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Theses

Production et devenir du carbone organique fossile libéré par les altérations mécaniques et chimiques des formations marneuses : exemple des « terres noires » des bassins versants expérimentaux de Draix (Alpes de Haute Provence, France).

Abstract : Initiated within the framework of GIS Draix « mountains erosion study), this work relates to the debate on the fossil organic carbon (FOC) input in modern environments and its possible implications for the carbon cycle. It focuses on the fate of FOC released by of jurassic marls weathering occuring in Draix watersheds (Alpes de haute Provence, France). Such work needed to : - confirm FOC occurrence both in weathered rocks, soils and riverine particles (multi-analytical approach); - quantify FOC losses during pools transitions by using a new analytical method (quantitative palynofacies) and combining field and experimental investigations; - estimate and model FOC fluxes released both by chemical and mechanical weathering in the studied watersheds. Obtained results permit us to : - point out FOC resistance to weathering processes. FOC losses only occur during chemical one and do not exceed 30 %. - highlight fossil organic matter plurality composed with labile and refractory components ; - hierarchize fluxes controlling factors such as vegetal cover, slope,and precipitations ; - emphasize FOC fluxes importance, expressed in t/ha/y, released by jurassic marls weathering at local and regional scales.
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https://tel.archives-ouvertes.fr/tel-00426401
Contributor : Nathalie Pothier <>
Submitted on : Monday, October 26, 2009 - 10:33:36 AM
Last modification on : Friday, October 23, 2020 - 4:33:42 PM
Long-term archiving on: : Thursday, June 17, 2010 - 5:21:22 PM

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  • HAL Id : tel-00426401, version 1

Citation

Yann Graz. Production et devenir du carbone organique fossile libéré par les altérations mécaniques et chimiques des formations marneuses : exemple des « terres noires » des bassins versants expérimentaux de Draix (Alpes de Haute Provence, France).. Géochimie. Université d'Orléans, 2009. Français. ⟨tel-00426401⟩

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