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dc.contributor.authorMann, Paul J.  Concept link
dc.contributor.authorSpencer, Robert G. M.  Concept link
dc.contributor.authorDinga, Bienvenu J.  Concept link
dc.contributor.authorPoulsen, John R.  Concept link
dc.contributor.authorHernes, P. J.  Concept link
dc.contributor.authorFiske, Gregory J.  Concept link
dc.contributor.authorSalter, M. E.  Concept link
dc.contributor.authorWang, Zhaohui Aleck  Concept link
dc.contributor.authorHoering, Katherine A.  Concept link
dc.contributor.authorSix, J.  Concept link
dc.contributor.authorHolmes, Robert M.  Concept link
dc.date.accessioned2014-07-29T19:27:58Z
dc.date.available2014-10-30T08:58:01Z
dc.date.issued2014-04-30
dc.identifier.citationJournal of Geophysical Research: Biogeosciences 119 (2014): 687–702en_US
dc.identifier.urihttps://hdl.handle.net/1912/6768
dc.descriptionAuthor Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Biogeosciences 119 (2014): 687–702, doi:10.1002/2013JG002442.en_US
dc.description.abstractDissolved organic carbon (DOC) and inorganic carbon (DIC, pCO2), lignin biomarkers, and theoptical properties of dissolved organic matter (DOM) were measured in a gradient of streams and rivers within the Congo Basin, with the aim of examining how vegetation cover and hydrology influences the composition and concentration of fluvial carbon (C). Three sampling campaigns (February 2010, November 2010, and August 2011) spanning 56 sites are compared by subbasin watershed land cover type (savannah, tropical forest, and swamp) and hydrologic regime (high, intermediate, and low). Land cover properties predominately controlled the amount and quality of DOC, chromophoric DOM (CDOM) and lignin phenol concentrations (∑8) exported in streams and rivers throughout the Congo Basin. Higher DIC concentrations and changing DOM composition (lower molecular weight, less aromatic C) during periods of low hydrologic flow indicated shifting rapid overland supply pathways in wet conditions to deeper groundwater inputs during drier periods. Lower DOC concentrations in forest and swamp subbasins were apparent with increasing catchment area, indicating enhanced DOC loss with extended water residence time. Surface water pCO2 in savannah and tropical forest catchments ranged between 2,600 and 11,922 µatm, with swamp regions exhibiting extremely high pCO2 (10,598–15,802 µatm), highlighting their potential as significant pathways for water-air efflux. Our data suggest that the quantity and quality of DOM exported to streams and rivers are largely driven by terrestrial ecosystem structure and that anthropogenic land use or climate change may impact fluvial C composition and reactivity, with ramifications for regional C budgets and future climate scenarios.en_US
dc.description.sponsorshipThis work was supported by the National Science Foundation as part of the ETBC Collaborative Research: Controls on the Flux, Age, and Composition of Terrestrial Organic Carbon Exported by Rivers to the Ocean (0851101 and 0851015).en_US
dc.format.mimetypetext/richtext
dc.format.mimetypeapplication/vnd.ms-excel
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2013JG002442
dc.subjectDissolved organic matteren_US
dc.subjectLigninen_US
dc.subjectCDOMen_US
dc.subjectpCO2en_US
dc.subjectAquaticen_US
dc.subjectHydrologyen_US
dc.titleThe biogeochemistry of carbon across a gradient of streams and rivers within the Congo Basinen_US
dc.typeArticleen_US
dc.description.embargo2014-10-30en_US
dc.identifier.doi10.1002/2013JG002442


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