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      Distribution and Structure of Nitrogen and Phosphorus Nutrients of 15 Seawater Culture Areas in Shandong Province,2016

      LIU Aiying;YU Guanglei;HE Jianlong;CHENG Ling;FU Ping;SU Bo;MA Yuanqing;Shandong Marine Resource and Environment Research Institute,Shandong Provincial Key Laboratory of Restoration for Marine Ecology;  
      Nutrient salt is the material basis of marine biological activities,and its change has an important influence on the structure and function of aquaculture ecosystem.Based on the monitoring data of March,May,August and October,2016,the distribution characteristics of nitrogen and phosphorus of 15seawater culture areas in Shandong were analyzed and discussed.The results showed that the concentrations of DIN ranged from 0.0073mg/L to 2.20mg/L with an average content of 0.192mg/L.The DIN concentrations were between 0.05mg/L and 0.2mg/L in 68%of the survey stations,and were generally higher in the culture areas of Bohai Bay and Laizhou Bay than that in Yellow Sea culture area.The concentrations of PO_4-P ranged from0.0073mg/L to 0.0895mg/L with an average content of 0.00598mg/L.The PO_4-P concentrations were between 0.001mg/L and 0.015mg/L in 81.9%of the survey stations.And about 66%of the survey area was in phosphorus restricted poor nutrient condition.No significant differences of the DIN and PO_4-P concentrations were detected between the surface and bottom layer.The proportions of NO_3-N,NO_2-N and NH_4-N in DIN were 68.91%,6.82%and 27.27%,respectively,and NO_3-N was the main form of DIN.The proportion of NH_4-N in DIN was the highest in summer,with an average proportion of 36.5%.Generally,the range of N/P ratios was from1.6to 2532.3,and the main N/P distribution range was from 10 to 40.The N/P ratios of the culture area in Bohai Sea were significantly higher than that in Yellow Sea.The distribution of DIN was mainly influenced by the terrestrial input.There was no obvious regularity in PO_4-P horizontal distribution.
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