DOI: 10.1016/j.watres.2018.12.004
Scopus记录号: 2-s2.0-85058233598
论文题名: Characterization of CDOM in saline and freshwater lakes across China using spectroscopic analysis
作者: Song K. ; Shang Y. ; Wen Z. ; Jacinthe P.-A. ; Liu G. ; Lyu L. ; Fang C.
刊名: Water Research
ISSN: 431354
出版年: 2019
起始页码: 403
结束页码: 417
语种: 英语
英文关键词: Absorption
; CDOM
; EEMs
; Freshwater
; Saline water
Scopus关键词: Absorption
; Biological materials
; Fluorescence
; Lakes
; Light absorption
; Spectroscopic analysis
; Water absorption
; CDOM
; Colored dissolved organic matter
; EEMs
; Excitation emission matrices
; Fluorescence intensities
; Freshwater
; Humic-like substances
; Low molecular weight compounds
; Saline water
; dissolved organic matter
; fresh water
; lake water
; sodium chloride
; absorption
; carbon cycle
; chemical compound
; chemical reaction
; concentration (composition)
; detection method
; dissolved organic matter
; humic substance
; lacustrine environment
; lake water
; saline lake
; spectroscopy
; altitude
; Article
; China
; concentration (parameters)
; fluorescence
; light absorption
; photooxidation
; priority journal
; salinity
; salt lake
; spectroscopy
; China
英文摘要: Colored dissolved organic matter (CDOM) is a major component of DOM in waters, and plays a vital role in carbon cycling in inland waters. In this study, the light absorption and three-dimensional excitation-emission matrix spectra (EEMs) of CDOM of 936 water samples collected in 2014–2017 from 234 lakes in five regions across China were examined to determine relationships between lake water sources (fresh versus saline) and their fluorescence/absorption characteristics. Results indicated significant differences regarding DOC concentration and a CDOM (254) between freshwater (6.68 mg C L −1 , 19.55 m -1 ) and saline lakes (27.4 mg C L −1 , 41.17 m -1 ). While humic-like (F 5 ) and fulvic-like (F 3 ) compounds contributed to CDOM fluorescence in all lake waters significantly, their contribution to total fluorescence intensity (F T ) differed between saline and freshwater lakes. Significant negative relationships were also observed between lake altitude with either F 5 (R 2 = 0.63, N = 306) or F T (R 2 = 0.64, N = 306), suggesting that the abundance of humic-like materials in CDOM tends to decrease with increased in lakes altitude. In high-altitude lakes, strong solar irradiance and UV exposure may have induced photo-oxidation reactions resulting in decreased abundance of humic-like substances and the formation of low molecular weight compounds. These findings have important implications regarding our understanding of C dynamics in lacustrine systems and the contribution of these ecosystems to the global C cycle. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122080
Appears in Collections: 气候变化事实与影响
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作者单位: Northeast Institute of Geography and Agroecology, CAS, Changchun, 130102, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Earth Sciences, Indiana University-Purdue University IndianapolisIN, United States
Recommended Citation:
Song K.,Shang Y.,Wen Z.,et al. Characterization of CDOM in saline and freshwater lakes across China using spectroscopic analysis[J]. Water Research,2019-01-01