长江口潮滩沉积物－水界面无机氮交换通量

doi:10.11821/xb200502016

Abstract

Abstract:

Inorganic nitrogen fluxes at the sediment-water interface of seven typical sites in tidal flats of the Yangtze estuary had been determined seasonally during more than three years. The results revealed that the sediment-water exchanges of inorganic nitrogen appeared to be of complicated spatial differences and seasonal variations. The measured fluxes of NO^-₃-N and NH⁺₄-N in the Yangtze estuary were higher than those in other estuaries, varying respectively from -32.82 to 24.13 mmol·m^-2·d^-1 and from -18.45 to 10.65 mmol·m^-2·d^-1. However, the fluxes of NO^-_{2/sub>-N were very low, and only varied from -1.15 to 2.82 mmol·m^-2·d^-1. The spatial and seasonal differences between the upper and lower estuary for the NO^-₃-N fluxes were observed clearly, but the NH⁺₄-N fluxes exhibited the spatial and seasonal differences between the south and north bank. It had been recognized that the NH⁺₄-N exchange behavior was mainly controlled by the salinity, whereas the NO^-₃-N exchange behavior was influenced by the different combinations of the sediment grain size, nitrate concentration in overlying water, sediment organic matter content, water temperature and dissolved oxygen concentration.}

Key words: inorganic nitrogen, exchange flux, sediment-water interface, tidal flat, Yangtze estuary

CHEN Zhenlou, WANG Dongqi, XU Shiyuan, ZHANG Xingzheng, LIU Jie. Inorganic Nitrogen Fluxes at the Sediment-water Interface in Tidal Flats of the Yangtze Estuary[J].Acta Geographica Sinica, 2005, 60(2): 328-336.

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Inorganic Nitrogen Fluxes at the Sediment-water Interface in Tidal Flats of the Yangtze Estuary

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