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本文根据 4 0年间收集的综合观测资料、部分成果以及 1998/ 1999年本课题执行的 2个航次的调查和岸边监测 ,分析了渤海浮游植物生物量的年循环规律、水平分布的年际变化及长期变化。结合渤海水温、盐度、黄河径流量及营养盐浓度的变化 ,初步分析了原因。渤海为高生产力陆架海 ,每年有 2次生物量的高峰期 ,水华时间有 1个月的前后移动 ;生物量及其水平分布的年际变化大于 10年际变化。渤海温盐有增加趋势 ,无机氮浓度增加、磷酸盐浓度降低 ,河流输入变化只影响局部海域子系统 ,近岸海域的富营养化使得营养盐更多地消耗在近岸 ,而中央海区依然保持良好水质。物理系统的变化是该时空变化的重要原因之一。
Based on the comprehensive observation data and some achievements collected during the past 40 years and the survey of 2 voyages carried out by this project in 1998/99 and the shore monitoring, the annual cycle of phytoplankton biomass in the Bohai Sea is analyzed. The interannual variation of horizontal distribution And long-term changes. Based on the changes of water temperature, salinity, runoff and nutrient concentration in the Bohai Sea, the reasons were analyzed. The Bohai Sea is a high productive shelf sea. There are two peaks of biomass per year, and the blooming time moves back and forth within one month. The interannual variation of biomass and its horizontal distribution is larger than that of 10 years. In the Bohai Sea, the temperature and salinity of the Bohai Sea increased, the concentration of inorganic nitrogen increased, the concentration of phosphate decreased, and the change of river input affected only the partial sea area subsystem. The eutrophication in coastal waters made the nutrients consumed more in the nearshore while the central sea area remained Good water quality. Changes in the physical system is one of the important reasons for the changes in time and space.