摘要：To identify key factors that control primary production (P.P.) and trigger cyanobacterial harmful algal blooms (cHABs), we investigated spatio-temporal variations in P.P. in a continuous weir system in the Nakdong River once or twice a month from April to October 2018. P.P. was measured through an in-situ incubation experiment using a sup13/supC tracer. Relative proportion of pigment-based phytoplankton composition was calculated by the CHEMTAX program based on pigment analysis using a high-performance liquid chromatography (HPLC). P.P. was higher in spring (1130 ± 1140 mg C msup−2/sup dsup−1/sup) and summer (1060 ± 814 mg C msup−2/sup dsup−1/sup) than autumn (180 ± 220 mg C msup−2/sup dsup−1/sup), and tended to increase downstream. P.P. was negatively related to POsub4/subsup3−/sup (r = −0.41, ip/i 0.01) due to utilization by phytoplankton during the spring and summer when it was high. The relative proportion of pigment-based cyanobacteria (mainly iMicrocystis/i sp.) was positively correlated with water temperature (r = 0.79, ip/i 0.01) and hydraulic retention time (HRT, r = 0.67, ip/i 0.01), suggesting that these two factors should affect cHABs in summer. Therefore, to control HRT could be one of the solutions for reducing cHABs in a continuous weir system.
