DOM Fluorescence Characteristics and Sources in Different Regions of Dongting Lake

doi:10.16258/j.cnki.1674-5906.2021.12.012

Ecology and Environment ›› 2021, Vol. 30 ›› Issue (12): 2370-2379.DOI: 10.16258/j.cnki.1674-5906.2021.12.012

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DOM Fluorescence Characteristics and Sources in Different Regions of Dongting Lake

MA Feiyang¹(), FAN Tuantuan¹, SUN Xiaoping², MING Junde¹, WANG Shitong¹, ZHANG Yinghao¹, YAO Xin¹^,^*()

1. School of Environment and Planning, University of Liaocheng, Liaocheng 252059, China
2. Liaocheng Ecological Environment Monitoring Center of Shandong Province, Liaocheng 252000, China

Received:2021-03-06 Online:2021-12-18 Published:2022-01-04
Contact: YAO Xin

洞庭湖不同湖区水体DOM的荧光特征及来源

马飞扬¹(), 樊团团¹, 孙小平², 明峻德¹, 王世同¹, 张英豪¹, 姚昕¹^,^*()

1.聊城大学环境与规划学院,山东聊城 252059
2.山东省聊城生态环境监测中心,山东聊城 252000

通讯作者: 姚昕
作者简介:马飞扬（1996年生）,女,硕士研究生,主要研究方向为湖泊有机质迁移转化。E-mail: 1315471930@qq.com
基金资助:
国家自然科学基金项目(41977322);国家自然科学基金项目(41901120);聊城大学大学生创新创业训练项目(CXCY2020Y035)

Abstract

Abstract:

Analyses of the sources, fluorescence characteristics and environmental behavior for the dissolved organic matter (DOM) in different regions of Dongting Lake in summer season are of vital significance to the pollution sources detections, water pollution preventions and water transportation safety. A combined approach of parallel factor analysis (PARAFAC), synchronous fluorescence spectroscopy (SF) and ultraviolet fluorescence spectroscopy (UV—Vis) was employed to elucidate sources and fluorescence characteristics of DOM in Dongting Lake in summer. A total of 4 fluorescence components, including fulvic-like components C1 and C2, protein-like component C3 and humic-like component C4 were obtained by PARAFAC and the DOM in Dongting Lake was dominated by fulvic-like substances (C1 and C2). As indicated by geostatistical analysis, the DOM concentration in Dongting Lake was mainly affected by structural factors. Results of absorption parameters (A₂₅₀/A₃₆₅, a₂₅₄, A_SUV, A_SUV-260) combined with fluorescence spectral index (FI, BIX and HIX) showed that DOM in Dongting Lake was mainly derived from endogenous inputs, and differences for the correlation analysis between fluorescence components and water quality parameters existed between the East, South and West Dongting Lake. Correlation analysis showed a significant correlation among four components in Dongting Lake (P<0.01), which indicated that the sources of DOM were similar from the East, South and West Dongting Lake. The relatively high humic and protein-like substances in the DOM of the East Dongting Lake may be related to the main-stream system during the wet season, the natural conditions and the surrounding human activities.

Key words: dissolved organic matter (DOM), parallel factor analysis model, ultraviolet-visible absorption spectrum, spectral characteristics, Dongting Lake

摘要：

解析夏季洞庭湖不同湖区溶解性有机质（DOM）的来源、荧光特征及环境行为对湖泊水体污染来源监测、水环境污染防治及安全调水具有十分重要的意义。利用DOM Fluor工具运行平行因子分析模型（PARAFAC）与同步荧光光谱（SFS）和紫外荧光光谱（UV-Vis）结合探究夏季洞庭湖水体DOM来源及荧光特性。水体中DOM一共含有4类荧光组分：C1、C2（类富里酸）,C3（类蛋白）,C4（类胡敏酸）。其中,洞庭湖DOM以类富里酸物质（C1、C2）为主。地统计分析结合荧光光谱指数（FI、BIX、HIX）分析结果表明,洞庭湖水体DOM主要以内源输入为主,受结构性因素影响较为强烈,洞庭湖4类组分均为极显著正相关（P<0.01）,说明洞庭湖东、南、西3个湖区联系密切,各湖区水体DOM具有较高同源性。东、南、西3个湖区的荧光组分与各水质参数的相关分析结果不尽相同,东洞庭湖水体DOM中较高的类腐殖质和类蛋白物质与丰水期干流水系、自然条件及周围人类活动息息相关。

