胶州湾浮动弯角藻赤潮生消动态过程及其成因分析

Analysis of dynamic process and the causes of Eucampia zoodiacus red tide in Jiaozhou Bay

分析了１９９９年６月８日－１５日胶州湾东北养殖水域浮动弯角藻赤潮生消动态过程中各环境因子的变化 及赤潮成因。结果表明，该海域无机营养盐含量较高，为赤潮的发生提供了必需的营养物质；赤潮发生前天气 闷热无雨，有利于浮动弯角藻的快速生长繁殖；赤潮形成至发展期该海域盛行南风，浮动弯角藻的物理性聚集 对赤潮迅速形成有重要影响；赤潮维持阶段天气稳定，赤潮持续时间较长；最终无机磷、活性硅酸盐的耗尽使赤 潮逐步走向消亡。

A red tide caused by Eucampio zoodiacus, a kind of coastal eutythermal diatom, occurred from June 8 to June 15, 1999, in mariculture area of Jiaozhou Bay. Variations of abiotic factors were evaluated and the reasons for this red tide were analyzed. Results from in-situ monitoring indicated that the inorganic nutrients average concentration of nitrogen, phosphate and silicate were much higher than that in whole Jiaozhou Bay. The heavier eutrophic water provided macro-nutrients basis that was essential for algal growth and proliferation. The hot and muggy weather before red tide occurrence resulted in high water temperature that created favorable conditions for phytoplankton growth. The southern wind prevailing during blooming had great effects on physical conglomeration of algal cells. The stable synoptic condition made this red tide last for a relatively long time. After June 15, the red tide disappeared gradually due to the depletion of phosphate and silicate.