Ultraviolet humic-like component contributes to riverine dissolved organic matter biodegradation
文献类型：期刊论文
| 作者 | Ni, Maofei1,3,4; Li, Siyue2,4
|
| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES
 |
| 出版日期 | 2023-02-01 |
| 卷号 | 124页码:165-175 |
| ISSN号 | 1001-0742 |
| 关键词 | Dissolved organic matter (DOM) Sequential biodegradation Recalcitrant compounds Component and fate Fluorescence analysis |
| DOI | 10.1016/j.jes.2021.10.011 |
| 通讯作者 | Li, Siyue(syli2006@163.com) |
| 英文摘要 | Biological degradation of dissolved organic matter (DOM) regulates its structure and fate in river ecosystems. Previous views suggested that labile components were dominantly consumed by microbial metabolism. Here we provide new observations that a part of recalcitrant compounds largely contribute to riverine DOM biodegradation. The excitation emission matrix fluorescent spectroscopy combined with peak picking and parallel factor analysis are used to explore component variability during DOM incubation. Humic-like and tryptophan-like DOM are the primary components of riverine DOM, with proportion contributions of 39%???82% and 16%???61% for % of the maximum fluorescence intensity, respectively. After 56 days of aerobic incubation in the dark, large amounts of tyrosine-like DOM generation are observed. Elevated temperature enhances the decomposition of ultraviolet humiclike substance and further stimulates labile DOM bio-mineralization into carbon dioxide. Meanwhile, averaged proportions of amino acid compositions (peak B and T) markedly increase ( p < 0.05) as the humic-like compositions (peak A, M and C) decrease after DOM incubation, suggesting incomplete degradation of refractory DOM from high-molecular to low-molecular weight compounds. The findings support the new notion of the continuous DOM biodegradation in a mode as ???steps by steps???, contributing to a new understanding of carbon cycling for the UN Sustainable Development Goal. ?? 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 资助项目 | National Natural Science Foundation of China[31670473] ; National Natural Science Foundation of China[42107091] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000797162500009 |
| 源URL | [http://119.78.100.138/handle/2HOD01W0/16209]  |
| 专题 | 中国科学院重庆绿色智能技术研究院 |
| 通讯作者 | Li, Siyue |
| 作者单位 | 1.Guizhou Minzu Univ, Coll Ecoenvironm Engn, Guiyang 550025, Peoples R China 2.Wuhan Inst Technol, Res Ctr Environm Ecol & Engn, Sch Environm Ecol & Biol Engn, Wuhan 430205, Peoples R China 3.Guizhou Minzu Univ, Karst Environm Geol Hazard Prevent Lab, Guiyang 550025, Peoples R China 4.Chinese Acad Sci, Res Ctr Ecohydrol, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ni, Maofei,Li, Siyue. Ultraviolet humic-like component contributes to riverine dissolved organic matter biodegradation[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2023,124:165-175. |
| APA | Ni, Maofei,&Li, Siyue.(2023).Ultraviolet humic-like component contributes to riverine dissolved organic matter biodegradation.JOURNAL OF ENVIRONMENTAL SCIENCES,124,165-175. |
| MLA | Ni, Maofei,et al."Ultraviolet humic-like component contributes to riverine dissolved organic matter biodegradation".JOURNAL OF ENVIRONMENTAL SCIENCES 124(2023):165-175. |
入库方式： OAI收割
来源：重庆绿色智能技术研究院
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