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Study on Relationship between Cyanobacteria Blooms and Chemical Biological Factors in a Shallow Temperate Zone Lake

A 4-month data set was used to investigate historical changes between the number of the Cyanobacteria and concentrations of total nitrogen (TN), total phosphorus (TP), TN:TP, chemical oxygen dawdling (COD), NO3, pH and Chl-a in a shallow temperate zone lake (Guishui Lake, Beijing, China). The aim was to evaluate changes in the risk of Cyanobacteria blooms, which have occurred several times in the lake every year. Observe that high ratios of total TN:TP ( ≫ 20), and low concentration of TP (