| 摘要: |
| 1998年7月3–8日胶州湾女姑山增养殖海域发生一次中肋骨条藻(Skeletonema costatum)赤潮，对该次赤潮生消全过程环境因子变化的监测分析表明：该养殖海域表层水体溶解态无机氮、无机磷、可溶性铁和锰含量高，为赤潮的发生提供了必需的营养基础；6月30日–7月1日较强的降雨过程使水体在以后两天中形成了高温、低盐、富营养的环境，有利于中肋骨条藻的快速增殖并直接导致了赤潮的爆发；7月3–8日天气持续的高温和静风使赤潮得以维持，随后磷、硅的耗尽使赤潮逐步走向消亡。应用相关分析和主成分分析，研究了赤潮与环境因子的关系。结果表明，影响本次赤潮的重要环境因子有：盐度、水温、硅酸盐、磷酸盐。 |
| 关键词: 胶州湾, 中肋骨条藻, 环境因子, 统计分析 |
| DOI： |
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| 基金项目:国家自然科学基金九五重大项目, 39790110号;国家自然科学基金资助项目,49976029号。 |
附件 |
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| OUTBREAK OF SKELETONEMA COSTATUM RED TIDE AND ITS RELATIONS TO ENVIRONMENTAL FACTORS IN JIAOZHOU BAY |
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HUO Wen-Yi, YU Zhi-Ming, ZOU Jing-Zhong, SONG Xiu-Xian, HAO Jian-Hua
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Institute of Oceanology, The Chinese Academy of Sciences, Qingdao, 266071
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| Abstract: |
| A Skeletonema costatum red tide occurred on July 3–8, 1998 in Jiaozhou Bay. Variations of ecological factors and their influence upon red tide organisms were determined. Relatively high contents of nutrients, iron and manganese were responsible for the growth of Skeletonema costatum. The outbreak of the Skeletonema costatum red tide has a close relationship with the strong rain on June 30 and July 1, 1998. After the rain, warm, low-salinity and eutrophic water resulted in the rapid proliferation of Skeletonema costatum. In terms of the nutrients structure, compared with TIN (total inorganic nitrogen), the concentration of silicate and phosphate were relatively deficient. At the developing stage, the concentration of various nutrients and iron in surface water as well as TIN were declining due to the declination of nitrate. Among the three forms of TIN, it is possible that Skeletonema costatum preferred to absorb nitrate. At the blooming stage, the exhaustion of phosphate and silicate led to the death of Skeletonema costatum and disappearance of red tide. After the bloom disappeared, the contents of TIN and silicate returned rapidly to normal, but the concentration of phosphate still remained low-level and renormalized after a considerable time. Two statistical methods (correlation analysis and principal component analysis) were used to determine the mechanism of red tide. Combined results show that temperature, salinity, silicate and phosphate were the critical ecological factors affecting the occurrence of the Skeletonema costatum red tide. |
| Key words: Jiaozhou Bay, Skeletonema costatum, Environmental factors, Statistics analysis |
