| 不同类型湖泊DOM光谱特征及来源的季节性变化 |
| 摘要点击 687 全文点击 87 投稿时间：2024-01-29 修订日期：2024-05-25 |
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| 中文关键词 溶解性有机质（DOM） 季节变化 光谱特征 紫外-可见吸收光谱 三维荧光光谱 |
| 英文关键词 dissolved organic matter （DOM） seasonal variation spectral characteristics UV-vis spectrum 3D fluorescence spectroscopy |
| 作者 | 单位 | E-mail | | 高静湉 | 内蒙古科技大学能源与环境学院, 包头 014010
黄河流域内蒙古段生态保护与综合利用自治区协同创新中心, 包头 014010 | nkdgjtsmile@163.com | | 汤世科 | 内蒙古科技大学能源与环境学院, 包头 014010
黄河流域内蒙古段生态保护与综合利用自治区协同创新中心, 包头 014010 | | | 刘文理 | 内蒙古科技大学能源与环境学院, 包头 014010
黄河流域内蒙古段生态保护与综合利用自治区协同创新中心, 包头 014010 | | | 于凤萍 | 内蒙古科技大学能源与环境学院, 包头 014010
黄河流域内蒙古段生态保护与综合利用自治区协同创新中心, 包头 014010 | | | 张鹏 | 内蒙古科技大学能源与环境学院, 包头 014010
黄河流域内蒙古段生态保护与综合利用自治区协同创新中心, 包头 014010 | | | 李卫平 | 内蒙古科技大学能源与环境学院, 包头 014010
黄河流域内蒙古段生态保护与综合利用自治区协同创新中心, 包头 014010 | sjlwp@163.com |
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| 中文摘要 |
| 为研究不同类型湖泊溶解性有机质（DOM）的时空分布特征及来源,于2023年4月和7月采集内蒙古乌梁素海、岱海和南海湖水样,通过紫外可见吸收光谱、三维荧光光谱结合平行因子分析法对3个湖泊DOM的光谱特征、物质组成进行分析,并探究DOM对水质因子的响应. 结果表明,3个湖泊中岱海DOM的含量最高. 相比春季,乌梁素海、岱海和南海湖夏季DOC平均质量浓度分别升高了69.57%、14.68%和85.88%. 在空间分布上,乌梁素海DOM从春季的北部高到夏季的中部高, ρ（DOC）最高值从15.32 mg·L-1升至25.73 mg·L-1. 岱海DOM在春季湖中心区域最高[ρ（DOC）为56.12 mg·L-1],夏季西部区域最高[ρ（DOC）为64.12 mg·L-1] . 南海湖春季入水口区域DOM较高,夏季出水口区域升高1倍. 在特性方面,乌梁素海DOM的芳香性与疏水性最高,南海湖最低；3个湖泊的腐殖质均以富里酸为主. 在来源上,春季乌梁素海DOM以内源为主,夏季以外源为主；岱海和南海湖整体以内源为主,从春季到夏季,岱海外源特征增强,南海湖内源特征增强. 3个湖泊DOM均与TN、TP和DO有显著相关性,乌梁素海中TN、TP和Chl-a及岱海中TN、TP和COD的增加均削弱了其DOM的内源性；南海湖TN、Chl-a、DO和COD的增加增强了DOM的内源性. 不同类型湖泊DOM空间分布及来源季节变化明显,为水文条件、外界水源输入、生物活动及人类影响综合作用所致. |
| 英文摘要 |
| To study the spatio-temporal distribution characteristics and sources of dissolved organic matter （DOM） in different types of lakes, water samples were collected from the Wuliangsuhai Lake, Daihai Lake, and Nanhai Lake in Inner Mongolia in April and July 2023. The spectral characteristics and composition of DOM in the three lakes were analyzed using UV-vis spectroscopy, 3D fluorescence spectroscopy, and parallel factor analysis. Additionally, the response of DOM to water quality factors was explored. The results showed that the Daihai Lake had the highest DOM content among the three lakes. Compared to that during spring, the average concentration of dissolved organic carbon （DOC） during summer in the Wuliangsuhai Lake, Daihai Lake, and Nanhai Lake increased by 69.57%, 14.68%, and 85.88%, respectively. Additionally, the highest concentration of DOC in the Wuliangsuhai Lake increased from 15.32 mg·L-1 in the northern region during spring to 25.73 mg·L-1 in the central region during summer. The highest DOM concentration in the Daihai Lake was in the central region during spring with 56.12 mg·L-1 DOC but in the western region during summer with 64.12 mg·L-1 DOC. In the Nanhai Lake, the DOM in the inlet area was higher during spring, whereas it doubled in the outlet area during summer. Moreover, DOM in the Wuliangsuhai Lake showed the highest aromaticity and hydrophobicity, but lowest values were found in the Nanhai Lake. In addition, the humus of the three lakes mainly comprised fulvic acid. As for source, DOM was mainly endogenous during spring and exogenous during summer in the Wuliangsuhai Lake, while it was endogenous in the Daihai Lake and Nanhai Lake. Furthermore, the exogenous characteristics of DOM in the Daihai Lake were enhanced, while the endogenous characteristics of DOM in the Nanhai Lake were enhanced from spring to summer. Significant correlations were observed between DOM and TN, TP, and DO in the three lakes. The increase in TN, TP, and Chl-a in the Wuliangsuhai Lake and TN, TP, and COD in the Daihai Lake weakened the endogenous characteristics of DOM, whereas the increase in TN, Chl-a, DO, and COD in the Nanhai Lake enhanced the endogenous characteristics of DOM. The seasonal variation of spatial distribution and sources of DOM in different types of lakes were markedly influenced by hydrological conditions, external water input, biological activities, and human impacts. |
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