Anaerobic conditions China Cyanobacteria Cyanobacteria blooms Dissolution Eutrophic reservoirs Eutrophication Iron Nitrogen Nitrogen and phosphorus Nitrogen assimilation Phosphorus Phytoplankton Phytoplankton dynamics Phytoplankton growth Reservoirs (water) Soluble reactive phosphorus Structure and dynamics Thermal regime Tropical reservoirs Tropics Water quality Year-round cyanobacteria blooms algal bloom anoxic conditions cyanobacterium dissolved inorganic nitrogen eutrophic environment iron phosphorus