Abstract
Microorganisms are widely involved in the transformation process of physical and chemical properties in the geological and hydrogeological environment. Active participation of microorganisms is important features of the biogeochemical reactions during groundwater exploiting along the riverbank filtration. Hydrodynamic condition has a direct or indirect difference control of the biological effectiveness, chemical activity and mobility of the pollution components, which can affect biogeochemical process. In different biogeochemistry, there will be some exclusive functional bacteria, which is of great significance to understand the biogeochemical mechanism of river water infiltration. This study confirms that there are two main different flow paths from river to the center of the depression cone due to different hydrodynamic conditions and spatial characteristics and scaling effects of redox zonation during riverbank filtration. In different flow paths, the microbial abundance shows obvious spatial heterogeneity. The microbial abundance and species similarity degree of the riverbed and deep flow path sediments has significant correlation. There is a significant correlation between the dominant bacteria and the environmental factors in different hydrodynamic conditions on a spatial scale. This study is the first to reveal the response of microbial community structure to water chemical evolution during riparian filtration. Due to significant positive correlation between the Fe/Mn and As, it brings the potential danger for drinking water.
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