Carbon isotopes as tracers of dissolved organic carbon sources and water pathways in headwater catchments

Lambert, Thibault; Pierson-Wickmann, Anne-Catherine; Gruau, Gérard; Thibault, Jean-Noel; Jaffrézic, Anne

doi:10.1016/j.jhydrol.2011.03.014

Cited by 67 publications

(106 citation statements)

References 41 publications

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“…Previous work performed in the Kervidy-Naizin catchment (Morel et al, 2009) and in other headwater catchments (Inamdar and Mitchell, 2006;Van Gaelen et al, 2014) have shown that during base flow periods, the stream water was mostly sustained by deep and shallow groundwater. However, during storm events, the increase in discharge was mostly due to the increase in the soil solution contribution (Lambert et al, 2011;Morel et al, 2009). As the same modifications were recorded in the soil solution and stream DOM composition during storm events, the soil solution may be a possible origin of stream water DOM modification during storm events.…”

Section: Are These Modifications Recorded In the Stream Dom?mentioning

confidence: 67%

“…When considering annual river DOM fluxes, more than 50 % is exported during storm events (Buffam et al, 2001;Morel et al, 2009;Raymond and Saiers, 2010). This largest export is attributed to the rise of the water table in organic-rich soil horizons which become hydrologically connected to the river (Boyer et al, 1996), and to 5040 M. Denis et al: New molecular evidence for surface and sub-surface soil erosion controls the fact that river discharge is mostly sustained by soil water fluxes during storm events (Hagedorn et al, 2000;Lambert et al, 2011). Storm events are also responsible for the modification of the dissolved organic carbon (DOC) concentration and fluxes in soils.…”

Section: Introductionmentioning

confidence: 99%

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New molecular evidence for surface and sub-surface soil erosion controls on the composition of stream DOM during storm events

et al. 2017

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Abstract. Storm events are responsible for more than 60 % of the export of dissolved organic matter (DOM) from headwater catchments due to an increase in both the discharge and concentration. The latter was attributed to changing water pathways inducing the mobilization of DOM from the surface soil horizons. Recent molecular investigations have challenged this view and hypothesized (i) a contribution of an in-stream partition of organic matter (OM) between eroded particles and the dissolved fraction and (ii) the modification of the composition of soil DOM during storm events. To investigate these assumptions, soil solutions in the macropores, surface runoff and stream outlet were sampled at high frequency during three storm events in the KervidyNaizin catchment, part of the French critical zone observatory AgrHyS. The molecular composition of the DOM was analysed by thermally assisted hydrolysis and methylation (THM) with tetramethylammonium hydroxide (TMAH) coupled to a gas chromatograph and a quadrupole mass spectrometer. These analyses highlighted a modification of the DOM composition in soil solution controlled by the watertable dynamic and pre-event hydrological conditions. These findings fit with the mechanism of colloidal and particulate destabilization in the soil macroporosity. The different behaviour observed for lignins, carbohydrates and fatty acids highlights a potential chemical segregation based on their hydrophobicity. The composition of surface runoff DOM is similar to the DOM composition in soil solution and could be generated by the same mechanism. The DOM composition in both soil solution and surface runoff corresponds to the stream DOM composition observed during storm events. On the basis of these results, modifications of the stream DOM composition during storm events seem to be due to surface and sub-surface soil erosion rather than in-stream production.

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Section: Are These Modifications Recorded In the Stream Dom?mentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

New molecular evidence for surface and sub-surface soil erosion controls on the composition of stream DOM during storm events

et al. 2017

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“…Approach: monitoring phosphorus speciation in soil water in wetlands and in stream water Two riparian wetlands were equipped with water traps (microlysimeters) to collect soil water, and samples were taken over several seasons (Morel et al, 2009;Lambert et al, 2011). In 2013, i.e.…”

Section: Environmental Issue: Toward Global Nutrient Cycling In Catchmentioning

confidence: 99%

Evolution of scientific questions over 50 years in the Kervidy-Naizin catchment: from catchment hydrology to integrated studies of biogeochemical cycles and agroecosystems in a rural landscape

Gascuel‐Odoux

Fovet

Gruau

et al. 2018

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ABSTRACT. Catchment studies on water quality started in the 1960s, when scientists identified longterm environmental impacts and realized the complexity involved in environmental degradation P A P E R A C C E P T E D . P R E -P R I N T V E R S I O NGascuel-Odoux et al. Key words: research catchment, long-term monitoring, interdisciplinary research, environmental observatoryPalabras clave: cuenca de investigación; monitoreo a largo plazo; investigación interdisciplinar; observatorio medioambiental.

