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Hydrological impacts on denitrification and nirS- and nirK- microbial community shifts in floodplains: Insights from water recession and flooding periods
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DOI：10.1016/j.jes.2026.03.074.png)
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Abstract
En 中文
Floodplains play a critical role in mitigating nitrogen loads and nutrient pollution in aquatic ecosystems through denitrification. However, the effects of the impacts of dramatic water-level fluctuations on nitrogen dynamics and the associated microbial communities remains poorly understood. This study explored denitrification processes and alterations in functional microbial communities in the Poyang Lake wetlands, with particular focus on microbial responses to hydrological recession and flooding. Denitrification activity was negligible in soils dominated by Carex cinerascens and Cynodon dactylon during water recession, but potential denitrification rates increased significantly during flooding. Ordination regression analysis and Mantel tests showed that these denitrification changes correlated strongly with shifts in functional microbial communities. In particular, studies have shown that the alpha-diversity of the soil nirS bacterial community was significantly lower after the recession than during flooding, indicating inhibition of denitrifying communities under drought. During flooding, key species such as nirS-type Rhodocyclales, nirK-type Bradyrhizobium, and Nitrosospira became abundant. These denitrifiers and environmental factors (moisture, temperature, and substrate availability) played crucial roles in denitrification during the hydrological changes in floodplains.
Keywords:
Floodplains
Hydrological changes
Nitrogen dynamics
Denitrification
Microbial communities
NirS /nirK genes
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