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YAO Kaixue,YIN Rui,WANG Yang,CHEN Feng,LI Zhenhua.Distribution Characteristics of Nutrients and Eutrophication Assessment in Yueqing Bay[J].Ocean Development and Management,2024,41(9):121-132
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| 乐清湾海域营养盐时空分布特征及其富营养化评价 |
| 姚开雪,印瑞,王洋,陈峰,李振华 |
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| 浙江海洋大学海洋与渔业研究所;浙江省海洋水产研究所，农业农村部重点渔场渔业资源科学观测实验站，浙江省海洋渔业资源可持续利用技术研究重点实验室;舟山市海洋与渔业局 |
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| 摘要: |
| 文章根据2018—2019年乐清湾海域春季、夏季、秋季、冬季的海洋环境监测数据，对海域中营养盐溶解无机氮（DIN）和活性磷酸盐（DIP）的时空分布特征进行了分析，采用单因子指数法、富营养化指数法及潜在性富营养化模式对该海域的污染程度、富营养化程度及营养盐结构进行了评价。结果表明：乐清湾海域营养盐浓度上存在季节差异，DIN平均浓度秋季>夏季>春季>冬季，DIP平均浓度秋季>冬季=春季>夏季。空间分布上，DIN浓度整体呈现由湾口区向湾顶部逐渐上升的趋势，而DIP浓度4个季节分布趋势各不相同。DIN的分布格局主要受陆源输入、海水养殖、工程建设等因素的影响。DIP的分布格局主要受海水养殖、沉积物释放、电厂温排水等因素的影响。单因子指数法评价结果表明，乐清湾海域4个季节大部分调查站位营养盐浓度不符合第二类海水水质标准和第四类海水水质标准，主要集中在湾顶部和湾中部。富营养指数法评价结果显示，乐清湾海域全年均处于不同程度的富营养化状态，秋季最为严重。潜在性富营养化模式分析表明，该海域大部分调查站位N/P比普遍大于Redfield 比值（16），春季和夏季水体以磷限制状态为主，秋季和冬季水体以无限制状态为主。 |
| 关键词: 乐清湾 溶解无机氮 活性磷酸盐 时空分布 富营养化 |
| DOI：10.20016/j.cnki.hykfygl.2024.09.011 |
| Received:March 04, 2024Revised:September 04, 2024 |
| 基金项目:浙江省公益技术应用研究项目（LGN21C190005）. |
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| Distribution Characteristics of Nutrients and Eutrophication Assessment in Yueqing Bay |
| YAO Kaixue,YIN Rui,WANG Yang,CHEN Feng,LI Zhenhua |
| Marine and Fishery Institute, Zhejiang Ocean University;Zhejiang Institute of Marine Fisheries, Scientific Observing and Experimental Station of Fishery Resources for Key Fishing Grounds, Ministry of Agriculture, Key Laboratory of Sustainable Utilization of Technology Research for Fishery Resources of Zhejiang Province;Ocean and Fishery Bureau of Zhoushan |
| Abstract: |
| Based on the Marine environment monitoring data of Yueqing Bay in spring, summer, autumn and winter from 2018 to 2019, the spatial and temporal distribution characteristics of nutrient salts (dissolved inorganic nitrogen, DIN) and active phosphate (DIP) in the sea were analyzed, and the pollution degree, eutrophication degree and nutrient structure of the sea area were evaluated by single factor index method, eutrophication index method and potential eutrophication model. The results showed that there were seasonal differences in nutrient concentration in Yueqing Bay, with the average DIN concentration in autumn>summer>spring>winter, and the average DIP concentration in autumn > winter = spring > summer. In terms of spatial distribution, DIN concentration showed a gradual upward trend from the mouth of the bay to the top of the bay, while DIP concentration showed different seasonal distribution trends. A few key aspects that affect the DIN distribution pattern include land source input, seawater cultivation, and engineering construction. The primary factors affecting the distribution pattern of DIP are sediment release, seawater culture, and power plant temperature drainage.The results of the single factor index method showed that the nutrient concentrations of most of the surveyed stations in the four seasons of Yueqing Bay did not meet the second and fourth types of seawater quality standards, and were mainly concentrated in the top and middle of the bay. The results of eutrophication index method showed that the sea area of Yueqing Bay was in a state of eutrophication to varying degrees throughout the year, and it was the most serious in autumn. The analysis of potential eutrophication patterns showed that the N/P ratio of most of the survey stations in this area was generally greater than that of the Redfield ratio (16), and the water were mainly in a phosphorus-restricted state in spring and summer, and unrestricted in autumn and winter. |
| Key words: Yueqing Bay, DIN,DIP, Spatial and temporal distribution,Eutrophication |
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