Responses of sediment nitrogen forms and bacterial communities to different aquatic nitrogen conditions in three submerged macrophyte-type ecological treatment systems

Neglected Dissimilatory Nitrate Reduction to Ammonium Pathway of Nitrate Reduction in the Chinese Marginal Sea and Its Microbial Community Assembly Driven by Stochastic Processes

“…The MC, the concentrations of TN, TS, and NH 4 + –N of sediment, the longitude, latitude, and depth of sampling sites, and the temperature and conductivity of bottom water showed significant correlations to DNRA microbial communities and key species in this study (Figure C). Previous studies pointed out that the composition of inorganic N was an important factor affecting the microbial community of nitrogen cycle, which can regulate the N transformation process mediated by microorganisms. , Similar to our results, in shallow lakes and inland river sediments, the distribution of DNRA communities was also influenced by the content of extractable NH 4 + –N and TN. ,, At the spatial scale, water depth was an important source of survival stress for marine microbiota as depth can cause strong fluctuations in temperature, pressure, and other physicochemical properties. , The significant correlation between DNRA community structure and longitude may originate from the spatial shift in microbial structure from the estuary to the open ocean …”

“…Previous studies pointed out that the composition of inorganic N was an important factor affecting the microbial community of nitrogen cycle, which can regulate the N transformation process mediated by microorganisms. 19,50 Similar to our results, in shallow lakes and inland river sediments, the distribution of DNRA communities was also influenced by the content of extractable NH 4 + −N and TN. 9,25,51 At the spatial scale, water depth was an important source of survival stress for marine microbiota as depth can cause strong fluctuations in temperature, pressure, and other physicochemical properties.…”