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“…Ces travaux, servant à constituer les hypothèses de départ, portaient sur un élément (ou groupe d'éléments iso-chimiques) comme le nitrate [Molénat et al, 2005 ;Molénat et al, 2008], le COD [Lambert et al, 2011 ;Morel et al, 2009] ou encore sur les terres rares [Dia et al, 2000] (la liste des publications est loin d'être exhaustive).…”

Section: Un Site D'étude Remarquable Qui Permet Un Questionnement unclassified

Motifs temporels de la qualité de l'eau. Analyse d'une décennie de données haute-fréquence mesurées dans un observatoire agro-hydrologique

2015

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RÉSUMÉ. -Le présent article est une synthèse de doctorat, portant sur l'analyse de données issues du bassin versant agricole Kervidy-Naizin, appartenant à l'Observatoire de Recherche en Environnement (ORE) AgrHys. Dès 2000, face aux enjeux de la qualité de l'eau et du changement climatique, le site a bénéficié d'un suivi hydrologique et chimique particulièrement fin. Les travaux présentés ci-après sont la première exploration de l'ensemble des chroniques longues de 12 ans du site de Kervidy-Naizin. Ces chroniques remarquables ont permis de répondre aux questions suivantes : quels sont les processus hydrologiques qui contrôlent les exportations de solutés dans le bassin versant ? Comment la dynamique temporelle d'humectation du bassin influence ces processus dominants ? Quatre méthodes originales d'analyse fonctionnelle du bassin versant ont permis de répondre, en étudiant les trois niveaux de variabilité temporelle : la crue, la saisonnalité et les variations interannuelles. Ainsi, un modèle conceptuel d'exportation des solutés à quatre compartiments est proposé pour expliquer la diversité des dynamiques d'exportation dans ce bassin. Ces résultats montrent une structuration temporelle du signal de qualité de l'eau. Le signal, marqué pour certains solutés par l'activité agricole intensive, est dominé par la saisonnalité et varie sensiblement selon les conditions hydrométéorologiques de l'année, et notamment le changement d'état d'humidité du bassin.Mots-clés : qualité de l'eau, chronique temporelle, observatoire long terme, variabilité temporelle, climat Temporal patterns of water quality: decadal high-frequency data-driven analysis from an hydrological observatory under agricultural land-useABSTRACT. -The article synthetises PhD research on hydrological and hydrochemical data analyses from Kervidy-Naizin agricultural catchment (belonging to the Environmental Research Observatory AgrHys, itself part of the RBV network of French hydrological research catchments). Due to water quality and climate change issues, the catchment was heavily monitored as early as 2000. The data-driven analyses presented hereafter consider for the first time the whole 12-year long dataset. Such outstanding time-series enabled to address the following questions: which hydrological processes are controlling solutes exports in the catchment? How does the wetness state dynamic influences these dominant processes? Four original methods are used covering the range of temporal variability from flood event to seasonality and its inter-annual variations. A solute export conceptual model, composed of four hydrological compartments was proposed to explain the diversity of export dynamics for the catchment. Years presenting extrem hydro-meteorological conditions support this model, and emphasise on the importance of the change of catchment wetness state. Flood events also depend on that. Lastly, downslope advection and dispersion as well as riparian production, retention or mixing are also no negligible processes taking place in the catchment. Water...

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Carbon isotopes as tracers of dissolved organic carbon sources and water pathways in headwater catchments

Cited by 67 publications

References 41 publications

New molecular evidence for surface and sub-surface soil erosion controls on the composition of stream DOM during storm events

New molecular evidence for surface and sub-surface soil erosion controls on the composition of stream DOM during storm events

Evolution of scientific questions over 50 years in the Kervidy-Naizin catchment: from catchment hydrology to integrated studies of biogeochemical cycles and agroecosystems in a rural landscape

Motifs temporels de la qualité de l'eau. Analyse d'une décennie de données haute-fréquence mesurées dans un observatoire agro-hydrologique

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