On agenda 24 May 2019

  • Joan Llusià (CREAF, Barcelone, Projet Imbalance-P, ERC)

    VOCs are volatile organic molecules. They can be of biological and artificial origin. They are formed by many types of molecules with multiple functional groups and configurations and molecular conformations. The main type of these compounds are the terpenes (isoprenoids) which are a product of the secondary metabolism of vegetables. In addition, they may have other biological and artificial origins. BVOCs produced and emitted by plants apart to their physiological importance as protectors of plants in the face of multiple stresses, they have roles in biotic relationships.
    Tropical soils and vegetation represent globally significant sources of a range of atmospheric gases, including CO2, CO, N2O, NO, CH4, and Volatile Organic Compounds (VOCs).
    There is a lot of information on BVOC emissions from tropical vegetation although more field studies are needed, however there is little information about COVB emissions from tropical soils.
    The importance of terpenes emitted by tropical soils (Amazonian rain forest) in the overall balance of VOCs is currently being seriously considered. Also the isoprene would be seen as a regulator of the climate within the forests and, consequently, their structure.

    Visio conférence

    Adresse IP 194.214.202.146
    Numéro de la conférence 724017
    Mot de passe 9731
    Téléphone ou RNIS +33 (0)4 26 68 73 07

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    Salle Silvolab (Campus de Kourou)

  • Leandro Van Langenhove (Université d'Anvers, Projet Imbalance-P, fonds ERC)

    Phosphorus (P) is an earthbound and finite element and the prospect of constrained access to mineable P resources, combined with rapidly increasing availabilities of carbon (C) and nitrogen (N) to ecosystems, will result in an imminent change in the stoichiometry of these available elements. This change has no equivalent in the Anthropocene and will bear profound, yet, unknown consequences for the Earth System. French Guiana is situated on some of the oldest geological regions in the world that are also among the poorest in P content. In spite of this, complex forest ecosystems with rich biodiversity have developed. In this project, we studied if and how such low P and cation availability controls a range of biological processes (e.g. microbial activity, nitrogen fixation) occurring in forest soil and in trees influencing leaf level C assimilation (e.g. leaf stoichiometry, photosynthesis). To i) gain mechanistic insights how nutrients control ecosystem processes at various levels and ii) to study the impacts of changing nutrient inputs in tropical ecosystems we additionally set up a fully factorial N- and P- addition experiment at two sites in French Guiana, in Paracou and Nouragues. The fertilization has been ongoing for three years and we return to measure a suite of biological variables and processes in both forest soil and trees.

    Visio conférence

    Adresse IP 194.214.202.146
    Numéro de la conférence 724017
    Mot de passe 9731
    Téléphone ou RNIS +33 (0)4 26 68 73 07

    Via un navigateur Web (PC, tablette, smartphone) : lien scopia
    Aide à l’utilisation de ce lien (cf page 9)
    Aide mise à jour Scopia, janvier 2016 (Client)

    Salle Silvolab (Campus de Kourou)

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