| 城镇化河流溶解性有机质的荧光特性与水质相关性:以宁波市北仑区芦江为例 |
| 摘要点击 4098 全文点击 1372 投稿时间：2017-07-18 修订日期：2017-09-28 |
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| 中文关键词 溶解性有机质 三维荧光 荧光区域积分法 水质 城镇化河流 |
| 英文关键词 dissolved organic matter excitation-emission matrix fluorescence fluorescence regional integration(FRI) water quality urban river |
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| 中文摘要 |
| 以宁波市北仑区芦江为例，利用三维荧光技术分析城镇化河流水体荧光溶解性有机物（FDOM）组成结构及其空间分布特征，研究FDOM与河流水质的相关性.结果表明，FDOM由类酪氨酸、类色氨酸、类溶解性微生物副产品、类富里酸物质组成，以类蛋白组分为主要成分，占总荧光强度的比例高达83.8%，而类腐殖物质的含量较少.各组分荧光强度与氮、磷、金属含量呈显著正相关，表明FDOM与氮、磷等元素的迁移转化有关；FDOM呈现明显的空间分布格局，上游水体FDOM含量较低受人类活动影响较小，下游FDOM含量较高呈现城镇河段排放分布特征；表明人类活动对河流水质及FDOM含量和组成均产生重要影响. |
| 英文摘要 |
| Excitation-emission matrix fluorescence spectroscopy combined with fluorescence regional integration (FRI) analysis were adopted to analyze the water samples collected from the Lujiang River, which flows through the rapidly urbanizing areas of Beilun, Ningbo, in order to illuminate the composition and characteristics of the spatial distribution of fluorescent dissolved organic matter (FDOM), and further to explain its correlation with water quality in the urban river. The results showed that FDOM was composed of tyrosine-like, tryptophan-like, soluble microbial by-product-like, fulvic-like, and humic-like materials, and FDOM was dominated by protein-like components, accounting for 83.8% of the total fluorescence intensity, while humic-like components accounted for much less. The concentrations of the water quality parameters, such as total nitrogen, total phosphorus, and metals, were linearly correlated with the total fluorescence intensity of all components, indicating that FDOM was significantly related to the removal and transformation of nitrogen and phosphorus. The distribution of FDOM in different areas has the following characteristics:FDOM was low and not distinctly influenced by human activities in the upstream, while in the downstream, FDOM was high and showed the characteristics typical of that in urbanized rivers. Therefore, anthropogenic activities can greatly influence river water quality and the concentration and composition of FDOM. |
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