Abstract

Overlying water from the tidal marshes in five estuaries and bays, namely, Xinghua Bay (Fuzhou Part), Fuqing Bay, Luoyuan Bay, Minjiang River Estuary, and Aojiang River Estuary of the Fuzhou region were collected in autumn of 2015, and the nitrogen and phosphorus nutrient concentration and other physical and chemical indicators of the overlying water were measured to discuss the reasons for the differences in the nutrient concentration of the overlying water in tidal marsh wetlands in different bays and estuaries. There were significant differences in the nitrogen and phosphorus nutrient concentrations of the overlying waters of the tidal marshes in the different bays and estuaries (P<0.05). The concentrations of nitrogen and phosphorus in Fuqing Bay were relatively high, while Xinghua Bay had the lowest nitrogen nutrient concentration and Aojiang River Estuary had the lowest phosphorus nutrient concentration. The nutrient concentration of the overlying water in Fuqing Bay is mainly affected by regional aquaculture, land-source pollution, and topography, while that in Xinghua Bay is mainly affected by tides. The vegetation type had an effect on the nutrient concentration of the overlying water in the wetlands. The concentration of nitrogenous nutrients in the overlying water of the marsh wetland in the Suaeda australis community was relatively high, while the nitrogen and phosphorus nutrient concentrations in the overlying water of the Spartina alterniflora community wetland was relatively low; the concentrations of nutrients in the overlying water of different plant communities in the same bay or estuary marsh wetland were different, and the relationships were complex. Tides, surface runoff, plant communities, topography, and human activities all had an important impact on the nutrient concentrations in the overlying waters of the bay and estuary wetlands.

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