秋季牟平海洋牧场及其邻近海域沉积物-水界面营养盐交换通量

本研究于2017年11月在牟平海洋牧场及其邻近海域采集表层沉积物样品，通过实验室模拟培养法估算了该季节沉积物-水界面营养盐的交换通量，并研究了溶解氧与温度对交换通量的影响。结果表明，目标海域沉积物水界面NO₂-N、NO₃-N、NH₄-N、PO₄-P的交换通量平均值分别为1.01、-181.91、-268.41、-45.69 μmol/（m2·d），沉积物表现为NO₂-N的"源"，NO₃-N、NH₄-N、PO₄-P的"汇"。溶解氧及温度均对交换通量有较大影响，富氧条件下NO₂-N、NH₄-N、PO₄-P交换通量大于贫氧条件，NO₃-N反之；温度升高，NO₂-N、NO₃-N、NH₄-N的交换通量增大，PO₄-P反之。

Exchange fluxes of nutrients across sediment-water interface in the Muping Marine Ranch and its adjacent waters in autumn

In this research, the surface sediment samples were collected from the Muping Marine Ranch and its adjacent area in November 2017.The exchange fluxes of nutrients across the sediment-water interface were estimated by a laboratory incubation method.In addition, the effects of dissolved oxygen and temperature on the fluxes were also studied.The results indicated that the average exchange fluxes of NO₂-N, NO₃-N, NH₄-N and PO₄-P across sediment-water interface were 1.01, -181.91, -268.41 and -45.69 μmol/(m2·d), respectively.The sediments acted as a "source" of NO₂-N and a "sink" of NO₃-N, NH₄-N and PO₄-P.Both dissolved oxygen and temperature had obvious influence on the fluxes.The results showed that the fluxes of NO₂-N, NH₄-N and PO₄-P were higher in the aerobic situation than in the anoxic situation, while that of NO₃-N showed the opposite trend; the fluxes of NO₂-N, NO₃-N and NH₄-N were higher at a higher temperature, but that of PO₄-P was opposite to them.