DOI: 10.1002/2013GL058658
论文题名: Mobilization of optically invisible dissolved organic matter in response to rainstorm events in a tropical forest headwater river
作者: Pereira R. ; Isabella Bovolo C. ; Spencer R.G.M. ; Hernes P.J. ; Tipping E. ; Vieth-Hillebrand A. ; Pedentchouk N. ; Chappell N.A. ; Parkin G. ; Wagner T.
刊名: Geophysical Research Letters
ISSN: 0094-10340
EISSN: 1944-10071
出版年: 2014
卷: 41, 期: 4 起始页码: 1202
结束页码: 1208
语种: 英语
英文关键词: DOC
; headwaters
; iDOM
; invisible
; tropics
Scopus关键词: Biological materials
; Carbon dioxide
; Storms
; Dissolved organic carbon
; Dissolved organic matters
; DOC
; headwaters
; iDOM
; invisible
; Organic matter fraction
; Surrounding environment
; Tropics
; carbon dioxide
; concentration (composition)
; dissolved organic matter
; earthquake magnitude
; fractionation
; headwater
; mobilization
; molecular analysis
; optical method
; soil carbon
; topsoil
; tropical forest
; Guyana
英文摘要: This study emphasizes the importance of rainstorm events in mobilizing carbon at the soil-stream interface from tropical rainforests. Half-hourly geochemical/isotopic records over a 13.5 h period from a 20 km2 tropical rainforest headwater in Guyana show an order of magnitude increase in dissolved organic carbon (DOC) concentration in less than 30 mins (10.6-114 mg/L). The composition of DOC varies significantly and includes optically invisible dissolved organic matter (iDOM) that accounts for a large proportion (4-89%) of the total DOC, quantified using size exclusion chromatography (SEC). SEC suggests that iDOM is comprised of low molecular weight organic moieties, which are likely sourced from fresh leaf litter and/or topsoil, as shown in soils from the surrounding environment. Although poorly constrained at present, the presence of iDOM further downstream during the wet season suggests that this organic matter fraction may represent an unquantified source of riverine CO2 outgassing in tropical headwaters, requiring further consideration. Key Points Extremely variable riverine DOC concentration ranging from 10.6 to 114 mg/L iDOM accounts for 4-89% of the DOM pool Large variability of riverine DOM source and composition ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84894288410&doi=10.1002%2f2013GL058658&partnerID=40&md5=1eefe34a41cba9cd28269f99b5ad907e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7604
Appears in Collections: 气候减缓与适应
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作者单位: School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, United Kingdom
Recommended Citation:
Pereira R.,Isabella Bovolo C.,Spencer R.G.M.,et al. Mobilization of optically invisible dissolved organic matter in response to rainstorm events in a tropical forest headwater river[J]. Geophysical Research Letters,2014-01-01,41(4).