Fig. 3: The seasonal and inter-annual dynamics of environmental factors in QCS Reservoir from 2013 to 2015 according to generalized additive time series models.

The shapes of the fitted surfaces are indicated by color (white: high; green: low) as well as the numbers along the contour lines. a Total nitrogen (mg L⁻¹). b Nitrate (mg L⁻¹). c Ammonia (mg L⁻¹). d Total phosphorus (mg L⁻¹). e Water temperature (°C). f The mean PAR of 1 week before investigation (mol m⁻² d⁻¹). g Wind speed (m s⁻¹). h Relative humidity (%). i Precipitation (mm d⁻¹).