| 鄱阳湖沉积物溶解性有机质光谱特征 |
| 摘要点击 2321 全文点击 734 投稿时间：2021-06-05 修订日期：2021-07-17 |
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| 中文关键词 沉积物 溶解性有机质(DOM) 紫外-可见吸收光谱 三维荧光光谱 鄱阳湖 |
| 英文关键词 sediments dissolved organic matter (DOM) UV-vis spectra 3D-EEMs Poyang Lake |
| 作者 | 单位 | E-mail | | 罗燕清 | 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | Lyqluoyanqing@163.com | | 万智巍 | 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | | | 晏彩霞 | 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | yancaixia@jxnu.edu.cn | | 聂明华 | 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | | | 丁明军 | 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | | | 鞠民 | 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | | | 刘赟 | 江西师范大学地理与环境学院, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022 | |
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| 中文摘要 |
| 目前针对鄱阳湖流域沉积物溶解性有机质（DOM）光谱特征的研究仍较少，因此基于紫外-可见光谱和三维荧光光谱技术，并结合平行因子分析法（PARAFAC），对鄱阳湖沉积物中DOM的物质组成和来源特征进行了解析.结果表明，鄱阳湖沉积物DOM的腐殖化程度较高，是陆源输入和藻类、浮游生物等内源产生的混合型，且以陆源输入为主.与碟形湖区相比，通江水域沉积物DOM的有色溶解性有机质浓度更高、DOM粒径更大且芳香性及腐殖化程度更高.通过PARAFAC共解析出3个类腐殖质组分（C1、C2、C4）和1个类蛋白组分（C3）.与碟形湖相比，腐殖质组分均表现为通江水域更高，其中C1组分在两区域的占比均为所有组分中最高，前者为42%，后者为46%.空间分布上，4个组分荧光强度总体上呈现东高西低的趋势，高值主要分布在都昌和南矶湿地水域附近，分析主要与丰水期水位上涨、大量植物被淹死亡和人类活动有关.主成分分析结果表明，湖区不同沉积物DOM荧光组分差异较小，但以碟形湖区沉积物DOM腐殖化程度略高. |
| 英文摘要 |
| At present, there are few studies on the spectral characteristics of dissolved organic matter (DOM) in the sediments of the Poyang Lake basin. Therefore, excitation-emission matrix spectroscopy (EEMs) technology and ultraviolet-visible spectra combined with the parallel factor analysis (PARAFAC) were applied to investigate the fluorescent components and sources of DOM in sediments from Poyang Lake. The results showed that the DOM in sediments originated from both terrestrial and autochthonous sources with a high humification. Compared with the sub-lakes, the DOM from the main lake was characterized with a higher concentration of colored DOM, larger particle size, and higher aromaticity and humification degree. In addition, four fluorescence components of DOM in sediments were identified by the PARAFAC model, including three humic-like components (C1, C2, and C4) and one protein-like component (C3). The fluorescence intensity of the humic substances in the sub-lakes was higher than those in the main lake. Furthermore, the percentage of fluorescence abundance of C1 was the highest both in the sub-lakes (42%) and main lake (46%). The spatial distribution of the fluorescence intensity of the four components gradually increased from west to east, and the peak values were observed in the Duchang and Nanji Wetland. This may be related to the death of a large number of plants due to the rise in the water level during the wet season and human activities. Principal component analysis showed that although there were no significant differences in the four fluorescent components between the sub-lakes and the main lake, the humification degree of DOM in the sub-lakes was slightly higher than that in the main lake. |
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