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Deep denitrification: Stream and groundwater biogeochemistry reveal contrasted but connected worlds above and below.
Severe, Emilee; Errigo, Isabella M; Proteau, Mary; Sayedi, Sayedeh Sara; Kolbe, Tamara; Marçais, Jean; Thomas, Zahra; Petton, Christophe; Rouault, François; Vautier, Camille; de Dreuzy, Jean-Raynald; Moatar, Florentina; Aquilina, Luc; Wood, Rachel L; LaBasque, Thierry; Lécuyer, Christophe; Pinay, Gilles; Abbott, Benjamin W.
Afiliação
  • Severe E; Lancaster Environmental Centre, Lancaster University, Lancaster, UK; Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA.
  • Errigo IM; Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA; Grupo de Investigación en Biodiversidad, Medio Ambiente y Salud (BIOMAS), Facultad de Ingenierías y Ciencas Aplicadas, Universidad de Las Américas, Quito, Ecuador.
  • Proteau M; Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA.
  • Sayedi SS; Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA.
  • Kolbe T; Section of Hydrogeology and Hydrochemistry, Institute of Geology, Faculty of Geoscience, Geoengineering and Mining, TU Bergakademie Freiberg, Freiberg, Germany.
  • Marçais J; Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (INRAe), RiverLy, Centre de Lyon-Villeurbanne, 69625 Villeurbanne, France.
  • Thomas Z; Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (INRAe), Sol Agro et Hydrosystème Spatialisation, UMR 1069, Agrocampus Ouest, 35042 Rennes, France.
  • Petton C; Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 35000 Rennes, France.
  • Rouault F; Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (INRAe), Sol Agro et Hydrosystème Spatialisation, UMR 1069, Agrocampus Ouest, 35042 Rennes, France.
  • Vautier C; Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 35000 Rennes, France.
  • de Dreuzy JR; Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 35000 Rennes, France; Univ Rennes, CNRS, OSUR (Observatoire des sciences de l'univers de Rennes), UMS 3343, 35000 Rennes, France.
  • Moatar F; RiverLy, INRAE, Centre de Lyon-Grenoble Auvergne-Rhône-Alpes, Lyon, France.
  • Aquilina L; Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 35000 Rennes, France.
  • Wood RL; Department of Biology, Brigham Young University, Provo, UT, USA.
  • LaBasque T; Univ Rennes, CNRS, Géosciences Rennes, UMR 6118, 35000 Rennes, France.
  • Lécuyer C; Univ Lyon 1, CNRS, LGL-TPE, F-69622 Villeurbanne, France.
  • Pinay G; Environnement, Ville & Société (EVS UMR5600), Centre National de la Recherche Scientifique (CNRS), Lyon, France.
  • Abbott BW; Department of Plant and Wildlife Sciences, Brigham Young University, Provo, UT, USA. Electronic address: benabbott@byu.edu.
Sci Total Environ ; 880: 163178, 2023 Jul 01.
Article em En | MEDLINE | ID: mdl-37023812
ABSTRACT
Excess nutrients from agricultural and urban development have created a cascade of ecological crises around the globe. Nutrient pollution has triggered eutrophication in most freshwater and coastal ecosystems, contributing to a loss in biodiversity, harm to human health, and trillions in economic damage every year. Much of the research conducted on nutrient transport and retention has focused on surface environments, which are both easy to access and biologically active. However, surface characteristics of watersheds, such as land use and network configuration, often do not explain the variation in nutrient retention observed in rivers, lakes, and estuaries. Recent research suggests subsurface processes and characteristics may be more important than previously thought in determining watershed-level nutrient fluxes and removal. In a small watershed in western France, we used a multi-tracer approach to compare surface and subsurface nitrate dynamics at commensurate spatiotemporal scales. We combined 3-D hydrological modeling with a rich biogeochemical dataset from 20 wells and 15 stream locations. Water chemistry in the surface and subsurface showed high temporal variability, but groundwater was substantially more spatially variable, attributable to long transport times (10-60 years) and patchy distribution of the iron and sulfur electron donors fueling autotrophic denitrification. Isotopes of nitrate and sulfate revealed fundamentally different processes dominating the surface (heterotrophic denitrification and sulfate reduction) and subsurface (autotrophic denitrification and sulfate production). Agricultural land use was associated with elevated nitrate in surface water, but subsurface nitrate concentration was decoupled from land use. Dissolved silica and sulfate are affordable tracers of residence time and nitrogen removal that are relatively stable in surface and subsurface environments. Together, these findings reveal distinct but adjacent and connected biogeochemical worlds in the surface and subsurface. Characterizing how these worlds are linked and decoupled is critical to meeting water quality targets and addressing water issues in the Anthropocene.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Água Subterrânea / Rios Tipo de estudo: Prognostic_studies Limite: Humans Idioma: En Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Água Subterrânea / Rios Tipo de estudo: Prognostic_studies Limite: Humans Idioma: En Ano de publicação: 2023 Tipo de documento: Article