Changes of humic acid in the process of decomposition of Myriophyllum spicatum
BA Cui-cui1,2, ZHANG Yi-min2, YANG Fei2, KONG Ming2, ZHANG Zhi-wei1,2, TANG Zhi-kai1,2, GU Shi-yun1,2
1. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, China; 2. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China
Abstract：Humic acid (HA) of submerged plant Myriophyllum spicatum was studied by parallel factor analysis method, combined with UV absorption spectroscopy, three-dimensional fluorescence spectroscopy and Fourier transform infrared spectroscopy. The change of HA in low, medium and high nutrient sediments revealed the mechanism of the effects of different nutrient sediments on the decomposing of submerged plants. The results showed that the higher was the nutrient level of the sediment, the faster was the decomposing of the foxtail algae (P<0.05), releasing more dissolved organic carbon (DOC), dissolved total nitrogrn (DTN), dissolved total phosphorus (DTP) and humus; The degree of nutrient of the sediment was positively correlated with the hydrophobicity, molecular complexity of and the molecular weight (P<0.05); HA of different nutrient sediments were identified by fluorescence containing one kind of protein component C2 and two kinds of fulvic acid components C1, C3, while fulvic acid-like components and protein-like components had similar component characteristics under different decomposition conditions; HA extracted from different nutrient sediments analyzed by infrared spectra was similar at different times, indicating that HA extracted at different decomposition conditions and times contains similar functional groups, and the extracted HA from the foxtail algae rot high nutrient sediment group contained more aromatic substances and organic phosphorus. The higher was the nutrient level of the sediment, the more beneficial was to the enrichment and sedimentation of phosphorus. The chemical structure of humic acid components in the decomposition of Myriophyllum spicatum by spectral analysis was systematically analyzed. The results can provide a theoretical reference for the ecological management and restoration of lake water environment, and for in-depth understanding of the influence mechanism of different nutrient sediments on the decomposing of submerged plants.
巴翠翠, 张毅敏, 杨飞, 孔明, 张志伟, 汤志凯, 顾诗云. 狐尾藻在不同营养底泥腐解过程中胡敏酸的变化[J]. 中国环境科学, 2019, 39(3): 1226-1236.
BA Cui-cui, ZHANG Yi-min, YANG Fei, KONG Ming, ZHANG Zhi-wei, TANG Zhi-kai, GU Shi-yun. Changes of humic acid in the process of decomposition of Myriophyllum spicatum. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1226-1236.
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