文献类型：期刊文献

中文题名：湛江湾溶解有机物的时空变化特征及其环境驱动因素

英文题名：Spatiotemporal Variations of Dissolved Organic Matter and Its Environmental Drivers in Zhanjiang Bay

作者：郑月初[1];赵辉[1,2,3,4]

机构：[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(珠海),广东珠海519000;[3]广东省教育厅近海海洋环境变化合作研究中心,广东湛江524088;[4]广东海洋大学海岸带环境保护与生态修复研究中心,广东湛江524088

年份：2025

卷号：45

期号：6

起止页码：52

中文期刊名：广东海洋大学学报

外文期刊名：Journal of Guangdong Ocean University

收录：北大核心2023、、北大核心

基金：广东海洋大学研究生实践创新能力提升计划培育项目(2025-10)。

语种：中文

中文关键词：溶解有机物;光学特征;季节变化;平行因子分析;湛江湾

外文关键词：dissolved organic matter;optical characteristics;seasonal variation;parallel factor analysis;Zhanjiang Bay

中文摘要：【目的】揭示湛江湾溶解有机物(DOM)在不同季节的时空分布规律及其主要驱动机制,明确陆源输入与生物过程对DOM动态的综合作用。【方法】在湛江湾夏季与冬季开展现场采样,测定海水的理化参数与营养盐指标,利用三维荧光光谱(EEM)-平行因子分析(PARAFAC)分析DOM组分特征,并结合主成分分析(PCA)探讨DOM与环境因子的相关性。【结果】湛江湾上湾受径流影响显著,盐度低,营养盐及类腐殖质DOM富集;下湾受外海水入侵调控,自生源DOM信号增强。夏、冬两季DOM荧光强度均与盐度显著负相关(夏季r^(2)=0.836,冬季r^(2)=0.972,P<0.01),表明其时空变化主要受陆源输入和水动力条件驱动。夏季DOM变化受浮游植物生产与微生物降解过程的共同驱动,冬季则主要受物理混合过程控制。【结论】湛江湾DOM的时空动态呈现“陆源主导-生物过程协同”的双驱动特征。陆源输入决定DOM总体分布格局,生物与水动力过程在不同季节共同塑造其转化与迁移机制。

外文摘要：【Objective】To reveal the spatiotemporal distribution patterns and primary driving mechanisms of dissolved organic matter(DOM)in Zhanjiang Bay across different seasons,and to clarify the integrated effects of terrestrial inputs and biological processes on DOM dynamics.【Method】The seawater in Zhanjiang Bay during summer and winter was conducted on-site,and its physicochemical parameters and nutrient indicators were measured.The characteristics of DOM components in seawater were analyzed using excitation-emission matrix(EEM)fluorescence spectroscopy coupled with parallel factor analysis(PARAFAC),and the correlations between DOM and environmental factors were explored through principal component analysis(PCA).【Results】The upper bay of Zhangjiang Bay was significantly influenced by riverine inputs,characterized by low salinity and enrichment of nutrients and humic-like DOM,while the lower bay was regulated by external seawater intrusion with enhanced autochthonous DOM signals.DOM fluorescence intensity showed significant negative correlations with salinity in both seasons(r^(2)=0.836 in summer,and r^(2)=0.972 in winter,P<0.01),indicating that its spatiotemporal variations were primarily driven by terrestrial inputs and hydrodynamic conditions.DOM dynamics were co-driven by phytoplankton production and microbial degradation processes in summer,whereas they were predominantly controlled by physical mixing processes in winter.【Conclusion】The spatiotemporal dynamics of DOM in Zhanjiang Bay exhibit a dual-driving characteristic of“terrestrial dominance-biological process synergy”.Terrestrial inputs determine the overall DOM distribution pattern,while biological and hydrodynamic processes collectively shape its transformation and transport mechanisms across different seasons.