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.

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Aide mise à jour Scopia, janvier 2016 (Client)