枯水期灞河城市段底质DOM的空间分布、光谱特征及来源解析

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Abstract The composition distribution, spectral characteristics and sources of dissolved organic matter (DOM) in the sediments in the urban section of Bahe River in the dry season were investigated using ultraviolet spectroscopy and three-dimensional fluorescence spectroscopy combined with PARAFAC. The results show that the concentrations of CDOM and DOM in the sediments in the study area during the dry season were 2.76~11.05m^-1 and 0.09~0.34mg/g, respectively, and decreased with an increase in sampling depth; and the components of DOM included three types of humus-like and two types of proteinoids. The Fn280 value at each point was higher than Fn355 value, indicating its composition was mainly proteinoids. The E₂/E₃, E₃/E₄, HIX, FI, BIX, and S_R values of DOM were 2.53~4.90, 3.14~4.15, 1.31~3.48, 1.74~2.35, 0.73~1.77, and 0.92~1.47, respectively. The molecular weight of DOM in the downstream was greater than that in the upstream. DOM mainly came from the endogenous products of biological or bacterial activities, and the humus substances was mainly fulvic acid. And the fluorescence intensities of two types of humus-like at 265/448nm and 250/448nm were significantly correlated (r=0.951, P<0.01). HIX was negatively correlated with E₃/E₄ and BIX, respectively (r=-0.663, P<0.01 and r=-0.514, P<0.05), and BIX was positively correlated with E₃/E₄ and the fluorescence intensity of proteinoids, respectively (r=0.668 and 0.769, P< 0.01). The DOM with more endogenous inputs contained more proteinoids but its humification was weaker. Obviously, the DOM in the sediments in the urban section of the Bahe River in the dry season came mainly from endogenous sources, was proteinoids-dominated and had a low degree of humification, which could provide reference for the formulation of river governance measures.

Key words： sediment dissolved organic matter fluorescent characteristic PARAFAC source space distribution

Received: 08 October 2022

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X132

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	YANG Yi
	DONG Cheng-xuan
	WANG Ping-ping
	HE Yan-xin
	HOU Yan-hui

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YANG Yi,DONG Cheng-xuan,WANG Ping-ping等. Spatial distribution, spectral characteristics and sources of sedimentary dissolved organic matter in the urban section of the Bahe River in dry season[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2347-2353.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2347

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