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赤潮过程中塔玛亚历山大藻(Alexandriumtamareme)C、N稳定同位素组成的变化规律

DOI: 10.13634/j.cnki.mes20150524, PP. 783-787

Keywords: 塔玛亚历山大藻,营养盐,稳定同位素

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Abstract:

为了探索赤潮监测预防的新思路和方法,本研究选取典型赤潮藻(塔玛亚历山大藻Alexandriumtamareme)作为实验藻种,模拟一次完整的赤潮形成过程,测定重要监测指标(生物量、营养盐浓度)的变化,找出稳定同位素特征值与之相关变化规律。实验结果表明,藻种生长过程可明显分为四个阶段:适应期、对数生长期、稳定生长期及衰亡期;N、P浓度随培养时间呈下降趋势,与生物量的变化有很好的相关性,但在生长过程中几乎不吸收硅酸盐。在一次完整的赤潮发生过程中,C稳定同位素组成(δ13C值)随时间显示出减小趋势,而N稳定同位素组成(δ15N值)值则显示增大趋势。因此,赤潮藻的C和N稳定同位素组成为赤潮监测提供了可能的新指标和新方法。

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