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根据2006年7月至9月“海监49号”科学考察船夏季航次的调查数据,分析了长江口及邻近海域水体中磷形态的平面分布特征及其影响因素,结果表明,调查海域水体各种形态磷平均浓度均为底层高于表层,并呈现出由河口向邻近海域降低的趋势。杭州湾及最大混浊带部分区域水体中以颗粒态磷为主,且颗粒态无机磷为磷的主要存在形态;长江口门及江苏东部近海区域水体中以溶解态磷为主,溶解态无机磷为磷的主要存在形态;舟山群岛东部外海区表层水体以溶解态磷为主,溶解态有机磷为磷的主要存在形态,而底层水体中溶解态磷浓度略高于颗粒态磷,以溶解态无机磷为磷的主要存在形态。水体中颗粒态无机磷与颗粒态有机磷、颗粒总磷与总磷、总磷与悬浮颗粒物均呈非常显著的正相关,说明悬浮颗粒物是颗粒态磷的主要影响因素。调查海域外海区域绝大部分站位水体中溶解态无机磷表层浓度接近或小于浮游植物生长限制的动力学最低阈值,是磷限制或潜在的磷限制区域。
According to the survey data of “HaiYian 49” scientific voyage summer voyage from July to September 2006, the plane distribution of phosphorus forms in the Yangtze Estuary and its adjacent sea area and its influencing factors were analyzed. The results showed that the survey area The average concentration of various forms of phosphorus in the water body is higher than the surface layer of the bottom, and showed a downward trend from the estuary to the adjacent sea. In the Hangzhou Bay and the part of the area with the largest turbid zone, particulate phosphorus is dominant, and particulate inorganic phosphorous is the main form of phosphorus. In the Changjiang Estuary and the waters in the eastern Jiangsu coastal waters, dissolved phosphorus is dominant, dissolved inorganic phosphorus Is the main form of phosphorus. The surface water bodies in the eastern part of Zhoushan Archipelago are dominated by dissolved phosphorus, while the dissolved organic phosphorus is the main form of phosphorus. The dissolved phosphorus concentration in the bottom water is slightly higher than that in granular phosphorus, Inorganic phosphorus is the main form of phosphorus. Particulate phosphorus, particulate total phosphorus and total phosphorus, total phosphorus and suspended particulate matter in water bodies showed a very significant positive correlation, indicating that suspended particulate matter is the main impact of particulate phosphorus. The lowest kinetic threshold of dissolved inorganic phosphorus in the waters of most stations in the survey sea area is close to or less than the limit of phytoplankton growth and is the limit of phosphorus or the potential phosphorus limitation area.