Authors:
Qingsheng Li
;
Cui Wang
;
Jinlong Jiang
and
Siting Chen
Affiliation:
Third Institute of Oceanography, State Oceanic Administration, Xiamen and Fujian, China
Keyword(s):
Nutrients, eutrophication, spatiotemporal changes, semi-enclosed bay, Southeast China
Abstract:
According to the data of water quality monitoring in Xiamen Bay in May and October 2010, we analysed the spatiotemporal variation trend of nutrients and eutrophication, discussed the main potential sources. The results show that Western Sea, Jiulong River Estuary and Tongan Bay were the high value areas for chemical oxygen demand (COD), dissolved inorganic nitrogen (DIN) and active phosphate (PO4-P). The eutrophication level decreased from Western Sea and Jiulong Estuary to Southeast Sea and Dadeng Sea. The eutrophication in May was lower than that in October. The proportion of ammonia nitrogen was higher in Western Sea and Tongan Bay, while in the Jiulong Estuary, Southeast Sea and Dadeng Seas, the proportion of nitrate nitrogen was higher. Poor hydrodynamic forces, land-based pollution and short-term strong rainfall might contribute to eutrophication. Correlation analysis showed that the main sources of pollution were land-based sources. The origins of COD, NO2-N and NH3-N were sim
ilar. Changes in DO might be related to the N/P ratio. The research results could provide technical support for marine environmental protection in Xiamen Bay.
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