Distribution characteristics and source analysis of dissolved organic matter with different molecular weights in the coastal waters of Zhejiang Province

文献类型： 外文期刊

第一作者： Sun, Xiumei

作者： Sun, Xiumei;Song, Suping;Hao, Qing;Zhu, Jian;Li, Tiejun;Guo, Yuanming;Song, Suping;Yang, Chenghu

作者机构：

关键词： Coastal waters; Dissolved organic matter; Ultrafiltration; Molecular weight; Spectral characteristics; EEM-PARAFAC

期刊名称：MARINE ENVIRONMENTAL RESEARCH （ 影响因子：3.2； 五年影响因子：3.3 ）

ISSN： 0141-1136

年卷期： 2025 年 205 卷

页码：

收录情况： SCI

摘要： Dissolved organic matter (DOM) is a crucial component of the carbon cycle in ecosystems, with its composition, functional groups, and chemical structures varying significantly depending on source and molecular weight (MW). In this study, the content, composition characteristics, and sources of DOM in the coastal waters of Zhejiang Province were investigated using total organic carbon analysis, ultraviolet-visible (UV-Vis) absorption spectroscopy, and excitation-emission matrix (EEM) spectroscopy combined with parallel factor analysis (PARAFAC). The results indicated regional differences in the content and composition of DOM. Hangzhou Bay exhibited the highest DOM content (1.81 +/- 0.06) mg/L, fluorescence intensity (F-max), and proportion of proteinlike components (83.30-92.68%). Three PARAFAC fluorescence components (C1, C2, C3) were identified in each region, classified into protein-like and humic-like substances. UV and fluorescence characteristic parameters showed that the primary sources of DOM differed among the regions: Hangzhou Bay was significantly influenced by anthropogenic sources, while Yueqing Bay was more affected by terrestrial inputs. However, allochthonous inputs were important in all regions, primarily consisting of terrestrial materials transported by rivers, urban wastewater, and agricultural runoff. Ultrafiltration divided the DOM into four MW fractions: 30 kDa-0.45 mu m, 10-30 kDa, 1-10 kDa, and <1 kDa. It was found that the DOM in each region predominantly consisted of low MW fractions (<1 kDa), accounting for 43.35-45.02%, with the proportion decreasing as MW increased. In the same investigated sea area, <1 kDa and <0.45 mu m fractions exhibited similar fluorescence characteristics; the DOM in the 1-10 kDa range showed relatively higher Fmax values, indicating the highest fluorescent DOM (FDOM) content in this fraction. This study highlighted the importance of anthropogenic and terrestrial inputs on DOM in coastal waters.

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