Microorganisms in tidal freshwater wetlands affect biogeochemical cycling of nutrients, but the structures and functions of the wetland communities change due to natural and anthropogenic stresses. Soil samples were collected along a 350-m sampling belt in typical tidal freshwater wetlands of Yellow River Delta to investigate nutrient distributions, bacterial community structures and potential metabolic functions under tide and runoff stress by high-throughput sequencing and PICRUSt analysis. The total nitrogen (TN) contents varied greatly while total phosphorous (TP) contents were relatively stable. The bacterial community structures and predicted functions varied along a 350-m sampling belt. Some sulfate-reducing bacteria, nitrifying bacteria, Marmoricola, unclassified_f_Salinisphaeraceae and Oceanococcus exhibited a decreased trend with increasing distances far away from the river bank (B-0m). However, Salinisphaera was more dominant far away from the river bank (B-350m), indicating the stronger tolerance degree under salt stress. Marinobacterium and Marinobacter could be widely detected from B-0m to B-350m, demonstrating that those bacteria could tolerate a broad range of salinity and have its exceptional adaptation capacities. Redundancy analysis (RDA) indicated that nutrient and salinity played an important role in shaping bacterial community composition. NH-N and AP were the key factors in explaining the variance of the genus level. Predicted by PICRUSt analysis, nitrogen fixation (NF), nitrogen mineralization (NM), denitrification and dissimilatory nitrate reduction to ammonium (DNRA) might be the dominant processes of nitrogen metabolism and related genes abundance were abundant in tidal freshwater wetland soils. These findings could provide new insights into the prevention and control of potential nutrient pollution in tidal freshwater wetlands under the dual stress of tide and runoff.
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