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<title lang=en>Molecular evidence for recent land use change from a swampy environment to a pond (Lorraine, France)</title>
<creator>Bertrand, O.</creator>
<creator>Mansuy-Huault, L.</creator>
<creator>Montarges-Pelletier, E.</creator>
<creator>Losson, B.</creator>
<creator>Argant, J.</creator>
<creator>Ruffaldi, P.</creator>
<creator>Etienne, D.</creator>
<creator>Garnier, E.</creator>
<creator>Dezileau, Laurent</creator>
<creator>Faure, P.</creator>
<creator>Michels, R.</creator>
<contributor>Géologie et gestion des ressources minérales et énergétiques (G2R) ; Université Henri Poincaré - Nancy 1 (UHP) - Institut National Polytechnique de Lorraine (INPL) - Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire Environnement et Minéralurgie (LEM) ; Institut National Polytechnique de Lorraine (INPL) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire méditerranéen de préhistoire Europe-Afrique (LAMPEA) ; Institut de Recherche pour le Développement (IRD) - Aix Marseille Université (AMU) - Ministère de la Culture et de la Communication (MCC) - Institut national de recherches archéologiques préventives (Inrap) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Laboratoire Chrono-environnement (LCE) ; Université Bourgogne Franche-Comté (UBFC) - Centre National de la Recherche Scientifique (CNRS) - Université de Franche-Comté (UFC)</contributor>
<contributor>Centre de recherche d'histoire quantitative (CRHQ) ; Centre National de la Recherche Scientifique (CNRS) - Université de Caen Normandie (UNICAEN) ; Normandie Université (NU) - Normandie Université (NU)</contributor>
<contributor>Risques ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0146-6380</source>
<source>Organic Geochemistry</source>
<publisher>Elsevier</publisher>
<identifier>hal-00758066</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00758066</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00758066</source>
<source>Organic Geochemistry, Elsevier, 2012, 50, pp.1-10. 〈10.1016/j.orggeochem.2012.06.004〉</source>
<identifier>DOI : 10.1016/j.orggeochem.2012.06.004</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.orggeochem.2012.06.004</relation>
<language>en</language>
<subject lang=fr>Lansquenet (Lorraine)</subject>
<subject lang=fr>pond</subject>
<subject lang=fr>paleoenvironment</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Evidence of a changing environment in the catchment area of a small pond (Lansquenet, Lorraine, France) during the last millennium was provided by coupling palynology data and organic ratios [terrestrial to aquatic ratio: TAR(HC); the C29 vs. C27 sterols, C29/C27(ST); average chain length, ACL and aquatic/macrophytes ratio, Paq]. The depositional and alteration conditions of organic matter (OM) were provided by the 5α(H)-stanols/Δ5-sterols ratio. This study shows that quite simple organic ratios clearly allow identification of the different evolution steps of a watershed, from a swamp to the progressive settlement of a pond. During the swampy period, the C/N(at) (ca. 11.1), TAR(HC) (ca. 36.8), C29/C27(ST) (ca. 8.7) and Paq (<0.3) show a high contribution of allochthonous OM associated with the presence of particular aquatic and mesohygrophilous species. A woody level dated to the XIIIth century reflects the period of the settlement of the pond in a more oxic environment [5α(H)-stanol/Δ5sterol ratio <0.2]. Then, the progressive increase in aquatic input and the development of submerged and floating macrophytes are evidenced by low C/N(at) (<7.6), TAR(HC) (ca. 2.7), C29/C27(ST) (ca. 2) and high Paq (ca. 0.5), suggesting an increase in the water level and eutrophication of the pond. A second oxic event [5α(H)-stanols/Δ5sterols ratio averaging 0.16], associated with extensive OM degradation, corresponds to the most recent dredging in 2002 and reflects an important disturbance of sediments due to pond management.</description>
<date>2012-09</date>
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