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Denitrification in a seashore sandy deposit influenced by groundwater discharge

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Abstract

The chemical compositions of ground water and organic matter in sediments were investigated at a sandy shore of Tokyo Bay, Japan to determine the fate of ground water NO3 −. On the basis of Cl− distribution in ground water, the beach was classified into freshwater (FR)-, transition (TR)-, and seawater (SW)-zones from the land toward the shoreline. The NO3 − and N2O did not behave conservatively with respect to Cl− during subsurface mixing of freshwater and seawater, suggesting NO3 − consumption and N2O production in the TR-zone. Absence of beach vegetation indicated that NO3 − assimilation by higher plants was not as important as NO3 − sink. Low NH4 + concentrations in ground water revealed little reduction of NO3 − to NH4 +. These facts implied that microbial denitrification and assimilation were the likely sinks for ground water NO3 −. The potential activity and number of denitrifiers in water-saturated sediment were highest in the low-chlorinity part of the TR-zone. The location of the highest potential denitrification activity (DN-zone) overlapped with that of the highest NO3 − concentration. The C/N ratio and carbon isotope ratio (δ13C) of organic matter in sediment (< 100 -μm) varied from 12.0 to 22.5 and from −22.5 to −25.5‰, respectively. The δ13C value was inversely related to the C/N ratio (r 2 = 0.968, n = 11), which was explained by the mixing of organic matters of terrestrial and marine origins. In the DN-zone, the fine sediments were rich in organic matters with high C/N ratios and low δ13C values, implying that dissolved organic matters of terrestrial origin might have been immobilized under slightly saline conditions. A concurrent supply of NO3 − and organic matter to the TR-zone by ground water discharge probably generates favorable conditions for denitrifiers. Ground water NO3 − discharged to the beach is thus partially denitrified and fixed as microbial biomass before it enters the sea. Further studies are necessary to determine the relative contribution of these processes for NO3 − removal.

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Authors
  1. Shingo Ueda
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  2. Chun-Sim U. Go
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  3. Masahiro Suzumura
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  4. Eiich Sumi
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Ueda, S., Go, CS.U., Suzumura, M. et al. Denitrification in a seashore sandy deposit influenced by groundwater discharge. Biogeochemistry 63, 187–205 (2003). https://doi.org/10.1023/A:1023350227883

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