Short-term distribution of chlorophyll-a concentration in summer at Guanting Reservoir
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Abstract:
Chlorophyll-a concentration at Guanting Reservoir in summer (August) were analyzed. The analysis has great significance to the study of reservoir water eutrophication. The data of water temperature, water depth, chlorophyll-a concentration, and meteorological data were measured at an interval of one minute, and were analyzed. The results showed that the maximum concentration of chlorophyll-a appeared at basically the same position as that of the thermocline, and it was 1.5-2 times of the surface concentration value. Chlorophyll-a concentration showed circadian variation. During daytime, chlorophyll-a concentration above the thermocline increased as water depth increased; yet below the thermocline, it decreased as water depth increased. At night, the chlorophyll-a concentration below the thermocline had the same variation trend as it had in the daytime; but above the thermocline, it was basically stable. The surface chlorophyll-a concentration was higher at night than during the daytime, and showed a negative correlation with the surface temperature and illumination. The short-term distribution of chlorophyll-a concentration at Guanting Reservoir in summer was mainly related to the temperature stratification and the release of the limiting nutrient phosphorus.
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