| 区域土地利用类型对水源水中溶解性有机物丰度和荧光组分的影响 |
| 摘要点击 2936 全文点击 1197 投稿时间：2021-05-05 修订日期：2021-09-18 |
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| 中文关键词 潮白河 溶解性有机物(DOM) 三维荧光光谱(EEMs) 荧光指数 平行因子分析(PARAFAC) |
| 英文关键词 Chaobai River dissolved organic matter (DOM) excitation emission matrix spectroscopy (EEMs) fluorescence index parallel factor analysis (PARAFAC) |
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| 中文摘要 |
| 以潮白河密云段水体为研究对象，采用三维荧光光谱法及平行因子分析解析了潮白河饮用水源中溶解性有机物（DOM）来源和荧光特性，结合方差分析探讨了不同季节和区域土地利用类型对DOM浓度和荧光组分强度的影响.结果表明，潮白河密云段水体荧光溶解性有机物（FDOM）由5种荧光组分组成，包括微生物腐殖质2种，自生酪氨酸，还原醌类和陆地腐殖质类各1种.DOM主要来源于微生物.河岸周边土地利用以农田为主的区域水体中DOM浓度相比森林和城镇较大，河岸周边土地利用以农田和城镇为主的区域水体FDOM各荧光组分强度均低于森林.潮白河密云段水体DOM受其附近农田土地利用影响程度比森林和城镇土地利用影响更大，由于沿岸土地利用类型变化河流中增加的DOM主要是非荧光部分.虽然季节对DOM腐殖化程度也有显著影响，但土地利用与季节对水体DOM的影响不存在交互效应. |
| 英文摘要 |
| Regional concentrations, fluorescent components, and sources of dissolved organic matter (DOM) in a drinking water source in Chaobai River across seasons were investigated here using fluorescence excitation-emission matrices, parallel factor analysis, and fluorescence indexes. Five fluorescent-DOM components were identified, including two microbial humic-like components and one autochthonous tyrosine-like, one reduced quinone-like, and one terrestrial humic-like component. DOM was mainly derived from microorganisms. The farmland-dominated region showed the highest DOM concentration and significantly lower maximum fluorescence intensities (Fmax) of almost all fluorescent components than those in the forest-dominated region. The region dominated by urban lands exhibited obviously lower DOM concentrations than those in the farmland-dominated region and lower Fmax values of fluorescent components than those in the forest-dominated region. No interaction was found between land use and season when considering their effects on DOM. Season had a significant influence on the humification degree of DOM. This study shows that agricultural land use had a greater impact on DOM than that of forests and urban areas, and the increased riverine DOM resulting from farmland was mainly non-fluorescent parts. |
