Seawater-groundwater exchange and nutrients carried by submarine groundwater discharge in different types of wetlands at Jiaozhou Bay, China

摘要

Highlights?Four typical transects at the intertidal wetlands of Jiaozhou Bay were established.?There is a positive correlation between the NO3-N/DIN ratio and SGD rates.?Sandy beach occupies 16% of the intertidal zone while contributes 60–80% of SGD.?The DIN carried by SGD is one order of magnitude larger than that by the Dagu River.?High DIN:DIP ratios of SGD contribute to the Bay's phosphate-limited conditions.AbstractIn Jiaozhou Bay, there are four wetland types, including sandy beaches, mud flats, tidal marshes, and estuarine intertidal zones. Four typical transects representing each of the wetland types were selected to investigate the flow dynamics, seawater-groundwater exchange and nutrients carried by submarine groundwater discharge (SGD). Based on field measurements of groundw