Authors : Kavita S. Raipurkar
Page Nos : 122-127
Description :
Trophic State index of Carlson (1977) is frequently used biomass related trophic state. It is relatively simple to use, requires a minimum of data and is generally easy to understand. Carlson’s trophic state index uses three variables, chlorophyll pigment (CHL), secchi disk depth (SD), and total phosphorus (TP), independently estimate algal biomass. The range of the index is from approximately zero to 100. For the current study, Carlson’s trophic state index for lake Junona was calculated in October- November 2014. For evaluating Carlson trophic state index, three variables i.e. TSI (SD) for secchi disk, TSI (CHL) for Chlorophyll a and TSI (TP) for total phosphorus were calculated individually. From the results it was found that trophic state index for secchi disk for Lake Junona was found to be 58.7305 which indicate the eutrophic condition of the lake. Trophic state index for chlorophyll a was found to be 93.82545 which indicate the hypereutophic condition. Trophic state index for total phosphorus was found to be 97.76 which again categories the lake into hypereutrophic state. By averaging these three indices Carlson trophic state index was estimated as 83.4386.Thus according to Carlson trophic state index Lake Junona can be categorized into hypereutrophic state.
