DOI: 10.1007/s10533-015-0103-6
Scopus记录号: 2-s2.0-84930273077
论文题名: Longitudinal shifts in dissolved organic matter chemogeography and chemodiversity within headwater streams: a river continuum reprise
作者: Mosher J.J. ; Kaplan L.A. ; Podgorski D.C. ; McKenna A.M. ; Marshall A.G.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 124, 期: 2018-01-03 起始页码: 371
结束页码: 385
语种: 英语
英文关键词: Carbon cycling
; DOM
; FT ICR-MS
; Headwater streams
Scopus关键词: carbon cycle
; chemical composition
; concentration (composition)
; dissolved organic matter
; headwater
; hydrological modeling
; longitudinal gradient
; prediction
; streamflow
; streamwater
; water chemistry
英文摘要: We tested a long-standing hypothesis within river ecology, predicted by the River Continuum Concept, that dissolved organic matter (DOM) diversity decreases with stream order. We measured DOM molecular composition across three stream orders in the headwaters of well characterized forested catchments with ultrahigh-resolution mass spectrometry to assess DOM chemogeography and chemodiversity over the spatial scales of climatic regions and fluvial networks. Stream waters with similar dissolved organic carbon (DOC) concentrations in different climatic regions had distinctive DOM compositions, but shared 69.5 % of the 3286 individual chemical formulae detected. DOM compositions common to all watersheds were characterized by abundant lignin-like and tannin-like molecules as well as carboxyl-rich alicyclic-like molecules (CRAM); 50 % of all formulae were found in all streams. Of the roughly 700 unique chemical formulae within a given fluvial network, most were outside the CRAM region within a van Krevelen diagram and 78 to 95 % were restricted to 1st-order streams where diffuse ground water sources surface, coalesce into a channel, and flow downstream. The 1st-order streams within a fluvial network also exhibited the highest formula diversity as well as the greatest numbers of formulae across a broad range of compound classes. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83514
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Stroud Water Research Center, 970 Spencer Rd, Avondale, PA, United States; Future Fuels Institute, Florida State University, Tallahassee, FL, United States; National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, United States; Department of Chemistry & Biochemistry, Florida State University, Tallahassee, FL, United States; Department of Biological Sciences, Marshall University, 1 John Marshall Way, Huntington, WV, United States
Recommended Citation:
Mosher J.J.,Kaplan L.A.,Podgorski D.C.,et al. Longitudinal shifts in dissolved organic matter chemogeography and chemodiversity within headwater streams: a river continuum reprise[J]. Biogeochemistry,2015-01-01,124(2018-01-03)