三河湾一色干潟における栄養塩の溶出速度〔英文〕
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In order to investigate the benthic flux of nutrient salts on intertidal flats and its role on the nutrient circulation, the vertical distribution of nutrient salts in the interstitial water and its fluctua-lion with tidal level variation were observed in summer on an intertidal flat in Mikawa Bay. The tidal exchange of the interstitial water, i. e. exudation of the interstitial water from the flat bed in ebb tide and abrupt penetration of the overlying water into the flat bed in flood tide, were strongly suggested. The benthic flux of nutrient salts due to the tidal exchange was estimated at about 1.5mg atom/m2 day for NH4-N, -0.1mg atom/m2 day for NO2-N+NO3-N, 0.1mg atom/m2 day for PO4-P and 2.7mg atom/m2 day for SiO2-Si. The negative value of the flux for NO2-N+NO3-N indicates the denitrification in the sand layer just below the flat surface. The total benthic flux on the flat estimated for N and P are very small compared with the supply from the land, the total net photosynthesis and the total sedimentation evaluated previously through a box model analysis of nutrient budget on the flat. This probably implies that the nutrients supplied onto the flat circulate mostly within the overlying water and living organisms on the flat, The vertical diffusion coefficient corresponding to the benthic flux due to the tidal exchange was also estimated at the order of 10-3cm2/s which is reasonably large compared with the molecular diffusivity of solute in interstitial waters generally in the order of 10-6 to 10-5cm2/s.
- 日本水産學會の論文
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