Dynamic Changes of Dissolved Organic Matter Derived from Algal Decomposition and the Environmental Effects in Eutrophic Lakes

被引：2
|
作者：
Zhang J. [1 ]
Chen M.-Y. [2 ]
Hao Z.-N. [3 ,4 ]
Zhong H. [1 ]
He H. [2 ]
Lei P. [1 ,2 ,5 ]
机构：
[1] State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing
[2] School of Environment, Nanjing Normal University, Nanjing
[3] State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing
[4] University of Chinese Academy of Sciences, Beijing
[5] State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing
来源：
Huanjing Kexue/Environmental Science | 2024年 / 45卷 / 03期
关键词：
algal decomposition; bioavailability; dissolved organic matter; greenhouse gas; relative molecular weight;
D O I：
10.13227/j.hjkx.202305135
中图分类号：
学科分类号：
摘要：
The global occurrences of lake eutrophication have led to algal bloom and the subsequent algal decomposition，releasing high amounts of algae-derived dissolved organic matter（DOM）into the lake water. Algae-derived DOM could regulate the quantity and composition of DOM in lake water and further impact the biogeochemical cycles of multiple elements. In this study，the dynamic changes in the quantity and quality of DOM during algal decomposition under different eutrophic scenarios（e. g.，from oligotrophication to severe eutrophication）were monitored，and the corresponding environmental effects（e. g.，microbial responses and greenhouse gas emissions）caused by algal decomposition were further explored. The results showed that algal decomposition significantly increased the DOM levels，bioavailability，and intensities of fluorescent components in the water. The total DOM levels gradually decreased，whereas the average molecular weight increased along the decomposition process. Furthermore，unsaturated hydrocarbon and aliphatic compounds were preferentially utilized by microorganisms during algal decomposition，and some refractory molecules（e. g.，lignin，condensed hydrocarbons，and tannin with high O/C values）were synchronously generated，as evidenced by the results from ultra-high-resolution mass spectrometry. The dominant bacterial species during algal decomposition shifted from Proteobacteria（46%）to Bacteroidetes（42%）. In addition，algae addition resulted in 1. 2-5 times the emissions of CO2 and CH4 from water，and the emission rates could be well predicted by the optical index of a254 in water. This study provides comprehensive perspectives for understanding the environmental behaviors of aquatic DOM and further paves the ways for the mitigation of lake eutrophication. © 2024 Science Press. All rights reserved.
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页码：1539 / 1552
页数：13
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