2014, VOLUME 1 ISSUE 2Pages: 26-36
Assessment of diversity, population structure and regeneration status of tree species in Hollongapar Gibbon Wildlife Sanctuary, Assam, Northeast India
Moumita Sarkar and Ashalata Dev*
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The present study was carried out for quantitative analysis of diversity, population structure and regeneration status of tree species in tropical semi-evergreen forest of Hollongapar Gibbon Wildlife Sanctuary, Assam, northeast India. The study was conducted during 2010-2011, by laying 100 quadrats (10×10 m) following random plot sampling method. A total of 75 tree species (≥30 cm gbh), belonging to 60 genera and 40 families were recorded from the study area. Individuals were categorized into three groups, seedling, sapling and adult based on girth classes and the status of natural regeneration of species was determined based on their population size. Highest density (7756 individuals.ha-¹) and species richness (73) were recorded in 0-30 cm girth class, while highest basal area (9.62 m².ha-¹) was observed in 120-150 cm girth class. Majority of tree species (36%) exhibited ‘fair regeneration’ condition followed by ‘good regeneration’ status (24%). The overall population structure of tree species shows a reverse J-shaped population curve and ‘good’ regeneration status which reveals that the future communities may be sustained. The study gives an understanding of the diversity, pattern of population and regeneration of the tree species of the sanctuary which may help in forest management and conservation of the species.
Fig.: Map of the study site.