中文关键词溶解性有机物(DOM)汛期三维荧光光谱(EEMs)平行因子分析紫外-可见光谱 英文关键词dissolved organic matter(DOM)flood seasonexcitation emission matrix spectroscopy(EEMs)parallel factor analysisUV-vis spectrum

作者	单位	E-mail
何杰	苏州科技大学环境科学与工程学院, 苏州 215009 苏州科技大学环境生物技术研究所, 苏州 215009	hj1216756742@163.com
朱学惠	江苏省优联检测技术服务有限公司, 苏州 215300
魏彬	苏州市宏宇环境科技股份有限公司, 苏州 215011
李学艳	苏州科技大学环境科学与工程学院, 苏州 215009 苏州科技大学环境生物技术研究所, 苏州 215009	lxyhit@sina.com
汤如涛	苏州科技大学环境科学与工程学院, 苏州 215009 苏州科技大学环境生物技术研究所, 苏州 215009
林欣	苏州科技大学环境科学与工程学院, 苏州 215009 苏州科技大学环境生物技术研究所, 苏州 215009
周飞	苏州科技大学环境科学与工程学院, 苏州 215009 苏州科技大学环境生物技术研究所, 苏州 215009
司壮壮	苏州科技大学环境科学与工程学院, 苏州 215009 苏州科技大学环境生物技术研究所, 苏州 215009

中文摘要 为探究汛期连续强降雨对苏州景观河道中溶解性有机物的影响，应用三维荧光光谱（EEMs）结合平行因子分析（PARAFAC）和紫外-可见吸收光谱（UV-vis）技术，分析了汛期不同时期苏州景观河道中溶解性有机物的光谱特性和来源.结果表明，整个汛期时期水体中共有4种溶解性有机物（DOM）荧光组分，包括2种类腐殖质组分（C1和C4）和2种类蛋白质组分（C2和C3），相关性分析表明荧光组分C2、C3和C4之间存在显著相关性.汛期初期时受初期雨水影响，河道中DOM的总荧光强度较强，而在汛期中期和后期，DOM的荧光强度显著降低.荧光特征参数表明，在汛期初期时DOM的内源性特征显著，到中期时陆源性显著，到后期又以内源占主导.整个汛期SUVA₂₅₄、SUVA₂₆₀和E2/E3都呈现相同趋势，先降低而后升高.受汛期连续强降雨的影响，河道中氮磷营养盐含量增加，但在汛期较强的水动力条件下，藻类并未大量增殖，直到汛期结束后藻类开始大量增殖.荧光组分C2、C3和C4与特征参数（FI、HIX、BIX和β：α）有显著相关性（P<0.01），所有荧光组分与DOC均有显著相关性（P<0.05），荧光组分C1与叶绿素a （Chla）有显著相关性.主成分（PCA）分析表明汛期不同时期河道中DOM组分差异显著，汛期连续强降雨对水体中C2、C3和C4组分含量影响显著. 英文摘要 Based on excitation emission matrix spectroscopy (EEMs) technology combined with the parallel factor analysis (PARAFAC) and UV-vis spectra, the spectral characteristics and sources of dissolved organic matter (DOM) from a landscape river were analyzed during different periods of the flood season in Suzou. Four fluorescent components were identified using the PARAFAC model, including two humus-like components (C1, C4) and two protein-like components (C2, C3), with a significant correlation coefficient (P<0.01) in C2 and C3/C4 and C3 and C4, respectively. During the early flood season, the total fluorescence intensity of the DOM in the river was relatively higher due to the influence of initial rainwater but reduced significantly towards the middle and late flood season. The fluorescence characteristic parameters indicated that the autochthonous contribution of DOM were substantial during the early stages of the flood season. On the contrary, there were increased levels of DOM largely from terrestrial origins during the middle flooding period. During the entire flood season, SUVA₂₅₄, SUVA₂₆₀, and E2/E3 exhibited the same trend, that is, decreasing first and then increasing. As a result of the continuous heavy rainfall during the flood season, the nitrogen and phosphorus nutrient content in the channel increased. The algae population did not proliferate in large quantities because of the strong hydrodynamic conditions experienced throughout the flood season. The fluorescence components C2, C3, and C4 exhibited a significant correlation coefficient (P<0.01) with the characteristic parameters (FI, HIX, BIX, and β:α). All the fluorescence components had a high correlation (P<0.05) with DOC. There was a considerable correlation between fluorescence component C1 and Chla. The principal component analysis revealed that the DOM components in the landscape river during different periods of the flood season exhibited notable differences, and the continuous heavy rainfall during the flood season has a substantial influence on the content of C2, C3, and C4 components in the water body.

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