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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摘要利用紫外光谱和三维荧光光谱技术结合平行因子分析,对枯水期灞河城市段底质DOM的组成分布、光谱特征及来源进行解析.结果表明,枯水期灞河城市段底质CDOM和DOM浓度分别为2.76~11.05m^-1和0.09~0.34mg/g,随采样深度增大,CDOM和DOM浓度降低.DOM组分包括3种类腐殖质和2种类蛋白质,各点处Fn280值均高于Fn355值,其组成以类蛋白质为主. DOM的E₂/E₃、E₃/E₄、HIX、FI、BIX和S_R值分别为2.53~4.90, 3.14~4.15, 1.31~3.48, 1.74~2.35, 0.73~1.77和0.92~1.47,可得研究区域内下游DOM分子量大于上游,DOM主要来自于生物或细菌活动产生的内源,腐殖质以富里酸为主.相关性分析显示,位于265/448nm和250/448nm处的两种类腐殖质荧光强度显著正相关(r=0.951,P<0.01),HIX分别与E₃/E₄和BIX呈负相关(P<0.01和P<0.05),BIX分别与E₃/E₄和类蛋白物质荧光强度呈正相关(r=0.668、0.769,P<0.01),内源输入较多的DOM中类蛋白物质含量较多,DOM腐殖化程度较弱.综上可得,枯水期灞河城市段底质DOM主要来自内源,属于类蛋白质主导型且腐殖化程度较低,可为河流治理措施的制定提供参考与依据.

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关键词 ：底质, DOM, 荧光特性, 平行因子分析, 来源, 空间分布

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

收稿日期: 2022-10-08

PACS:

X132

基金资助:国家自然科学基金资助项目(21407119);陕西省自然科学基础研究计划项目(2021JM-375);西安建筑科技大学自然科学专项(ZR21019)

通讯作者: 杨毅,副教授,yangyi@xauat.edu.cn E-mail: yangyi@xauat.edu.cn

作者简介: 杨毅(1976-),女,辽宁铁岭人,副教授,博士,西安建筑科技大学副教授,主要从事污水控制技术、环境化学及固体废物资源化.发表论文20余篇.yangyi@xauat.edu.cn.

引用本文:

杨毅, 董承璇, 王萍萍, 何延新, 侯彦辉. 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[J]. 中国环境科学, 2023, 43(5): 2347-2353. YANG Yi, DONG Cheng-xuan, WANG Ping-ping, HE Yan-xin, HOU Yan-hui. Spatial distribution, spectral characteristics and sources of sedimentary dissolved organic matter in the urban section of the Bahe River in dry season. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2347-2353.

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