The present study was conducted in Kapla beel to evaluate the macrophytic diversity of the wetland for a period of one year i.e. from October, 2013 to September, 2014. Kapla beel is a perennial freshwater wetland located at Barpeta district of western Assam at the global position between 260 15// N to 260 30// N latitude and 910 0// E to 910 15 E longitude. It covers an area of 91 hectares. Aquatic macrophytes were collected by using the methods as described by Raunkaier, (1934). During the present investigation total of 68 plant species belonging to 49 genus and 28 families were recorded from the wetland of the study site. The dominant family was Cyperaceae representing 12 species. Different diversity indices like Shannon-Weaver diversity index (Shannon and Weaver, 1964), Simpson diversity index (Simpson, 1949), Menhinick diversity index (Menhinick, 1965 ) and Concentration of dominance (Simpson, 1949) were calculated to show the plant communities structure of the wetland. Maximum values of Shannon- Weaver diversity index, Simpson diversity index and Menhinick diversity index were found during the summer season as it is active growth period of macrophytes whereas maximum concentration of dominance during the summer season reflects the dominance of few species due to high diversity of the macrophytes.
