A study on the presence of macrophytes in relation to physicochemical parameters in Diplai Beel water of Kokrajhar District, BTAD, Assam.

Physicochemical properties of water play a major role in determining the occurrence of hydrophytes in a fresh water ecosystem. Presence of minor macrophytes species is investigated in relation to physicochemical parameters of Diplai Beel water such as temperature, pH, dissolved oxygen (DO), BOD, turbidity, electrical conductivity (EC), total dissolved solid (TDS), odour and colour. The study is carried out during the period of Pre-monsoon (March-May, 2015), Monsoon (June-August, 2015), Post-monsoon (September-November, 2015) and Winter (December-February, 2016) in 2015–16. The periodic changes of the physicochemical parameters in the studied water show vital role in the abundance of macrophytes. It is observed that minor species of macrophytes such as Lemna perpusilla, Lemna minor, Spirodela polyrrhyza, Pistia stratiotes, Azolla pinnata(fern), Salvania natans(fern) have been influenced more and reflected their variations in presence and number in different study periods of the year. The studied water parameters have great influence in water qualities. Lastly reasons of variation and stress are discussed.