Apparent sediment diffusion coefficients for oxygen and oxygen consumption rates measured with microelectrodes and bell jars: applications to oxygen budgets in estuarine intertidal sediments (Oosterschelde, SW Netherlands)
Hofman, P.A.G.; de Jong, S.A.; Wagenvoort, E.J.; Sandee, A.J.J. (1991). Apparent sediment diffusion coefficients for oxygen and oxygen consumption rates measured with microelectrodes and bell jars: applications to oxygen budgets in estuarine intertidal sediments (Oosterschelde, SW Netherlands). Mar. Ecol. Prog. Ser. 69(3): 261-272
We have developed a new method to calculate the apparent sediment diffusion coefficient from oxygen gradient measurements and independently measured downward-directed oxygen production fluxes, both measured with microelectrodes (microelectrode gradient/production method). Diffusion coefficients calculated in this way differed at most 13% from the apparent sediment diffusion coefficients calculated using the bell jar/microelectrode method. The microelectrode gradient/production method was applied to emerged sediments of the Oosterschelde Estuary (SW Netherlands). The Q10 value for this rate ranged from 1.3 to 2.7. Two types of oxygen consumption rates were distinguished. A light-independent oxygen consumption rate depending on diffusion from the overlying water or air was found, varying between 0.63 to 3.65 mmol O2/m2/h at different stations. This consumption increased by 12 to 14% of the gross oxygen production during the emersion period in light, in the presence of benthic microalgal production. A net outflux of maximum 45 mmol O2/m2 was found for the entire emersion period.
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