Studying on planktonic algae and characteristics of water quality of some small and adlittoral artificial Lake in the city zone

Planktonic algae of some small eutrophic and adlittoral artificial Lake in the city zone of Guangzhou and their water quality were studied in July 2005 to February 2006. Fifty-four species in seven phylums of planktonic algae was indentified,which mainly consisted of Chlorophyceae,Cyanobacteria,acillariophyta and Euglenophyta.The dominant species was Chlorococcale,which consisted 26 phylums ,62 species,and 45.6 percent of total algae species. Overall,the mean total cell number in the lake was high. In February 2005,it reached to 10.8×106 cell mL-1; Base on the Kolkwitz water quality system,the species of planktonic algae which belong to α、β-middle pollution zone are the most. And water quality is evaluated by Margalef index standard and TSI which bases on amended Carlsoon Index . The result indicated that the water was eutrophic with Mid-High Pollution. The level of water be polluted which changed with season was evident: WinterAutumn Summer.