Global effects of agriculture on fluvial dissolved organic matter

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datacite.alternateIdentifier.citationSCIENTIFIC REPORTS,Vol.5,,2015
datacite.alternateIdentifier.doi10.1038/srep16328
datacite.creatorGraeber, Daniel
datacite.creatorBoechat, Iola G.
datacite.creatorEncina Montoya, Francisco
datacite.creatorEsse, Carlos
datacite.creatorGelbrecht, Joerg
datacite.creatorGoyenola, Guillermo
datacite.creatorGuecker, Bjoern
datacite.creatorHeinz, Marlen
datacite.creatorKronvang, Brian
datacite.creatorMeerhoff, Mariana
datacite.creatorNimptsch, Jorge
datacite.creatorPusch, Martin T.
datacite.creatorSilva, Ricky C. S.
datacite.creatorvon Schiller, Daniel
datacite.creatorZwirnmann, Elke
datacite.date2015
datacite.titleGlobal effects of agriculture on fluvial dissolved organic matter
dc.date.accessioned2021-04-30T17:06:07Z
dc.date.available2021-04-30T17:06:07Z
dc.description.abstractAgricultural land covers approximately 40% of Earth's land surface and affects hydromorphological, biogeochemical and ecological characteristics of fluvial networks. In the northern temperate region, agriculture also strongly affects the amount and molecular composition of dissolved organic matter (DOM), which constitutes the main vector of carbon transport from soils to fluvial networks and to the sea, and is involved in a large variety of biogeochemical processes. Here, we provide first evidence about the wider occurrence of agricultural impacts on the concentration and composition of fluvial DOM across climate zones of the northern and southern hemispheres. Both extensive and intensive farming altered fluvial DOM towards a more microbial and less plant-derived composition. Moreover, intensive farming significantly increased dissolved organic nitrogen (DON) concentrations. The DOM composition change and DON concentration increase differed among climate zones and could be related to the intensity of current and historical nitrogen fertilizer use. As a result of agriculture intensification, increased DON concentrations and a more microbial-like DOM composition likely will enhance the reactivity of catchment DOM emissions, thereby fuelling the biogeochemical processing in fluvial networks, and resulting in higher ecosystem productivity and CO2 outgassing.
dc.identifier.urihttp://repositoriodigital.uct.cl/handle/10925/4033
dc.language.isoen
dc.publisherNATURE PUBLISHING GROUP
dc.sourceSCIENTIFIC REPORTS
oaire.resourceTypeArticle
uct.catalogadorWOS
uct.indizacionSCI
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