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Sources of dissolved organic carbon in small volcanic mountainous tropical rivers, examples from Guadeloupe (French West Indies)

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  • Additional Information
    • Contributors:
      Laboratoire Génie Civil et Géo-Environnement Béthune (LGCgE); Université d'Artois (UA); Institut de Physique du Globe de Paris (IPGP); Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS); Observatoire Volcanologique et Sismologique de Guadeloupe (OVSG); Institut de Physique du Globe de Paris (IPG Paris); School of Earth Sciences Bristol; University of Bristol Bristol; Institut d'écologie et des sciences de l'environnement de Paris (iEES); Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS); Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO); Bureau de Recherches Géologiques et Minières (BRGM)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS); Biogéosystèmes Continentaux - UMR7327; Bureau de Recherches Géologiques et Minières (BRGM)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS); Université de Toulon - UFR Lettres et Sciences Humaines (UTLN UFR LSH); Université de Toulon (UTLN); INSU-CNRS (PPF OBSERA)
    • Publication Information:
      CCSD
      Elsevier
    • Publication Date:
      2016
    • Collection:
      Université d'Artois: HAL
    • Abstract:
      International audience ; In the tropical zone, small watersheds are affected by intense meteorological events. These events play an important role in the erosion of soils and therefore on the sources of organic carbon in small tropical rivers. We studied the geochemistry of two soils on Basse-Terre Island (French West Indies, FWI): ferralitic soil and Andosol. The two studied soils are very similar in terms of soil organic matter (SOM) and soil solution parameters. The total organic carbon (TOC) and total nitrogen (TN) contents vary between 1.7 and 92 g kg‐1 and between 0.1 and 5.5 g kg‐1, respectively, with the highest concentrations observed in the topsoil. The C/N ratios are relatively constant throughout the soil profiles (ca. 12). The carbon isotopic composition of SOM varies between ‐27.3‰ and ‐22.7‰ and presents an enrichment with increasing depth of soil profiles. Dissolved organic carbon (DOC) concentrations in soil solutions, varying from 3.2 to 91.3 mg L‐1, are similar for the both extraction used in lab (with milliQ water and Ca(NO3)2) but are higher than those measured in soil solutions sampled from lysimeters (0.65–1.46 mg L‐1). The isotopic compositions of DOC obtained by extractions and SOM are comparable, with δ13C values ranging from ‐28.6‰ to ‐25.8‰. The DOC sampled from lysimeters is systematically depleted in 13C compared to DOC obtained by extractions, with δ13C values of ‐33.8‰ to ‐30.6‰. The enrichment of δ13C of SOM through the soil profiles is either consistent with the carbon isotopic fractionation of SOM by decomposing organisms, or the differential mineralization of both labile and stable carbon stocks in soils. DOC concentrations in stream waters vary between 0.46 and 5.75 mg L‐1, and are generally lower during low water level than floods. The isotopic compositions of DOC in the rivers range from ‐38.9‰ to ‐27.2‰, with δ13C values, which are more depleted in 13C during low water level than flood events. The δ13CDOC of water river samples and soil solutions obtained by extraction and ...
    • Accession Number:
      10.1016/j.geoderma.2016.07.014
    • Online Access:
      https://insu.hal.science/insu-01352450
      https://insu.hal.science/insu-01352450v1/document
      https://insu.hal.science/insu-01352450v1/file/LLoret-Geodermav2-2016.pdf
      https://doi.org/10.1016/j.geoderma.2016.07.014
    • Rights:
      http://creativecommons.org/licenses/by-nc-nd/ ; info:eu-repo/semantics/OpenAccess
    • Accession Number:
      edsbas.826CC281