Show simple item record

dc.contributor.authorBianchi, Thomas S.  Concept link
dc.contributor.authorGaly, Valier  Concept link
dc.contributor.authorRosenheim, Brad E.  Concept link
dc.contributor.authorShields, Michael  Concept link
dc.contributor.authorCui, Xingqian  Concept link
dc.contributor.authorVan Metre, Peter  Concept link
dc.date.accessioned2015-11-24T20:55:44Z
dc.date.available2016-04-10T08:01:15Z
dc.date.issued2015-10-10
dc.identifier.citationGeophysical Research Letters 42 (2015): 7983–7991en_US
dc.identifier.urihttps://hdl.handle.net/1912/7651
dc.descriptionAuthor Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 7983–7991, doi:10.1002/2015GL065595.en_US
dc.description.abstractWe use a dated sediment core from Lake Whittington (USA) in the lower Mississippi River to reconstruct linkages in the carbon cycling and fluvial sediment dynamics over the past 80 years. Organic carbon (OC) sources were characterized using bulk (δ13C, ramped pyrolysis-oxidation (PyrOx) 14C, δ15N, and TN:OC ratios) and compound-specific (lignin phenols and fatty acids, including δ13C and 14C of the fatty acids) analyses. Damming of the Missouri River in the 1950s, other hydrological modifications to the river, and soil conservation measures resulted in reduced net OC export, in spite of increasing OC concentrations. Decreasing δ13C values coincided with increases in δ15N, TN:OC ratios, long-chain fatty acids, and lignin-phenol concentrations, suggesting increased inputs of soil-derived OC dominated by C3 vegetation, mainly resulting from changes in farming practices and crop distribution. However, ramped PyrOx 14C showed no discernible differences downcore in thermochemical stability, indicating a limited impact on soil OC turnover.en_US
dc.description.sponsorshipSupport for the biomarker analyses were provided by the Jon and Beverly Thompson Chair in Geological Sciences at University of Florida. VG was partly supported by the US National Science Foundation (grant OCE-0928582).en_US
dc.format.mimetypeapplication/msword
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherJohn Wiley & Sonsen_US
dc.relation.urihttps://doi.org/10.1002/2015GL065595
dc.subjectOrganic carbon cyclingen_US
dc.subjectPaleoreconstructionen_US
dc.subjectDam reservoirsen_US
dc.subjectBiomarker proxiesen_US
dc.titlePaleoreconstruction of organic carbon inputs to an oxbow lake in the Mississippi River watershed : effects of dam construction and land use change on regional inputsen_US
dc.typeArticleen_US
dc.description.embargo2016-04-10en_US
dc.identifier.doi10.1002/2015GL065595


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record