Tree species diversity and regeneration traits of the dominant species in a dipterocarp forest in Bangladesh: Implications for conservation

Abstract

Forests dominated by dipterocarps are one of the few remaining terrestrial areas with high biodiversity in Bangladesh. This study was conducted in a remnant dipterocarp forest reserve to identify tree species diversity in the reserve and key regeneration traits of the dominant species. Vegetation in transects and quadrats was measured, and regeneration traits (weight, length, diameter and dispersal distance) were investigated using seed trap experiments. We identified 66 tree species, belonging to 27 families and 45 genera with four clearly defined strata. Tree density was 384.05 ± 12.76 stems/ha and Dipterocarpus turbinatus alone contributed 23.45% to the total forest area. Trees in the intermediate diameter class (30.10-40.00 cm dbh) have high regeneration potential. We developed regression models to predict seed dispersal for different diameter classes. We found problems in recruitment for the dominant species. We suggest planting of native species to aid natural regeneration and for better management and conservation of biodiversity in the reserve. Similar management approaches may be applicable for other dipterocarp-dominated forests in Bangladesh.