罗珮珍,牛丽霞,罗向欣,蔡华阳,杨清书

• 1:中山大学海洋科学学院
• 2:中山大学海洋工程与技术学院
• 3:广东省海岸与岛礁工程技术研究中心

摘要(Abstract)：

【目的】分析珠江磨刀门河口浮游植物叶绿素a及其驱动因子的潮周期变化,并揭示叶绿素a的环境影响机制。【方法】基于珠江磨刀门河口2017年枯季(1月13-20日)水文水质多要素同步观测数据,采用主成分分析(PCA)和结构方程模型(SEM)确定浮游植物叶绿素a与多个环境因子的关系并量化各因子的驱动作用。【结果】磨刀门水道浮游植物叶绿素a浓度变化范围为0.77～10.92μg/L,口门处变化为0.70～9.01μg/L,磨刀门河口动力驱动下浮游植物叶绿素a的潮周期差异显著。盐度、含沙量和氮磷营养盐亦随潮汐涨落差异显著,而水温无明显潮周期变化。【结论】外海水团对氮营养盐的稀释混合作用强于磷营养盐,而悬浮泥沙对磷营养盐的吸附作用强于氮营养盐。与氮营养盐相比,溶解态磷相对不足,限制磨刀门河口浮游植物的生长。径流(营养盐、悬沙等为代表)、潮流(盐度为代表)对河口浮游植物的影响机制不同,其中氮磷营养盐和水温起着直接作用,而悬沙和盐度间接影响浮游植物叶绿素a的变化。

关键词(KeyWords)： 浮游植物叶绿素a;河口动力;氮磷营养盐;磨刀门河口

Abstract:

Keywords:

基金项目(Foundation): 广东省水利科技创新项目(2016-20);; 国家自然科学基金青年基金项目(51709289)

作者(Author): 罗珮珍,牛丽霞,罗向欣,蔡华阳,杨清书

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