Cite this paper:
Shuzhan MA, Yue WU, Siwen CHEN, Bingfa CHEN, Cheng LIU, Xiaozhi GU, Xiaoli SHI, Kaining CHEN. The impact of the accumulation of algal blooms on reed wetlands in the littoral zones of Chaohu Lake[J]. Journal of Oceanology and Limnology, 2022, 40(5): 1750-1763

The impact of the accumulation of algal blooms on reed wetlands in the littoral zones of Chaohu Lake

Shuzhan MA1,2,4, Yue WU1,2,4, Siwen CHEN1,2,4, Bingfa CHEN3, Cheng LIU1,4, Xiaozhi GU1,4, Xiaoli SHI1, Kaining CHEN1,4,
1 State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
In a large eutrophic lake, the littoral zone is normally an area with high-density elevated aquatic plant life, including algal blooms, where the presence of reed wetlands allows the accumulation of algae. In this study, the impact of accumulated algal blooms in reed wetlands in the littoral zones of Chaohu Lake was investigated seasonally from 2018 to 2019. The concentrations of chlorophyll a (Chl a), total nitrogen (TN), and total phosphorus (TP) were much higher in the reed-covered littoral zones (RCLZ) than in the unvegetated littoral zones (ULZ), indicating that more algal biomass was trapped and accumulated in the RCLZ. Algal biomass could be horizontally transported to downwind littoral zones under low wind speeds, favoring the establishment of blooms. Algal accumulation levels were highest in summer due to high water temperatures and algal biomasses. Likewise, the northern littoral zones were conducive to the development of large algal blooms because of the wind pattern. The values of TN, TP, Chl a, and loss on ignition in surface sediments were higher in the RCLZ than in the ULZ. Moreover, the diffusive fluxes of ammonium and soluble reactive phosphorus were also higher in the RCLZ than in the ULZ. Considering the capability of reed wetlands to trap algae, mechanical salvage and other physical methods should be adopted to eliminate algal biomass when massive blooms accumulate in the RCLZ.
Key words:    Chaohu Lake    littoral zone    reed wetlands    algal blooms   
Received: 2021-08-07   Revised: 2021-09-22
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