大鹏澳网箱养殖海域磷酸盐在沉积物-海水界面上换速率的研究

应用实验室培养法研究了大亚湾大鹏澳网箱养殖海域磷酸盐（PO4-P）在沉积物-海水界面上的交换通量；并根据改进的连续函数法计算了PO4-P在沉积物-海水界面上交换速率。结果表明：（1）PO4-P在沉积物-海水界面上的交换通量随时间的变化关系满足以e为底的指数衰减函数；（2）整个调查海域PO4-P在沉积物-海水界面上的交换速率为0.27~2.47 mmolm-2d-1。其中，网箱养殖区PO4-P的交换速率（0.82~2.47 mmolm-2d-1）明显高于对照区PO4-P的交换速率（0.27~0.62 mmolm-2d-1），长时期的养殖活动使养殖区沉积环境中的磷得以积累，PO4-P在沉积物-水界面上的交换速率升高。

The study of phosphate exchange rates at the sediment water interface in fish cage area of Dapengao

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-Pat the sediment-water interface varied from 0.27 to 2.47 mmolm-2d-1 in the whole area, but the exchange rates varied from 0.82 to 2.47 mmolm-2d-1 in the fish cage area, were obviously higher than those in the control area varied from 0.27 to 0.62 mmolm-2d-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.