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选取白洋淀淀区的泥、水以及晒干的优势沉水植物金鱼藻、轮藻为研究对象,设置6个密度梯度模拟实验,分别于实验进行的50 d和100 d采集水样,运用紫外和荧光光谱技术研究沉水植物腐解阶段水体中溶解性有机质(DOM)的变化。结果显示,同步荧光光谱中,类蛋白峰荧光强度的变化不具规律性,类腐殖质峰荧光强度随密度的增加呈上升趋势,I2/I1的值随着密度的增加或时间的推移均逐渐增大;三维荧光光谱中,随着密度的增加,类富里酸荧光峰A和C的强度逐渐增加,而类色氨酸荧光峰T1的强度变化不大,腐解植物的密度大于3 kg/m3时各组均产生了类海洋腐殖质荧光峰B且强度随密度的增加逐渐增强,C峰的强度与水样中的COD和TP呈显著正相关;紫外光谱测定中,A253/A203的值随着密度的增加或时间的推移而逐渐增大,水体中的芳香族化合物也增多。
Six mud density gradients were selected from the mud and water of the Baiyangdian lake area and the sunfish (Ctenopharyngodon idellus), the dominant submerged macrophyte (Cnidium spp.) In the Baiyangdian lake. Six water density gradients were collected at the experiment days 50 and 100, respectively. Fluorescence Spectroscopy Study on Changes of Dissolved Organic Matter (DOM) in Submerged Plants during Decomposition Stage. The results showed that the change of fluorescence intensity of the protein-like peaks was not regular in the synchronous fluorescence spectrum, and the fluorescence intensity of the humus-like peaks increased with the increase of the density. The value of I2 / I1 gradually increased with the increase of density or time In the three-dimensional fluorescence spectrum, the intensities of the fluorescence peaks A and C of the class of fulvic acid gradually increase with the increase of the density, while the intensity of the type 1 tryptophan fluorescence peak does not change much. When the density of the decomposed plant is more than 3 kg / m3 In each group, the fluorescence peak B of marine humus was produced and the intensity increased gradually with the increase of density. The intensity of C peak was positively correlated with the COD and TP in water sample. The value of A253 / A203 in the UV spectrum was as the density Of the increase or the passage of time gradually increases, the amount of aromatics in the water body also increases.