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首页> 外文期刊>International Journal of Environmental Research and Public Health >Diffusion of Nitrogen and Phosphorus Across the Sediment-Water Interface and In Seawater at Aquaculture Areas of Daya Bay, China
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Diffusion of Nitrogen and Phosphorus Across the Sediment-Water Interface and In Seawater at Aquaculture Areas of Daya Bay, China

机译：大亚湾水产养殖区沉积物-水界面和海水中氮磷的扩散

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摘要

With the yearly increasing marine culture activities in floating cages in Daya Bay, China, the effects of pollution may overlap and lead to more severe water environmental problems. In order to track the impacts of the marine culture in floating cages on water environment, sediments and overlying water were sampled by cylindrical samplers at three representative aquaculture areas of Daya Bay. The water content, porosity, density of sediments as well as the vertical distributions of ammonia nitrogen and active phosphate in pore water along sediments depth were measured. The release rate and annual released quantity of the nutrients across sediment-water interface were calculated using Fick’s Law. A horizontal two-dimensional mathematical model was developed to compute the spatial and temporal distributions of the nutrients in seawater after being released across the sediment-water interface. The results showed that the sediments, with a high content and a large annual released quantity of nitrogen and phosphorus, constitute a potential inner source of seawater pollution. Influenced by tide and water depth, the scope of diffusion and migration of the nutrients appears as a long belt which is about 1 km long and 50 m wide. Seawater in this area is vulnerable to eutrophication.
机译：随着中国大亚湾浮网箱的海洋养殖活动逐年增加，污染的影响可能会重叠并导致更严重的水环境问题。为了追踪浮网箱中海洋养殖对水环境的影响，通过圆柱形采样器在大亚湾三个代表性水产养殖区采样了沉积物和上覆水。测量了水的含量，孔隙率，沉积物密度以及沿沉积物深度的孔隙水中氨氮和活性磷酸盐的垂直分布。使用菲克定律计算沉积物-水界面上养分的释放速率和年释放量。建立了水平二维数学模型，以计算从沉积物-水界面释放出来的海水中养分的时空分布。结果表明，沉积物含量高，年氮，磷的释放量大，构成了潜在的海水污染内源。受潮汐和水深的影响，养分的扩散和迁移范围表现为一条长带，长约1 km，宽50 m。该地区的海水容易富营养化。

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