Characteristics of Algae Phytoplankton and Evaluation on the Trophic Status of Wapu Lake
The structure and amount of algae phytoplankton, water quality and nutrient status of Wapu lake were determined via qualitative and quantitative investigation of algae phytoplankton,chlorophyll-a(Chl-a) content and several physical and chemical indexes.The results showed that the phytoplankton community structure of Wapu lake was of a green-blue algae type, and dominant species include 8 species of Chlorophyta,4 species of Cyanophyta and 1 species of Bacillariophyta.The average cell density of samples was 4.623×10~5·L~(-1), while Chl-a was 14.28 mg·m~(-3);For chemical indexes,TP and TN value reached higher levels in all samples, and SD was lower. Based on the evaluation with Trophic Level Index (TLI) method, the water body of Wapu lake fell into a medium level of nutrition, which was near to light eutrophication, and show a tendency to be come worse.