Enregistrement molécularie de changements d'usage des sols et de pressions anthropiques : l'exemple d'un étang piscicole (Lansquenet, Lorraine)

Abstract : The sedimentary series, collected in terrestrial and aquatic ecosystems, constitute records or archives of the state of a system at a given moment of the past and relate its evolution in relation to natural disturbances and anthropogenic pressure. In the following manuscript, the sedimentary record of a fish pond has been studied using a multidisciplinary approach. In particular, the characterization at the molecular and macromolecular scale of the organic matter in sediments of the pond Lansquenet allowed to reconstruct the history of its watershed. On the basis of biomarkers and molecular ratios (terrestrial to aquatic ratio: TAR(HC), C29/C27(ST), aquatic/macrophyte proxy: Paq, perylene, syringyl/vanillyl, cinnamyl/vanillyl, acid/aldehyde of syringyl and vanillyl units), this work has enabled us to understand, at the scale of a watershed, the changes in organic matter origins (terrestrial and/or aquatic, natural and/or anthropogenic) over a period of several centuries. Moreover, the results unraveled the depositional conditions as well as preservation conditions in the sedimentary profile, directly influenced by land use and human activities. The confrontation of organic geochemical data with sedimentological, mineralogical and palynological data was a real benefit and validated the use of a series of organic compounds as relevant and sensitive biomarkers regarding environmental and paleoenvironmental modifications. This study highlighted thus the succession of use of the Lansquenet site from a swampy area to the settlement of a fish pond punctuated by drier periods
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Olivia Bertrand. Enregistrement molécularie de changements d'usage des sols et de pressions anthropiques : l'exemple d'un étang piscicole (Lansquenet, Lorraine). Sciences de la Terre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0352⟩. ⟨tel-01749484⟩

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