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本文阐述了深圳近岸海域(大鹏湾北部和东部沿岸、大亚湾西部沿岸、深圳湾西北部沿岸及珠江口东南部沿岸)四个海区氮磷营养盐近30 a变化趋势,统计了各海区历年赤潮发生次数和累计总面积,并对氮磷营养盐含量和赤潮发生次数、累计总面积进行了相关性分析。结果表明,深圳近岸海域氮磷营养盐污染状况为东优西劣的趋势,东部海域水体均未达到富营养化水平,而西部海域水体均表现出一定程度的富营养化(部分年份为磷限制潜在性富营养);赤潮发生次数以大鹏湾最高,深圳湾次之,累计总面积以深圳湾最大,珠江口次之;相关性分析结果表明,DIN、PO4-P与四个海区赤潮发生次数、累计总面积均无显著相关性,而NH4-N、NO3-N分别与大鹏湾和珠江口海域赤潮暴发次数、累计总面积呈显著相关性。
In this paper, the change trends of nitrogen and phosphorus nutrients in four coastal areas in the coastal areas of Shenzhen (the northern and eastern coasts of Dapeng Bay, the western coast of Daya Bay, the northwestern coast of Shenzhen Bay and the southeastern coast of the Pearl River estuary) are described. The occurrence frequency of red tide and the total area. The correlation analysis was conducted between the content of nitrogen and phosphorus, the number of red tide and the total area of red tide. The results showed that the pollution status of N and P nutrients in coastal waters of Shenzhen was a trend of east and west being worse. The water bodies in the eastern sea area did not reach the level of eutrophication while the waters in the western part of the sea area all showed some eutrophication Limiting potential eutrophication). The frequency of red tide was the highest in Dapeng Bay and the second in Shenzhen Bay. The cumulative total area was the largest in Shenzhen Bay and the second in the Pearl River. The correlation analysis showed that DIN, PO4-P and four sea areas The number of occurrences and the total area were not significantly correlated, while NH4-N and NO3-N were significantly correlated with the number of red tide outbreaks and the total accumulated area in Dapeng Bay and Pearl River Estuary respectively.