Natural Environment Monitoring 2012, No 13, 81-84
FREQUENCY OF SAMPLING IN LAKE TROPHY ESTIMATION BASED ON TSI INDICES
Tomasz Lenard, Wojciech Ejankowski
Variations of biological and chemical parameters within and between years can affect negatively on lake quality assessment. The aim of this work was to determine the sampling frequency in the estimation of lake trophy using Trophic State Indices (TSI). TSI indices were calculated based on chlorophyll-a concentration, water transparency, total phosphorus and total nitrogen concentrations. Some options of data collection were taken into consideration. The results suggest, that sampling during two years, versus one year, ensure adequately trophy estimation. The most effective choice of the study terms should consider at least two-year period, even if only one sample will be taken every year.