| 城镇流域水体-沉积物中溶解性有机质的荧光特性及影响因素:以宁波市小浃江为例 |
| 摘要点击 2297 全文点击 946 投稿时间：2019-02-27 修订日期：2019-04-11 |
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| 中文关键词 小浃江 水体 沉积物 溶解性有机质(DOM) 三维荧光光谱 平行因子分析法(PARAFAC) |
| 英文关键词 Xiaojia River water sediment dissolved organic matter(DOM) three-dimensional fluorescence spectra parallel factor analysis(PARAFAC) |
| 作者 | 单位 | E-mail | | 高凤 | 安徽师范大学生命科学学院, 安徽省高校生物环境与生态安全省级重点实验室, 芜湖 241000
中国科学院城市环境研究所城市环境与健康重点实验室, 厦门 361021
中国科学院宁波城市环境观测研究站, 宁波 315830 | gao_feng1886@163.com | | 邵美玲 | 安徽师范大学生命科学学院, 安徽省高校生物环境与生态安全省级重点实验室, 芜湖 241000 | | | 唐剑锋 | 中国科学院城市环境研究所城市环境与健康重点实验室, 厦门 361021
中国科学院宁波城市环境观测研究站, 宁波 315830
中国科学院生态环境研究中心城市与区域生态国家重点实验室, 北京 100085 | jftang@iue.ac.cn | | 曹昌丽 | 中国科学院城市环境研究所城市环境与健康重点实验室, 厦门 361021
中国科学院宁波城市环境观测研究站, 宁波 315830 | | | 易辉 | 中国科学院城市环境研究所城市环境与健康重点实验室, 厦门 361021
中国科学院宁波城市环境观测研究站, 宁波 315830 | |
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| 中文摘要 |
| 我国快速城镇化过程对流域水体和沉积物的溶解性有机质（dissolved organic matter，DOM）含量和成分产生了重要影响，探究水体-沉积物中DOM的分布特性及影响因素具有重要意义.本研究选取长三角典型城镇地区宁波市北仑区小浃江流域为研究对象，利用三维荧光光谱技术，结合PARAFAC（平行因子分析）模型及相关性分析，对小浃江流域水体及沉积物DOM光谱特性进行研究，分析DOM荧光组分特征及来源.结果表明：①小浃江水体-沉积物DOM主要包括4种组分：C1、C2、C3和C4，其中C1为陆源类腐殖质，分子量较大；C2为陆源类腐殖质，由生物降解产生，分子量较小；C3为类蛋白物质，包括类色氨酸，对微环境的变化敏感；C4为陆源类腐殖质.②小浃江水体DOM受新生内源和陆源输入共同影响，腐殖化程度较弱，腐殖质含量较低.沉积物以陆源或土壤源输入为主，内源贡献较小，DOM具有一定的腐殖化特征，腐殖质的浓度水平高于水体中腐殖质含量.③冗余分析（redundancy analysis，RDA）表明，水体DOM各组分相关性较高的环境因子主要为农田、城镇；而沉积物DOM各组分相关性较高的环境因子为城镇、农田、湿地.其中，城镇对沉积物中类腐殖质C4和类腐殖质的浓度参数Fn（355）影响最大. |
| 英文摘要 |
| Rapid urbanization has a significant impact on dissolved organic matter (DOM) in water and sediment; thus, it is important to explore the distribution characteristics and influencing factors of DOM in watersheds. Xiaojia River is a typical urban area in Beilun District of Ningbo City, Yangtze River Delta. The spectral characteristics of DOM in the water and sediment in this river were studied to examine their sources and characteristics. The DOM was analyzed by three-dimensional fluorescence spectroscopy (EEM) coupled with the parallel factor analysis (PARAFAC) model. The following results were noted. ① Four fluorescence DOM components were derived by EEM-PARAFAC:C1 represents terrestrial humus with a high molecular weight; C2 represents terrestrial humus with a low molecular weight, which was produced by biodegradation; C3 represents protein-like substances that were sensitive in a microenvironment; and C4 is terrestrial humus. ② Both new-born endogenous and terrestrial sources have large impacts on DOM components. The humification degree was very weak with a low concentration of humus. The DOM in the sediments was derived mainly from terrestrial or soil sources with small endogenous contribution with high humification. The concentration of humus in the sediments was significantly higher than that in water. ③ Redundancy analysis (RDA) showed that farmland and urban land use were the dominant environmental factors and had relatively high correlation with the water indicators. Construction land, farmland, and wetland land use positively correlated with the sediment components. Among them, urban land use had the greatest influence on the concentration parameter Fn(355) of humus-like substance C4 and the humus-like substance in sediments. |
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