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New insights into mechanisms of sunlight- and dark-mediated high-temperature accelerated diurnal production-degradation of fluorescent DOM in lake waters

文献类型：期刊论文

作者Yang, Xuemei6,7; Yuan, Jie5; Yue, Fu-Jun6,7; Li, Si-Liang6,7; Wang, Baoli6,7; Mohinuzzaman, Mohammad6,7; Liu, Yijun6,7; Senesi, Nicola1; Lao, Xinyu6,7; Li, Longlong6,7
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2021-03-15
卷号760页码:14
关键词Fluorescent dissolved organic matter (FDOM) Sunlight-mediated processes Dark-mediated microbial processes Transformation of FDOM Water samples Closed lakes
ISSN号0048-9697
DOI10.1016/j.scitotenv.2020.143377
英文摘要The production of fluorescent dissolved organic matter (FDOM) by phytoplankton and its subsequent degradation, both of which occur constantly under diurnal-day time sunlight and by night time dark-microbial respiration processes in the upper layer of surface waters, influence markedly several biogeochemical processes and functions in aquatic environments and can be feasibly related to global warming (GW). In this work sunlight-mediated high-temperature was shown to accelerate the production of FDOM, but also its complete disappearance over a 24-h diurnal period in July at the highest air and water temperatures (respectively, 41.1 and 33.5 degrees C), differently from lower temperature months. Extracellular polymeric substances (EPS), an early-state DOM, were produced by phytoplankton in July in the early morning (6:00-9:00), then they were degraded into four FDOM components over midday (10:00-15:00), which was followed by simultaneous production and almost complete degradation of FDOM with reformation of EPS during the night (2:00-6:00). Such transformations occurred simultaneously with the fluctuating production of nutrients, dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and the two isotopes (delta N-15 and delta O-18) of NO3-. It was estimated that complete degradation of FDOM in July was associated with mineralization of approximately 15% of the initial DOC, which showed a nighttime minimum (00:00) in comparison to a maximum at 13:00. FDOM identified by excitation-emission matrix spectroscopy combined with parallel factor analysis consisted of EPS, autochthonous humic-like substances (AHLS) of C- and M-types, a combined formof C- andM-types of AHLS, protein-like substances (PLS), newly-released PLS, tryptophan-like substances, tyrosine-like substances (TYLS), a combined form of TYLS and phenylalanine-like substances (PALS), and their degradation products. Finally, stepwise degradation and production processes are synthesized in a pathway for FDOM components production and their subsequent transformation under different diurnal temperature conditions, which provided a broader paradigm for future impacts on GW-mediated DOM dynamics in lake water. (C) 2020 Elsevier B.V. All rights reserved.
WOS关键词DISSOLVED ORGANIC-MATTER ; EXTRACELLULAR POLYMERIC SUBSTANCES ; EXCITATION-EMISSION MATRIX ; PHOTOCHEMICAL PRODUCTION ; SPIRULINA-PLATENSIS ; HYDROGEN-PEROXIDE ; HYDROXYL RADICALS ; BY-PRODUCTS ; CARBON ; MARINE
资助项目National Key Research and Development Program of China[2016YFA0601000] ; National Natural Science Foundation of China[U1612441] ; Key Construction Program of the National "985" Project, Tianjin University, China
WOS研究方向Environmental Sciences & Ecology
语种英语
WOS记录号WOS:000607779400044
出版者ELSEVIER
资助机构National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Construction Program of the National "985" Project, Tianjin University, China ; Key Construction Program of the National "985" Project, Tianjin University, China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Construction Program of the National "985" Project, Tianjin University, China ; Key Construction Program of the National "985" Project, Tianjin University, China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Construction Program of the National "985" Project, Tianjin University, China ; Key Construction Program of the National "985" Project, Tianjin University, China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Construction Program of the National "985" Project, Tianjin University, China ; Key Construction Program of the National "985" Project, Tianjin University, China
源URL[http://ir.iggcas.ac.cn/handle/132A11/100026]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Mostofa, Khan M. G.
作者单位1.Univ Bari Aldo Moro, Dip To Sci Suolo Pianta & Alimenti, Via G Amendola 165-A, I-70126 Bari, Italy
2.Ctr Interdipartimentale NatRisk, Via Leonardo da Vinci 44, I-10095 Grugliasco, TO, Italy
3.Univ Torino, Dipartimento Chim, Via P Giuria 5, I-10125 Turin, Italy
4.Scottish Univ Environm Res Ctr, Rankine Ave,Scottish Enterprise Technol Pk, E Kilbride G75 0QF, Lanark, Scotland
5.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beitucheng Western Rd, Beijing 100029, Peoples R China
6.Tianjin Univ, Tianjin Key Lab Earth Crit Zone Sci & Sustainable, 92 Weijin Rd, Tianjin 300072, Peoples R China
7.Tianjin Univ, Inst Surface Earth Syst Sci, 92 Weijin Rd, Tianjin 300072, Peoples R China
推荐引用方式
GB/T 7714		 Yang, Xuemei,Yuan, Jie,Yue, Fu-Jun,et al. New insights into mechanisms of sunlight- and dark-mediated high-temperature accelerated diurnal production-degradation of fluorescent DOM in lake waters[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,760:14.
APA Yang, Xuemei.,Yuan, Jie.,Yue, Fu-Jun.,Li, Si-Liang.,Wang, Baoli.,...&Mostofa, Khan M. G..(2021).New insights into mechanisms of sunlight- and dark-mediated high-temperature accelerated diurnal production-degradation of fluorescent DOM in lake waters.SCIENCE OF THE TOTAL ENVIRONMENT,760,14.
MLA Yang, Xuemei,et al."New insights into mechanisms of sunlight- and dark-mediated high-temperature accelerated diurnal production-degradation of fluorescent DOM in lake waters".SCIENCE OF THE TOTAL ENVIRONMENT 760(2021):14.

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来源：地质与地球物理研究所

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