南湖水系溶解性有机质来源及时空分布特征

张博; 高建文; 范绍锦; 王书航; 郑朔方; 姜霞

doi:10.12153/j.issn.1674-991X.20200066

南湖水系溶解性有机质来源及时空分布特征

doi: 10.12153/j.issn.1674-991X.20200066

张博^1,2,,
高建文³,
范绍锦^1,2,
王书航^1,2,*, ,,
郑朔方^1,2,
姜霞^1,2

1.
湖泊水污染治理与生态修复技术国家工程实验室,中国环境科学研究院
2.
国家环境保护湖泊污染控制重点实验室,中国环境科学研究院
3.
中交上海航道勘察设计研究院有限公司

详细信息

作者简介:
张博(1987—),女,工程师,硕士,主要从事湖泊水污染治理与水环境管理研究,zhangbo@craes.org.cn

通讯作者:
王书航 E-mail: wangsh@craes.org.cn

中图分类号: X524
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- 被引次数: 0
出版历程
- 收稿日期: 2020-03-30
- 刊出日期: 2020-11-20

Origin and spatial-temporal distribution characteristics of dissolved organic matter in Nanhu Lake water system

ZHANG Bo^{1,2
,},
GAO Jianwen³,
FAN Shaojin^1,2,
WANG Shuhang^{1,2,*
, ,},
Zheng Shuofang^1,2,
JIANG Xia^1,2

1.
National Engineering Laboratory for Lake Pollution Control and Ecological Restoration,Chinese Research Academy of Environmental Sciences
2.
State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences
3.
CCCC Shanghai Waterway Engineering Design and Consulting Co., Ltd.

More Information

Corresponding author: WANG Shuhang E-mail: wangsh@craes.org.cn

摘要

摘要: 加强南湖及周边水体(简称南湖水系)水环境治理对于改善杭嘉湖水网水质具有重要意义。采用紫外-可见吸收和三维荧光光谱技术,分析2018—2019年南湖水系在不同水期溶解性有机物(DOM)的分布状况、荧光特征及其组分与主要水质参数的相关性,以探究南湖水系DOM的组成、来源及生物有效性。结果表明:南湖水系DOM浓度在枯水期(5.63 mg/L)显著高于丰水期(4.81 mg/L);三维荧光光谱解析出3个类蛋白峰和1个类腐殖质峰,其中类蛋白峰对总荧光强度的贡献率为90.80%,且枯水期贡献率高于丰水期;DOM及其组分的分布具有空间差异性,呈北部、西部高,东南部低的趋势,荧光指数表现为枯水期(1.75)高于丰水期(1.70);腐质化指数与生源指数均显示,南湖水系有机质的生物可利用性较高,且枯水期高于丰水期;水体DOM与氨氮和有机氮之间呈显著正相关。南湖水体中DOM主要来源于城市生活源排放和内源释放,且西北部区域存在污水直排或管网渗漏现象,控制外源DOM输入可有效控制水系中氮的水平。
- 南湖 /
- 溶解性有机质 /
- 荧光组分 /
- 来源 /
- 生物有效性
Abstract: Strengthening the water environmental governance in Nanhu Lake and its surrounding waters is significant for improving the water quality in the Hangzhou-Jiaxing water net. Using ultraviolet-visible absorption and three-dimensional fluorescence spectroscopy, the distribution of DOM, fluorescence characteristics, and the correlation between components and major water quality parameters were analyzed in different water stages of Nanhu Lake water system in 2018-2019, which offered further insight into the components, resources, and bioavailability of DOM in Nanhu Lake water system. Experimental results showed that DOM concentration of Nanhu Lake water system in dry season (5.63 mg/L) was significantly higher than that in wet season (4.81 mg/L). 3 protein-like peaks and 1 humus-like peak were resolved from three-dimensional fluorescence spectrum of DOM in Nanhu Lake water system, and it was found that the contribution rate of protein-like peaks to the total fluorescence intensity was 90.80%, and the contribution rate in dry season was higher than that in wet season. The distribution of DOM and its components showed spatial differences, with a trend of high in the north and west and low in the southeast, while the fluorescence index showed temporal trend of being higher in dry season (1.75) than in wet season (1.70). Both humus index and biogenic index showed that the bioavailability of organic matter in Nanhu Lake water system was high, and it was higher in dry season than in wet season. There was a significant positive correlation between DOM, ammonia nitrogen and organic nitrogen. DOM in the water body of Nanhu Lake mainly came from urban domestic source discharge and internal source release, and there existed sewage direct discharge or pipe network leakage in the northwest region. Controlling the exogenous DOM input can effectively control the nitrogen level in the water system.
- Nanhu Lake /
- dissolved organic matter /
- fluorescence components /
- source /
- bioavailability

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