Quantitative assessment of tree species diversity from representative sample plots of three forest ranges of Nayagarh Forest Division of Odisha, India was made. Sixty six (66) transects (1000 m X 5 m) were laid in Nayagarh (20 nos), Dasapalla (20 nos.) and Mahipur (26 nos.) forest ranges for enumeration of the tree species having ≥ 30 cm GBH. A total of 162 tree species belonging to 115 genera under 44 families were recorded. Maximum of 128 tree species from Nayagarh, 119 species from Mahipur and minimum of 89 species from Daspalla range were enumerated. Shorea robusta, Buchanania lanzan, Lannea coromandelica, Terminalia alata and Cleistanthus collinus were the predominant tree species of the study area. The families Rubiaceae, Euphorbiaceae, Fabaceae, Moraceae and Mimosaceae were found to contribute to maximum species richness, stand density and basal area. The stem density varied in the range of 466.54 stem ha”1 in Dasapalla range to 530.30 stem ha”1 in Nayagarh range. The stand basal area was maximum (31.62 m2 ha”1) in Dasapalla range followed by Mahipur (17.13 m2 ha”1) and Nayagarh (13.16 m2 ha”1). However, highest value of Shannon-Weiner Index (3.61) was recorded for Nayagarh range and lowest (3.51) for Manipur forest range. The tree density and species richness decreased with increasing girth class. Highest number of species and maximum density was recorded for 30-60 cm girth class in all the three forest ranges.
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