Abstract:

Based to the monthly monitoring data of monitoring points in the Dianchi lake and the Taihu lake,analysis of pollutions with lake water at the same time in different geographical situation was comparatively studied,and the correlation between water quality of surface water and biochemical characters of cyanobacterial biomass was assessed.The results revealed that the degree of eutrophication in the Dianchi Lake was higher than that of the Taihu Lake during monitoring.Water quality index in the Dianchi lake showed increasereduceincrease,and was highest in June.While the water quality index in the Taihu lake showed a rising trend monthly.The content of kjeldahl nitrogen,total phosphorous and the total nutrients (N+P2O5+K2O) of the Dianchi Lake cyanobacteria biomass was same as the Taihu Lake,but the C/N was higher than the Taihu Lake.The content of the heavy metal elements in the various samples levels were lower than the organic fertilizer industry standards (NY5252011) except for As and Cd.Correlation analysis showed that lead and chromium of cyanobacteria biomass had significant homology.In addition,the content of ammonium nitrogen in surface water could be used as the extent indicator of eutrophication