中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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
刊名SCIENCE OF THE TOTAL ENVIRONMENT
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
DOI10.1016/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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