Hydrological seasonality and nutrient stoichiometry control dissolved organic matter characterization in a headwater stream
文献类型：期刊论文
| 作者 | Li, Siyue2,3 ; Luo, Jiachen4; Xu, Y. Jun5,6; Zhang, Liuqing4; Ye, Chen1,7
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| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
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| 出版日期 | 2022-02-10 |
| 卷号 | 807页码:10 |
| 关键词 | Dissolved organic carbon Allochthonous and autochthonous DOM Headwater carbon flux Excitation emission matrix fluorescence Anthropogenic inputs Stoichiometric ratios |
| ISSN号 | 0048-9697 |
| DOI | 10.1016/j.scitotenv.2021.150843 |
| 通讯作者 | Li, Siyue(syli2006@163.com) |
| 英文摘要 | Dissolved organic matter (DOM) is a diverse and highly complex mixture of organic macromolecules, and thus plays a central role in aquatic ecosystems. However, responses of components and sources of DOM to hydrological processes and trophic levels (nutrient stoichiometric ratios) are poorly understood, particularly in monsoonal headwater streams of Asia that are vulnerable to catchment physical characteristics. In this study, the excitation -emission matrix florescence spectroscopy coupled with parallel factor analysis (EEM-PARAFAC) was used to explore the DOM characters in a headwater stream, where seasonal rainfalls and nutrient levels vary largely. The EEM-PARAFAC modelling identified one autochthonous protein-like fluorescence substance (C1) and two allochthonous fulvic-and humic-like fluorescence compounds (C2 and C3). The allochthonous compounds dominated the overall DOM signal in the headwaters. The hydrological seasonality coupled with nutrients was key in modulating headwater DOM sources and components. Seasonal rainfall events contributed more allochthonous terrestrial-derived DOM flushing into river waters, resulting in higher fulvic-and humiclike organic matter (C2 + C3) in the wet season. In the dry season, longer water residence time accompanying with higher C:P stoichiometric ratio was responsible for higher autochthonous microbial-and plant-derived DOM (tryptophan , tyrosine fractions), also reflected by higher C1, biological index (BIX) and freshness index (beta:alpha). In-stream microbial metabolism of labile DOM fractions largely contributed to autochthonous DOM and partial pressure CO2 increase in the headwater stream. Our findings indicate that quality and quantity of DOM in headwater streams play a crucial role in downstream carbon cycle. Furthermore, the evidence combined from PARAFAC components, pCO(2) and spectral slope clearly highlights the importance of microbial metabolism of carbon in lotic systems, especially during a dry season with increased residence time. (C) 2021 Elsevier B.V. All rights reserved. |
| 资助项目 | National Natural Science Foundation of China (NSFC)[31670473] ; Youth Innovation Promotion Association of the Chinese Academy of Science[2019334] ; U.S. Department of Agriculture Hatch Fund[LAB94459] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:000709735100005 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.138/handle/2HOD01W0/14386]  |
| 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.Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan 430074, Peoples R China 2.Wuhan Inst Technol, Sch Environm Ecol & Biol Engn, Res Ctr Environm Ecol & Engn, Wuhan 430205, Peoples R China 3.Wuhan Inst Technol, Key Lab Green Chem Proc, Key Lab Novel Reactor & Green Chem Technol Hubei, Minist Educ, Wuhan 430205, Peoples R China 4.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Key Lab Reservoir Aquat Environm, Chongqing 400714, Peoples R China 5.Louisiana State Univ, Sch Renewable Nat Resources, Agr Ctr, Baton Rouge, LA 70803 USA 6.Louisiana State Univ, Coastal Studies Inst, Baton Rouge, LA 70803 USA 7.Chinese Acad Sci, Ctr Plant Ecol, Core Bot Gardens, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Siyue,Luo, Jiachen,Xu, Y. Jun,et al. Hydrological seasonality and nutrient stoichiometry control dissolved organic matter characterization in a headwater stream[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2022,807:10. |
| APA | Li, Siyue,Luo, Jiachen,Xu, Y. Jun,Zhang, Liuqing,&Ye, Chen.(2022).Hydrological seasonality and nutrient stoichiometry control dissolved organic matter characterization in a headwater stream.SCIENCE OF THE TOTAL ENVIRONMENT,807,10. |
| MLA | Li, Siyue,et al."Hydrological seasonality and nutrient stoichiometry control dissolved organic matter characterization in a headwater stream".SCIENCE OF THE TOTAL ENVIRONMENT 807(2022):10. |
入库方式： OAI收割
来源：重庆绿色智能技术研究院
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