An Evaluation of Phosphate Upward Fluxes from the Coastal Sediments by Three Different Methods

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  • Evaluation of Phosphate Upward Fluxes f
  • An evaluateon of phosphate upward fluxes from the coastal sediments by three different methods

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Abstract

The upward fluxes of phosphate across the overlying water-sediment interface were evaluated by three different methods. In method I, the fluxes were estimated from vertical profiles of interstitial phosphate concentrations, followed by the diagenetic model (Fick's law). Measurment of fluxes in method II was based on the changes in phosphate concentrations of overlying water in the core tubes incubated under simulated in situ dissolved oxgen conditions, and in method III, phosphate release was measured during the incubation of overlying water with surface sediments in glass bottles under dark conditions at three different temperatures. The fluxes determined by these threemethods agreed well with each other. It was considered that during the summer period, in situ fluxesin our study area might reach almost the potential level. Moreover, it was evident that the flux was influenced by ambient temperature under anaerobic condition.

Journal

  • Fisheries science

    Fisheries science 63 (4), 567-572, 1997

    The Japanese Society of Fisheries Science

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