2012年长江口及其邻近海域营养盐分布的季节变化及影响因素
发布时间：2019-04-20 12:59
【摘要】：根据2012年3、5、8和12月4个航次长江口及邻近海域的调查数据,研究了氮、磷、硅营养盐及总氮(TN)、总磷(TP)的浓度特点,及其与盐度的相关性和叶绿素a的变化特征。结果表明,总溶解无机氮(DIN)、硅酸盐(Si O3)和TN的浓度分布均表现出自长江口至外海迅速降低的特征,且与盐度呈现显著负相关性。磷酸盐(PO4)的浓度降低程度随远离河口而减弱,且与盐度的相关性相对较弱,可能存在外海水补充;而TP则在长江口浑浊带海域呈现出较高浓度,且与盐度的相关性不明显,可能是受浑浊带泥沙吸附所致。在调查海区内,DIN与TN的平均值在夏季较低,结合叶绿素a数据分析,认为浮游植物吸收作用降低了DIN和TN的浓度。通过分析各营养盐之间的比值特征,进一步考察了营养盐来源及其对浮游植物生长的可能限制情况,其中N/P比值的变化同样揭示了N主要来自于长江水而P有部分来自于外海水的特征。该比值呈现远离河口而降低的特征,且在浑浊带无明显季节变化。春季和夏季有超过90%的调查站位显示潜在P限制,且均位于外海区。与历史资料对比发现,春季和夏季潜在P限制站位的比例明显升高,而潜在Si限制站位比例在春季和夏季降低。本文研究认为,营养盐含量及组成结构反映了该海域浮游植物群落组成和优势种的演替。
[Abstract]:Based on the survey data of the Yangtze Estuary and its adjacent waters in 3,5,8 and December 2012, the concentration characteristics of nitrogen, phosphorus, silicon nutrients and total nitrogen (TN), total phosphorus (TP), their correlation with salinity and the variation of chlorophyll a were studied. The results showed that the concentration distribution of total dissolved inorganic nitrogen (DIN), silicate (Si O 3) and TN decreased rapidly from the Yangtze River estuary to the open sea, and showed a significant negative correlation with salinity. The decreasing degree of phosphate (PO4) concentration decreases with the distance from the estuary, and the correlation with salinity is relatively weak, which may be supplemented by out-sea water. However, the concentration of TP in the turbidity zone of the Yangtze River Estuary is higher than that in the turbidity zone of the Yangtze River Estuary, and the correlation between the concentration and salinity is not obvious, which may be caused by the sediment adsorption in the turbidity zone. The mean values of DIN and TN in the investigated sea area were lower in summer. Combined with chlorophyll a data analysis, phytoplankton uptake reduced the concentrations of DIN and TN. In this paper, the source of nutrient and its possible restriction on phytoplankton growth were further investigated by analyzing the ratio characteristics of different nutrients. The change of N / P ratio also shows that N is mainly from the Yangtze River water and P is partly from the outer sea water. The ratio is lower away from the estuary and has no obvious seasonal variation in the turbid zone. More than 90% of survey stations in spring and summer show potential P limitation, and both are located in the offshore area. Compared with the historical data, it was found that the proportion of potential P-restricted stations increased significantly in spring and summer, while the proportion of potential Si-restricted stations decreased in spring and summer. The results showed that the nutrient content and composition reflected the composition of phytoplankton community and the succession of dominant species in the sea area.
【作者单位】： 中国科学院海洋研究所海洋生态与环境科学重点实验室;青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室;中国科学院大学;
【基金】：国家自然科学基金-山东省人民政府联合资助项目,U1406403号;国家自然科学基金资助项目,41276116号 中国科学院战略先导科技专项(A类);XDA11020601号
【分类号】：P734.4
[Abstract]:Based on the survey data of the Yangtze Estuary and its adjacent waters in 3,5,8 and December 2012, the concentration characteristics of nitrogen, phosphorus, silicon nutrients and total nitrogen (TN), total phosphorus (TP), their correlation with salinity and the variation of chlorophyll a were studied. The results showed that the concentration distribution of total dissolved inorganic nitrogen (DIN), silicate (Si O 3) and TN decreased rapidly from the Yangtze River estuary to the open sea, and showed a significant negative correlation with salinity. The decreasing degree of phosphate (PO4) concentration decreases with the distance from the estuary, and the correlation with salinity is relatively weak, which may be supplemented by out-sea water. However, the concentration of TP in the turbidity zone of the Yangtze River Estuary is higher than that in the turbidity zone of the Yangtze River Estuary, and the correlation between the concentration and salinity is not obvious, which may be caused by the sediment adsorption in the turbidity zone. The mean values of DIN and TN in the investigated sea area were lower in summer. Combined with chlorophyll a data analysis, phytoplankton uptake reduced the concentrations of DIN and TN. In this paper, the source of nutrient and its possible restriction on phytoplankton growth were further investigated by analyzing the ratio characteristics of different nutrients. The change of N / P ratio also shows that N is mainly from the Yangtze River water and P is partly from the outer sea water. The ratio is lower away from the estuary and has no obvious seasonal variation in the turbid zone. More than 90% of survey stations in spring and summer show potential P limitation, and both are located in the offshore area. Compared with the historical data, it was found that the proportion of potential P-restricted stations increased significantly in spring and summer, while the proportion of potential Si-restricted stations decreased in spring and summer. The results showed that the nutrient content and composition reflected the composition of phytoplankton community and the succession of dominant species in the sea area.
【作者单位】： 中国科学院海洋研究所海洋生态与环境科学重点实验室;青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室;中国科学院大学;
【基金】：国家自然科学基金-山东省人民政府联合资助项目,U1406403号;国家自然科学基金资助项目,41276116号 中国科学院战略先导科技专项(A类);XDA11020601号
【分类号】：P734.4
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