Groundwater salinity and spatial distribution of reed marshes in intertidal zones of the Tsuyazaki Inlet.

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  • 津屋崎入江における潮間帯地下の塩分とヨシの空間分布

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<p>The intertidal zones of the Tsuyazaki Inlet were investigated to determine the groundwater salinity in the reed marsh and non-reed-marsh areas. From May 2021 to April 2022, conductivity data loggers were set up at three survey sites in the reed marsh area, the non-reed-marsh area, and the water channel. The daily range in salinity was smaller in the groundwater than in the channel water. Groundwater salinity was significantly lower in the reed marsh areas than the non-reed-marsh areas. The reed marsh area is adjacent to small mountains and the non-reed-marsh area is adjacent to a flat plain, suggesting that the amount of subterranean freshwater differs depending on the terrestrial topographic conditions, which influences the salinities of the groundwater. Moreover, seven and five survey sites were established in the reed marsh areas and non-reed-marsh areas, respectively, and the salinity of the surface water and groundwater was measured in December 2021 and July 2022. The median salinity of the surface water and groundwater in the non-reed-marsh areas exceeded 28.0 ppt, which was almost equivalent to the salinity of seawater. The median salinity of the groundwater was significantly lower in the reed marsh areas than the non-reed-marsh areas. Moreover, the median salinity of the groundwater in the reed marsh areas was in the range where the germination and growth of reeds were possible. Our findings suggest that the groundwater in the reed marsh areas is stable and has lower salinity than the groundwater in the non-reed-marsh areas. Further studies of the groundwater salinity of intertidal zones are expected to help in the selection of more effective candidates for reed marsh restoration areas.</p>

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