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于2007年5月～2008年4月对大亚湾海域微表层、次表层和底层氮(N)、磷(P)、硅(Si)营养盐进行了每月一次的周年调查和比较分析.结果表明,大亚湾海域营养盐含量较前期调查略有上升,可溶性无机氮(DIN)、可溶性无机磷(DIP)、可溶性硅酸盐(DSi)的平均值分别为8.93、0.41和9.41μmol·L-1,养殖区营养盐含量明显较高.DIN组成以NH4+-N和NO3-N为主,在3个水层中,NO3-N在微表层中的百分比含量相对较高,NH4+-N在次表层中的百分比含量较高.大亚湾海域DIN、DSi含量丰富,DIP含量较低,N∶P远远高于Redfield比值,浮游植物的生长明显受到P限制.微表层DIP和DSi含量明显较高,且波动明显.大亚湾海域N、P以有机营养物质为主,微表层中DIN百分比含量较低,DIP百分比含量较高.微表层对营养盐具有显著富集作用,平均富集系数在1.31～4.68之间;对磷的富集作用较强,对DIP和总磷(TP)的平均富集系数分别达到4.68和1.95.微表层对不同营养盐的富集概率在47.2%～97.2%之间,其中,对TP和DSi的富集概率最高.调查结果表明,近年来大亚湾水质有进一步恶化的趋势,而微表层营养盐结构的变化可能会导致该水层生物群落结构的改变.
The monthly, annual survey and comparative analysis of nitrogen, phosphorus and silicon nutrients in the surface, subsurface and bottom layers of Daya Bay from May 2007 to April 2008 were conducted. , The nutrient contents in the Daya Bay area slightly increased from the previous survey. The average values of soluble inorganic nitrogen (DIN), soluble inorganic phosphorus (DIP) and soluble silicate (DSi) were 8.93, 0.41 and 9.41μmol·L-1, Nutrient content of aquaculture zone was significantly higher than that of NH4 + -N and NO3-N, and NO3-N content in micro-surface was higher in the three water layers. NH4 + -N was found in the subsurface The content of DIN and DSi in Daya Bay area is rich and the content of DIP is low, N: P is much higher than that of Redfield, the growth of phytoplankton is obviously limited by P. The contents of DIP and DSi in micro-surface are obviously higher and fluctuate Obviously, N and P in Daya Bay area are dominated by organic nutrients, with a lower content of DIN and a higher content of DIP in the micro-surface layer.The micro-surface layer has a significant enrichment effect on nutrients, and the average enrichment coefficient is between 1.31 and 4.68 ; The enrichment of phosphorus is strong, the average enrichment coefficient of DIP and total phosphorus (TP) is 4.68 And 1.95, respectively.The enrichment probabilities of TPs and DSi were the highest in the range of 47.2% ~ 97.2%, and the results showed that the water quality of Daya Bay had a further deterioration trend in recent years, Changes in the structure of nutrients in the surface layer may lead to changes in the structure of the aquatic community.