关键词: 溶解性有机质（DOM）, 平行因子分析模型, 紫外-可见吸收光谱, 光谱特征, 洞庭湖

CLC Number:

MA Feiyang, FAN Tuantuan, SUN Xiaoping, MING Junde, WANG Shitong, ZHANG Yinghao, YAO Xin. DOM Fluorescence Characteristics and Sources in Different Regions of Dongting Lake[J]. Ecology and Environment, 2021, 30(12): 2370-2379.

马飞扬, 樊团团, 孙小平, 明峻德, 王世同, 张英豪, 姚昕. 洞庭湖不同湖区水体DOM的荧光特征及来源[J]. 生态环境学报, 2021, 30(12): 2370-2379.

Figures/Tables 9

Fig. 1 Location of sampling sites in Dongting Lake

Fig. 2 Spatial distribution of A250/A365 (a), a254 (b), ASUV (c), ASUV-260 (d), FI (e), BIX (f), HIX (g), Fmax (h) and C1 (i), C2 (j), C3 (k), C4 (l) in Dongting Lake in summer

Table 1 Comparison of absorption parameters for A250/A365, a254, ASUV, ASUV-260, ρ(COD), ρ(DOC) in three lakes of Dongting

Regions	Parameters	A₂₅₀/A₃₆₅	a₂₅₄/(mg·L^-1)	A_SUV/(L·mg^-1·m^-1)	A_SUV-260/(L·mg^-1·m^-1)	ρ_(COD)/(mg·L^-1)	ρ(DOC)/(mg·L^-1)
The East Dongting	Mean (Range)	5.68±0.34 (3.34-6.86)	16.68±2.60 (10.63-28.88)	2.72±0.10 (2.35-3.24)	2.52±0.09 (2.18-2.99)	4.12±0.49 (2.89-6.60)	6.03±0.81 (4.10-9.45)
The East Dongting	Coefficient of variation	0.18	0.11	0.11	0.11	0.36	0.40
The South Dongting	Mean (Range)	5.06±0.23 (4.50-5.94)	10.91±0.35 (9.55-11.92)	2.71±0.04 (2.58-2.86)	2.52±0.04 (2.41-2.64)	2.80±0.11 (2.37-3.06)	4.02±0.12 (3.70-4.55)
The South Dongting	Coefficient of variation	0.11	0.04	0.04	0.04	0.09	0.07
The West Dongting	Mean (Range)	5.33±0.17 (4.92-5.73)	10.67±0.64 (9.52-12.26)	2.51±0.05 (2.43-2.66)	2.32±0.05 (2.23-2.47)	2.83±0.12 (2.56-3.06)	4.24±0.17 (3.90-4.61)
The West Dongting	Coefficient of variation	0.06	0.05	0.04	0.05	0.08	0.08

Fig. 3 Synchronous fluorescence spectra of DOM from East Dongting Lake (a), South Dongting Lake (b), and West Dongting Lake (c)

Fig. 4 Distributions of the contents (a) and percentages (b) of DOM fractions in East Dongting Lake (DT1-DT9), South Dongting Lake (DT10-DT15) and West Dongting Lake (DT16-DT19)

Fig. 5 Four different fluorescence component identified by 3D EEM-PARAFAC model

Fig. 6 Correlation analysis between fluorescence components and water quality parameters of DOM in Dongting Lake

Fig. 7 Correlation analysis between four groups of fluorescence components and main water quality parameters in East Dongting Lake

Fig. 8 Correlation analysis between four groups of fluorescence components and main water quality parameters in South Dongting Lake

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DOM Fluorescence Characteristics and Sources in Different Regions of Dongting Lake

洞庭湖不同湖区水体DOM的荧光特征及来源

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