He Jie, Zhu Xue-Hui, Wei Bin, Li Xue-Yan, Tang Ru-Tao, Lin Xin, Zhou Fei, Shi Zhuang-Zhuang
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
Environment Biotechnology Research Institute, Suzhou University of Science and Technology, Suzhou 215009, China.
Huan Jing Ke Xue. 2021 Apr 8;42(4):1889-1900. doi: 10.13227/j.hjkx.202009087.
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 (<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, SUVA, SUVA, 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 (<0.01) with the characteristic parameters (FI, HIX, BIX, and :α). All the fluorescence components had a high correlation (<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.
基于激发发射矩阵光谱（EEMs）技术结合平行因子分析（PARAFAC）和紫外可见光谱，对苏州某景观河在汛期不同时段溶解有机物（DOM）的光谱特征和来源进行了分析。利用PARAFAC模型识别出四种荧光组分，包括两种类腐殖质组分（C1、C4）和两种类蛋白质组分（C2、C3），其中C2与C3/C4以及C3与C4之间的相关系数均达到显著水平（<0.01）。在汛期初期，由于初期雨水的影响，河流中DOM的总荧光强度相对较高，但在汛期中期和后期显著降低。荧光特征参数表明，在汛期初期DOM的自源贡献较大。相反，在洪水期中期，来自陆地源的DOM含量增加。在整个汛期，SUVA、SUVA和E2/E3呈现相同的趋势，即先降低后升高。由于汛期持续暴雨，河道中氮磷养分含量增加。由于整个汛期水动力条件较强，藻类种群未大量增殖。荧光组分C2、C3和C4与特征参数（FI、HIX、BIX和α）呈现显著相关系数（<0.01）。所有荧光组分与DOC均具有高度相关性（<0.05）。荧光组分C1与Chla之间存在显著相关性。主成分分析表明，景观河在汛期不同时段的DOM组分存在显著差异，汛期持续暴雨对水体中C2、C3和C4组分的含量有较大影响。
