枯水期西安水体中DOM的组成、性质和来源

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Abstract Due to the diversity of dissolved organic matter (DOM) in regional water bodies, 3D fluorescence spectroscopy combined with parallel factor analysis and UV spectroscopy techniques were used to explore the differences in fluorescence components, sources, and molecular properties of DOM in the water bodies in the dry season in Xi'an. The results show that the DOC of the water bodies in the dry season was 2.66~9.48mg/L. DOM contained two kinds of humus-like (the average value of the total contribution rate was more than 70%) and one kind of proteinoids-like, with fulvic acid as the main matter. The main source was biological, with strong or very strong characteristics of autogenesis and weak degree of overall humification. The relative content and degree of benzene ring substitution of DOM were relatively high in the lower reaches of Chanhe River and Bahe River, Zaohe River, Linhe River, Hucheng Moat, and Caoyun Canal and relatively low with the relatively high molecular weight in Heihe River. The relative molecular weight and proportion of fulvic acid content of DOM in the lower reaches of Bahe, Zaohe, and Fenghe rivers were smaller than those in the upper reaches. The DOC demonstrated a pairwise positive correlation with UV₂₅₄, α₃₅₅, or the total fluorescence intensity (r=0.850~0.939, P<0.01). The molecular properties and sources of DOM in the dry season demonstrated a spatial heterogeneity, which belonges to the humus-like dominant type. The UV₂₅₄, α₃₅₅ and total fluorescence intensity of DOM can be used to estimate relative content of DOM. This study can provide reference for developing effective water environment management measures.

Key words： DOM fluorescence characteristics molecular characteristics source space distribution

Received: 14 June 2023

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	Articles by authors
	YANG Yi
	DONG Cheng-xuan
	ZHU Yu-qiang
	SHU Qi-lin
	LIU Wei
	WU Qin-yun

Cite this article:

YANG Yi,DONG Cheng-xuan,ZHU Yu-qiang等. Components, properties and sources of DOM in Xi'an water bodies in dry season[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(2): 953-960.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I2/953

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