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Taking the Pengxi River, a typical tributary bay of the Three Gorges Reservoir, as an example, continuous monitoring of the water flow, water quality, and algal bloom in the bay during the drawdown period in 2023 was carried out. The hydrodynamics, thermal stratification, and water quality evolution patterns of the tributary bay were analyzed, and the occurrence, disappearance, and influencing factors of algal blooms were revealed. The results show that during the observation period, the chlorophyll a of phytoplankton in the Pengxi River bay was positively correlated with water temperature (r=0.43, P<0.05) and euphotic layer depth (r=0.38, P<0.05), and negatively correlated with upstream inflow (r=-0.53), flow velocity (r=-0.54), and mixed layer depth Zmix (r =-0.37). However, nutrients were not the limiting factors for the occurrence and disappearance of algal blooms. When the water temperature was suitable and the thermal stratification was stable, algal blooms began to occur. A gradual water level drawdown (<0.2m/day) fails to notably enhance flow velocity or break thermal stratification in the bay, resulting in minimal suppression of algal blooms in tributary bays. During the drawdown period, rainfall and upstream inflow could significantly affect the hydrodynamic processes and nutrient levels in the bay, which were the key factors determining the occurrence and disappearance of algal blooms in Gaoyang Lake. Increasing the discharge flow from Hanfeng Lake (>80m3/s)could effectively control algal blooms in the Pengxi River bay.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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