抄録
The purpose of this study was to examine the influence of turbid waters on phytoplankton biomass and flora in reservoirs. We examined water quality and phytoplankton in Tedori and Konade Reservoirs. Phytoplankton biomass increased and its flora changed when the turbidity of the lake waters reached about 20mg·l-1 or above due to inflow of turbid waters or after that time. The flagellated chlorophytes, such as Pandorina, Carteria and Chlamydomonas, increased at that time. Concentration of T-P increased with the rise of turbidity (r≈0.8). From the relationship between T-P and D-P (dissolved T-P), it was considered that most of T-P was the insoluble type which was adsorbed on the mud particles in Tedori Reservoir. In Konade Reservoir, D-P was among the values from 0.004 to 0.012 mg·l-1 in spite of the concentration of T-P, and Anabaena of cyanophytes, other than Chlamydomonas of flagellated chlorophytes, increased in the case of turbiditiy above 20mg·l-1. It was presumed that the difference of flora at the turbidities above 20 mg·l-1 between the reservoirs might be due to that of D-P concentration.
