南京市中、富营养化城市湖泊溶解性有机质的组成特征及来源分析

王华梓; 胡思文; 左腾腾; 童幸子; 张玄麒; 周一豪; 赵大勇

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (5) : 2520-2529.

水污染与控制

南京市中、富营养化城市湖泊溶解性有机质的组成特征及来源分析

王华梓, 胡思文, 左腾腾, 童幸子, 张玄麒, 周一豪, 赵大勇

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Composition characteristics and source identification of dissolved organic matter in medium and eutrophic urban lakes in Nanjing

WANG Hua-zi, HU Si-wen, ZUO Teng-teng, TONG Xing-zi, ZHANG Xuan-qi, ZHOU Yi-hao, ZHAO Da-yong

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摘要

以江苏省南京市境内多个城市湖泊为野外调查对象,收集了78份来自中营养和富营养化城市湖泊的水体样品,采用三维荧光光谱结合平行因子分析法解析了水体中DOM的组成、来源,并探究其与水体理化因子间的相互关系,以期揭示水体富营养化对DOM荧光特征的影响及作用途径.结果表明,所调查湖泊中共存在3种DOM荧光组分,包括人为活动产生的类腐殖质物质C1组分,陆源输入的类腐殖质物质C2组分,以及湖泊水体微生物代谢释放的类蛋白物质C3组分,其中在富营养化水体中类腐殖质C2组分和以色氨酸成分为主的C3组分的荧光强度平均高于中营养水体.荧光特征参数的分析结果表明,水体中的DOM兼具陆源和自生源,中营养水体中DOM的腐殖化程度高于富营养化水体,但所测湖泊水样中DOM的腐质化指数普遍低于1.0,并且DOM自生源指数随着水体营养指数的升高呈现增加趋势.此外,富营养化湖泊水体中的叶绿素a含量显著高于中营养湖泊,水体中叶绿素a含量与C2、C3组分的荧光强度以及DOM的自生源指数均呈现显著正相关,表明富营养化水体可能通过刺激藻类的大量繁殖,从而进一步导致内源DOM的释放.

Abstract

A total of 78 water samples from mesotrophic and eutrophic urban lakes in Nanjing, Jiangsu Province, China were systematically analysed using three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy coupled with parallel factor analysis (PARAFAC) to characterize dissolved organic matter (DOM) composition and sources as well as their links with water physiochemistry parameters. This study was designed to unravel the effects of eutrophication on the fluorescence characteristics of DOM and its influence pathway. Three distinct fluorescent components were identified: anthropogenic-derived humic-like substances (C1), terrestrial humic-like substances (C2), and microbial-produced protein-like substances (C3). Eutrophic urban lakes exhibited significantly higher fluorescence intensities in both C2 and C3 relative to mesotrophic urban lakes. Fluorescence indices confirmed dual DOM sources-terrestrial inputs and autochthonous production. Meanwhile, although the humification index of DOM in mesotrophic urban lakes exceeded that in eutrophic urban lakes, the humification index of DOM was below 1.0 for all samples. Moreover, the biological index of DOM exhibited an increasing trend with the elevation of trophic status of water column. Additionally, significantly elevated Chla concentration were observed in eutrophic lakes compared to mesotrophic lakes. Strong positive correlations were identified between Chla concentration and the fluorescence intensity of C2 and C3 components alongside the biological index of DOM, suggesting that eutrophication may induced autochthonous DOM by stimulating algae reproduction.

导出引用

王华梓, 胡思文, 左腾腾, 童幸子, 张玄麒, 周一豪, 赵大勇. 南京市中、富营养化城市湖泊溶解性有机质的组成特征及来源分析[J]. 中国环境科学. 2025, 45(5): 2520-2529

WANG Hua-zi, HU Si-wen, ZUO Teng-teng, TONG Xing-zi, ZHANG Xuan-qi, ZHOU Yi-hao, ZHAO Da-yong. Composition characteristics and source identification of dissolved organic matter in medium and eutrophic urban lakes in Nanjing[J]. China Environmental Science. 2025, 45(5): 2520-2529

中图分类号： X753 P641

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