束乐乐, 杨红, 王春峰, 吴建辉. 长江口门附近水体溶解性有机质的荧光组分特征[J]. 海洋环境科学, 2023, 42(2): 176-184, 192. DOI: 10.12111/j.mes.2022-x-0064
引用本文: 束乐乐, 杨红, 王春峰, 吴建辉. 长江口门附近水体溶解性有机质的荧光组分特征[J]. 海洋环境科学, 2023, 42(2): 176-184, 192. DOI: 10.12111/j.mes.2022-x-0064
SHU Le-le, YANG Hong, WANG Chun-feng, WU Jian-hui. Characteristics of fluorescent components of dissolved organic matter in water near the mouth of the Yangtze River[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2023, 42(2): 176-184, 192. DOI: 10.12111/j.mes.2022-x-0064
Citation: SHU Le-le, YANG Hong, WANG Chun-feng, WU Jian-hui. Characteristics of fluorescent components of dissolved organic matter in water near the mouth of the Yangtze River[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2023, 42(2): 176-184, 192. DOI: 10.12111/j.mes.2022-x-0064

长江口门附近水体溶解性有机质的荧光组分特征

Characteristics of fluorescent components of dissolved organic matter in water near the mouth of the Yangtze River

  • 摘要: 本研究利用三维荧光光谱(3DEEMs)结合平行因子分析(PARAFAC)模型,解析了2020年8月-2021年4月4个季节长江口门附近海域水体溶解性有机质(dissolved organic matter,DOM)的时空变化特征以及组成结构特征。结果表明:研究区域溶解性有机碳(dissolved organic carbon,DOC)的浓度秋季(2.76 mg/L)最大,夏季(2.56 mg/L)次之,春季(1.96 mg/L)和冬季(2.11 mg/L)的浓度较低且二者差异不显著;DOC浓度的区域分布表征为南支北港(3.20 mg/L)>北支(2.21 mg/L)>北港北沙(1.82 mg/L)。水体中的DOM可分为4个组分,分别为芳香氨基酸组分C1、陆源及海洋源类腐殖质组分C2、类色氨酸组分C3以及海洋源类腐殖质组分C4,组分C1、C2和C3间具有同源性,其中C1和C2占主体地位,C3次之,C4占比最小;组分C1和C4的占比随离岸距离的增大呈增大的趋势,而组分C3呈递减趋势;组分C1冬季占比最大,夏季最小,组分C3与C1占比情况相反。荧光特征参数的分析结果表明,水体DOM大部分为陆源输入和水生生物活动的内源共同作用,且自生源特征较显著,腐殖化特征较弱,一定程度上能表明研究区域水体活性较强,水质状况较好。

     

    Abstract: In this study, three dimensional excitation-emission matrix spectra (3DEEMs) was combined with parallel factor analysis (PARAFAC) model, we analyzed the spatial and temporal variation and composition of dissolved organic matter (DOM) in the water near the mouth of the Yangtze River Estuary from August 2020 to April 2021. The results show that: In the study area, dissolved organic carbon (DOC) concentration was the highest in autumn (2.76 mg/L), followed by summer (2.56 mg/L), and was lower in spring (1.96 mg/L) and winter (2.11 mg/L), with no significant difference between them; The regional distribution of DOC concentration was characterized asthe southern branch Beigang (3.20 mg/L) > the northern branch (2.21 mg/L) > the northern branch Beisha (1.82 mg/L). DOM in the water can be divided into four components, namely aromatic amino acid component C1, terrestrial and marine humus component C2, tryptophan-like component C3 and humus-like component C4 of marine origin C4, Components C1、C2 and C3 have homology, among which C1 and C2 occupy the dominant position, C3 takes the second place, and C4 occupies the smallest proportion; The proportions of C1 and C4 increased with the increase of offshore distance, while C3 decreased; The proportion of component C1 was the largest in winter and the smallest in summer, and the proportion of component C3 and C1 was opposite. The analysis results of fluorescence characteristic parameters showed that most of the DOM in the water was the joint action of terrigenous input and aquatic biological activities, and the authigenic characteristics were significant, while the humification characteristics were weak. To some extent, it indicated that thewater body in the study area was highly active and the water quality was good.

     

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