Nanjing Institute of Environment Sciences, Ministry of Ecology and Environment, Nanjing 210023, China.
School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Int J Environ Res Public Health. 2022 Jul 28;19(15):9219. doi: 10.3390/ijerph19159219.
Dissolved organic matter (DOM) is a central component in the biogeochemical cycles of marine and terrestrial carbon pools, and its structural features greatly impact the function and behavior of ecosystems. In this study, the Wanggang River, which is a seagoing river that passes through Yancheng City, was selected as the research object. Three-dimensional (3D) fluorescence spectral data and UV−visible spectral data were used for component identification and source analysis of DOM based on the PARAFAC model. The results showed that the DOM content of the Wanggang River during the dry season was significantly higher than during the wet season; the DOM content increased gradually from the upper to lower reaches; the proportion of terrigenous components was higher during the wet season than during the dry. UV−Vis spectral data a280 and a355 indicated that the relative concentrations of protein-like components in the DOM of the Wanggang River were higher than those of humic-like components, and the ratio of aromatic substances in the DOM of the Wanggang River water was higher during the wet season. The DOM in the Wanggang River was dominated by protein-like components (>60%), and the protein-like components were dominated by tryptophan proteins (>40%). This study showed that the temporal and spatial distributions of DOM in rivers can be accurately determined using 3D fluorescence spectroscopy combined with the PARAFAC model. This provides useful insight into the biogeochemical process of DOM in rivers of coastal areas.
溶解有机质（DOM）是海洋和陆地碳库生物地球化学循环的核心组成部分，其结构特征对生态系统的功能和行为有很大影响。本研究选取通过盐城市的入海河流——王港河作为研究对象，利用三维荧光光谱数据和紫外可见光谱数据，基于平行因子分析（PARAFAC）模型对 DOM 的组分进行识别和来源分析。结果表明，王港河枯水期 DOM 含量显著高于丰水期；DOM 含量从上游到下游逐渐增加；丰水期陆源组分比例高于枯水期。UV-Vis 光谱数据 a280 和 a355 表明，王港河 DOM 中类蛋白组分的相对浓度高于类腐殖质组分，丰水期王港河水体 DOM 中芳香物质的比例较高。王港河 DOM 以类蛋白组分为主（>60%），其中类蛋白组分主要由色氨酸蛋白组成（>40%）。本研究表明，利用三维荧光光谱结合 PARAFAC 模型可以准确测定河流 DOM 的时空分布，为沿海地区河流 DOM 的生物地球化学过程提供了有用的见解。
