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中文摘要：
于2014年5月15日—6月13日对东海海水营养盐（DIN（溶解无机氮）、SiO_3~（2-）-Si、PO_4~（3-）-P）的水平和垂直分布进行了调查分析,并讨论了其影响因素。结果表明,在研究区域,无论是微表层还是表层,海水营养盐受陆地径流的影响近岸浓度较高。受黑潮次表层水涌升的影响,远海部分站位营养盐出现高值;受陆地径流的影响,长江口断面表层营养盐浓度自西向东递减,底层可能受有机质分解及富含营养盐沉积岩的溶解影响导致营养盐浓度较高。不同营养盐在微表层的富集因子计算结果表明,除PO_4~（3-）-P外,微表层对SiO_3~（2-）-Si、NO_2~--N、NO_3~--N、NH_4~＋-N和DIN都产生明显的富集作用,富集因子中位数介于1.05~1.19之间。DH2-1站位的营养盐周日变化结果表明,藻类通过光合作用使得NH_4~＋-N、PO_4~（3-）-P、SiO_3~（2-）-Si浓度降低,NH_4~＋-N的光化学氧化和硝化作用使NO_2~--N与NO_3~--N浓度变高;DIN中NH_4~＋-N对控制藻类细胞丰度起着重要作用。
英文摘要：
The horizontal and vertical distributions of nutrients（DIN,PO_4~（3-）-P,SiO_3~（2-）-Si）were investigated in the East China Sea from May 15 thto June 13 rd,2014.The results showed that the nutrient concentrations in the sea-surface microlayer and surface water were higher than those in coastal waters in the study area because of the effect of terrestrial runoff.However,the high nutrient concentrations also appeared at some stations in the open sea due to effects of the Kuroshio subsurface water upwelling.Because of the terrestrial runoff influence,the surface nutrient concentrations at the transect of the Changjiang River estuary decreased gradually from inshore to offshore.Biological decomposition of organic matter and dissolution of nutrient enriched sedimentary rock resulted in higher concentrations of nutrient in the bottom waters.Calculation of enrichment factors of various nutrients showed that except PO_4~（3-）-P,SiO_3~（2-）-Si,NO_2~--N,NO_3~--N,NH_4~＋-N and DIN were all enriched in the sea-surface microlayer,with enrichment factors median ranging from 1.05 to 1.19.Diurnal variation of nutrients was investigated at DH2-1station and the results showed that concentrations of NH_4~＋-N,PO_4~（3-）-P and SiO_3~（2-）-Si decreased in the daytime due to photosynthesis,and photochemical oxidation and nitrification of NH_4~＋-N increased concentrations of NO_2~--N and NO_3~--N.NH_4~＋-N in DIN played important role in controlling the abundance of algal cells.
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