| Citation: |
LI Zhan-dong, LIN Qin, HUANG Hong-hui. The study of phosphate exchange rates at the sediment-water interface in fish cage area of Dapengao[J]. South China Fisheries Science, 2006, 2(6): 25-30.
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The benthic fluxes of PO4-P at the sediment-water interface in fish cage area of Dapengao were measured by laboratory incubation experiments, and a function method with dependence of the exchange rate was developed. In the function method, the average exchange rates of PO4-P at the sediment-water interface were calculated. The results show that: (1) the relation between PO4-P exchange fluxes and incubation time fit the e exponent attenuation function; (2) the exchange rates of PO4-P at the sediment-water interface varied from 0.27 to 2.47 mmol · m-2 · d-1 in the whole area, but the exchange rates varied from 0.82 to 2.47 mmol · m-2 · d-1 in the fish cage area, were obviously higher than those in the control area varied from 0.27 to 0.62 mmol · m-2 · d-1. Since phosphor were accumulated gradually in the long period breeding process, the exchange rates of PO4-P in the fish cage area increased accordingly.
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