This study takes Bengbu Segment as an example, analyzes the Aquatic Organisms evolution, rainfall process, runoff process, water quality, and points out their interrelations and interaction process. The reduction of Aquatic Organism is mainly affected by channel morphology, runoff cyclical, water quality, and their ecosystem structure at the same time. Aquatic Organisms evolution has the same trend as the cyclical variations of rainfall and runoff.
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