湛江湾秋季海表叶绿素a浓度时空分布特征及其与环境因子相关关系  

Spatio-temporal Distribution of Chl-a Concentration in Sea Surface and Its Correlation with Environmental Factors of Zhanjiang Bay in Autumn

作　　者：周敏 赵辉 ZHOU Min;ZHAO Hui(College of Chemistry and Environment,Guangdong Ocean University,Zhanjiang 524088,China;Guangdong Laboratory of South Ocean Science and Engineering,Zhanjiang 524088,China)

机构地区：[1]广东海洋大学化学与环境学院,广东湛江524088 [2]南方海洋科学与工程广东实验室,广东湛江524088

出　　处：《广东海洋大学学报》2021年第6期25-35,共11页Journal of Guangdong Ocean University

基　　金：国家自然科学基金项目(42076162);广东省自然科学基金项目(2020A1515010496)。

摘　　要：【目的】研究湛江湾秋季海表叶绿素a(Chl-a)和营养盐浓度的时空分布特征,探讨湾内环境因子对海域浮游植物Chl-a调控机制。【方法】根据湛江湾2017―2019年秋季(11月)的3个航次现场调查资料,通过主成分多元线性回归分析和Pearson相关分析,结合湾南和湾北营养盐结构对海域浮游植物Chl-a浓度分布特征进行综合分析。【结果】空间上,秋季湛江湾表层Chl-a浓度大致呈湾北低、湾南高,湾内向湾外递减的趋势,营养盐浓度呈湾北向湾南、湾内向湾外递减的趋势。时间上,溶解无机氮(DIN)平均浓度逐年缓慢上升,PO4-P浓度呈逐年下降趋势,SiO3-Si和Chl-a走势相同均先增加后降低。营养结构分析表明,海湾浮游植物生长的限制情况2017年主要为氮限制,2018年湾口为氮限制、湾内为磷限制,2019年主要为磷限制,湾口尤其严重。【结论】湛江湾湾北海域受沿岸径流和近岸陆源污染的影响,营养盐浓度较高、Chl-a浓度较低;湾南海域受不规则半日潮影响显著,受到人类活动干扰较少,营养盐浓度相对较低、Chl-a浓度相对较高。【Objective】To study the spatio-temporal distribution characteristics of concentration of chlorophyll a(Chl-a)and nutrients on the sea surface of Zhanjiang Bay in autumn,and explore the regulation mechanism of environmental factors on phytoplankton Chl-a in the Bay.【Method】Based on the field survey data of three voyages in Zhanjiang Bay in the autumn of 2017-2019,the distribution characteristics of phytoplankton Chl-a were analyzed by principal component multiple linear regression analysis and Pearson correlation analysis combined with the nutrient structure in the south and north of the Bay.【Result】Spatially,Chl-a on the surface layer of Zhanjiang Bay in autumn was lower in the north of the bay,higher in the south of the bay,and decreasing inside to outside the bay,while nutrients were decreasing from the north to the south and from inside to the outside of the bay.In terms of time,the average concentration of dissolved inorganic nitrogen(DIN)increased slowly year by year,and the concentration of PO4-P decreased year by year,while SiO3-Si and Chl-a showed the same trend,both increased first and then decreased.The nutrient structure analysis of Zhanjiang Bay showed that the main limitation of phytoplankton growth was nitrogen in 2017,nitrogen restriction in the estuary and phosphorus restriction in the bay in 2018,and phosphorus restriction in 2019,especially in the estuary.【Conclusion】The northern part of Zhanjiang Bay is mainly affected by coastal runoff and nearshore land-based pollution,with high nutrient concentration and low Chl-a concentration,while the south of Zhanjiang Bay was significantly affected by irregular semidiurnal tide,less disturbed by human activities,relatively lower nutrient concentration and relatively higher Chl-a concentration.

关 键 词：CHL-A 营养盐 相关关系 富营养化 湛江湾 

分 类 号：P76[天文地球—海洋科学]