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海洋科学  2008 

长江口沉积物-水界面无机氮交换通量的模拟测定

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Keywords: 长江口,沉积物-水界面,可溶态无机氮,盐度,交换通量

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Abstract:

通过对长江口水下沉积物-水界面可溶态无机氮(DIN=NO3-+NO2-+NH4+)的交换行为研究发现,低潮时近口点(A)沉积物是水体DIN的汇(?2006.99μmol/(m2?h)),而靠近口外点(B)沉积物是水体DIN的源(1848.27μmol/(m2?h))。但高潮时,A点沉积物转变为水体DIN的源(1880.97μmol/(m2?h)),而B点的沉积物转变成为DIN的汇(?956.64μmol/(m2?h))。在距河口较远高低潮盐度变化微弱的地点(P),沉积物始终是水体DIN的源(1872.41μmol/(m2?h))。高低潮海水盐度的变化对沉积物中微生物活动的影响是导致这一变化的主要原因。

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