubiaceae (7), Myrtaceae and Verbenaceae (6 species each). Average species diversity was 3.40 and ranged from 3.21-3.61 in the study area. Species similarity index was highest (69.72%) between Lawachara and Adampur followed by Adampur and Gobindpur (65.4%) and lowest (62.7%) between Lawachara and Gobindpur. Tree density was found 573 stems ha-¹ in Lawachara, 860 stem ha-¹ in Adampur (Kalengi) and 756 stems ha-¹ in Gobindpur. Artocarpus chama showed the highest (32.63 m²) basal area in Lawachara followed by Lagerstroemia parviflora (6.98 m²) and Chukrasia velutina (5.74 m²), but in Adampur maximum basal area showed by Syzygium firmum (2.39 m² ) and followed by Artocarpus chama (2.04 m²) , Castanopsis tribuloides (1.24m²), while in Gobindpur, maximum basal area recorded for Elaeocarpus varunna (1.31m²) followed by Artocarpus chama (2.04m²) and Vitex pubescens (0.82m²). Highest Important Value Index (IVI) in Lawachara natural forests was 86.92 for Artocarpus chama followed by Lagerstroemia parviflora (29.53), Chukrasia velutina (15.11), but in Adampur Syzygium firmum attains the highest IVI (39.92) followed by Castanopsis tribuloides (17.62), Artocarpus chama (17.46), Lagerstroemia parviflora (15.62) and Elaeocarpus varunna (15.41), while in Gobindpur, the highest IVI was recorded for Elaeocarpus varunna (22.32) followed by Vitex pubescens (15.06) and Syzygium formosum (14.71).

Keywords: Basal area, Composition, Diversity, Importance value index

Location: Moulvibazar Natural Forest, Sylhet Forest Division

Start Date: 00-11-2010

End Date: 00-01-2011

Program Area: Conservation and Biodiversity

Commodity: Management

Objectives:

a) To provide information on tree species diversity and composition of Moulvibazar natural forests.

Methodology:

The study was conducted in Lawachara, Adampur (Kalengi) and Sree-Gobindapur natural forests of Moulvibazar district. Lawachara National Park (LNP) a well known protected area (1250 ha) of West Banugach reserved was handed over to private ownership in 1980’s through lease and now is under the control of Sree-Gobindapur tea estate and gradually converted the forest into tea garden except the remaining of 300 ha forest area. The floristic composition of tree species in the study area was enumerated through random sampling method during November 2010- January 2011. We selected 36 sample plots of 20m X 20m and plot size was determined by applying species area curve method. Trees number having dbh >5 cm and above (over bark) measured and recorded. Basal area, relative frequency, relative dominance, relative abundance and finally Importance Value Index (IVI) were calculated. Species similarity and Shanon Weiner's index were calculated. The collected samples were compared with voucher specimens preserved in the Herbarium of Bangladesh Forest Research Institute, Chittagong and National Herbarium, Dhaka.

Source of Information: Bangladesh Journal of Forest Science Vol.32 (2): 49-60, 2013

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Natural forests of Moulvibazar districts are heterogeneous in composition and diversity. Information on occurrence and composition of trees species in this forest is inadequate. The present findings provide valuable information on tree species distribution and their relative dominance which will helpful for the future conservation and management plan of that area.

Knowledge Management: Journal