珠江口沉积物溶解性有机质来源及光谱特征的空间变化

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关键词：珠江口；沉积物；溶解性有机质（DOM）；光谱特征；空间变化 中图分类号：X145；P734 文献标识码：A 文章编号：1008-9500(2025)11-0155-03 DOI: 10.3969/j.issn.1008-9500.2025.11.048

Source and Spatial Variation of Spectral Characteristics of Dissolved Organic Matter in the Pearl River Estuary Sediments

ZHANG Ziqian (Shanghai Ocean University, Shanghai 201306, China)

Abstract: The Pearl River Estuary isan important estuary in southern China,Disslved Organic Matter (DOM) in its sediment has an important impact on regional carbon cycle and ecological environment.The main sources of DOM in sediments fromthePearlRiver estuaryareelaborated,andthespectral characteristicsofDOMinsedimentsaredetected through UV visible absorption spectroscopyand 3D fluorescence spectroscopy,thus analyzing the spatial variation pattern of DOM.The experimental resultsshow that from the intraoral area to the extraoral area,the source of DOM gradually transitions from terrstrial tooceanicsources,molecularweightandaromatizationdegre graduallydecrease,itisspeulated thathydrodynamicconditions,sedimentproperties,andbiogeochemicalprocessesarethemain factors affectingthespatial distribution of DOM.

KeyWords: PearlRiverEstuary;sediments;DisolvedOrganic Mater(DOM);spectral characteristics;spatialvariation

1珠江口沉积物DOM的来源

1.1陆源输入

连接珠江流域和南海的珠江口是我国南方重要的河口之一，具有重要的生态和经济价值。（剩余4336字）