The biogeochemistry of carbon across a gradient of streams and rivers within the Congo Basin
Mann, Paul J.
Spencer, Robert G. M.
Dinga, Bienvenu J.
Poulsen, John R.
Hernes, P. J.
Fiske, Gregory J.
Salter, M. E.
Wang, Zhaohui Aleck
Hoering, Katherine A.
Holmes, Robert M.
MetadataShow full item record
Dissolved 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.
Author 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.
Showing items related by title, author, creator and subject.
Minimum information about a marker gene sequence (MIMARKS) and minimum information about any (x) sequence (MIxS) specifications Yilmaz, Pelin; Kottmann, Renzo; Field, Dawn; Knight, Rob; Cole, James R.; Amaral-Zettler, Linda A.; Gilbert, Jack A.; Karsch-Mizrachi, Ilene; Johnston, Anjanette; Cochrane, Guy R.; Vaughan, Robert; Hunter, Christopher; Park, Joonhong; Morrison, Norman; Rocca-Serra, Philippe; Sterk, Peter; Arumugam, Manimozhiyan; Bailey, Mark; Baumgartner, Laura; Birren, Bruce W.; Blaser, Martin J.; Bonazzi, Vivien; Booth, Tim; Bork, Peer; Bushman, Frederic D.; Buttigieg, Pier Luigi; Chain, Patrick S. G.; Charlson, Emily; Costello, Elizabeth K.; Huot-Creasy, Heather; Dawyndt, Peter; DeSantis, Todd; Fierer, Noah; Fuhrman, Jed A.; Gallery, Rachel E.; Gevers, Dirk; Gibbs, Richard A.; San Gil, Inigo; Gonzalez, Antonio; Gordon, Jeffrey I.; Guralnick, Robert P.; Hankeln, Wolfgang; Highlander, Sarah; Hugenholtz, Philip; Jansson, Janet K.; Kau, Andrew L.; Kelley, Scott T.; Kennedy, Jerry; Knights, Dan; Koren, Omry; Kuczynski, Justin; Kyrpides, Nikos C.; Larsen, Robert; Lauber, Christian L.; Legg, Teresa; Ley, Ruth E.; Lozupone, Catherine A.; Ludwig, Wolfgang; Lyons, Donna; Maguire, Eamonn; Methe, Barbara A.; Meyer, Folker; Muegge, Brian; Nakielny, Sara; Nelson, Karen E.; Nemergut, Diana; Neufeld, Josh D.; Newbold, Lindsay K.; Oliver, Anna E.; Pace, Norman R.; Palanisamy, Giriprakash; Peplies, Jorg; Petrosino, Joseph; Proctor, Lita; Pruesse, Elmar; Quast, Christian; Raes, Jeroen; Ratnasingham, Sujeevan; Ravel, Jacques; Relman, David A.; Assunta-Sansone, Susanna; Schloss, Patrick D.; Schriml, Lynn M.; Sinha, Rohini; Smith, Michelle I.; Sodergren, Erica; Spor, Ayme; Stombaugh, Jesse; Tiedje, James M.; Ward, Doyle V.; Weinstock, George M.; Wendel, Doug; White, Owen; Whiteley, Andrew; Wilke, Andreas; Wortman, Jennifer R.; Yatsunenko, Tanya; Glockner, Frank Oliver (2011-01-04)Here we present a standard developed by the Genomic Standards Consortium (GSC) to describe marker gene sequences—the minimum information about a marker gene sequence (MIMARKS). We also introduce a system for describing the ...
McClelland, James W.; Holmes, Robert M.; Peterson, Bruce J.; Raymond, Peter A.; Striegl, Robert; Zhulidov, Alexander V.; Zimov, Sergey; Zimov, Nikita; Tank, Suzanne E.; Spencer, Robert G. M.; Staples, Robin; Gurtovaya, Tatiana Y.; Griffin, Claire G. (John Wiley & Sons, 2016-05-11)Northern rivers connect a land area of approximately 20.5 million km2 to the Arctic Ocean and surrounding seas. These rivers account for ~10% of global river discharge and transport massive quantities of dissolved and ...
von Reden, Karl F.; Roberts, Mark L.; Jenkins, William J.; Rosenheim, Brad E.; McNichol, Ann P.; Schneider, Robert J. (2007-09)The National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility at Woods Hole Oceanographic Institution is presently completing installation of a novel continuous-flow AMS system. A multi-year development of ...