The study looked at the Chlorophyll a levels in Dianchi Lake over five years. They found that Chlorophyll a concentration is highest in summer and lowest in winter. The levels are higher in the north and west parts of the lake. Factors like temperature, nitrogen levels, and pH affect Chlorophyll a concentration. The researchers found a negative correlation with suspended solids but a positive correlation with pH and temperature. The average Chlorophyll a concentration can be predicted using a formula that includes water temperature, total nitrogen, and pH.