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Variations of plant and soil 87Sr/86Sr along the slope of a tropical inselberg / Anne Poszwa in Annals of Forest Science, Vol 66 n° 5 (July - August 2009)  

Public [article]  inAnnals of Forest Science > Vol 66 n° 5 (July - August 2009) . - n° 512 Titre : Variations of plant and soil 87Sr/86Sr along the slope of a tropical inselberg Titre original : Variation des rapports 87Sr/86Sr dans les sols et les plantes d'un inselberg tropical Type de document : Article/Communication Auteurs : Anne Poszwa, Auteur ; Bruno Ferry, Auteur ; Benoît Pollie, Auteur ; Catherine Grimaldi, Auteur ; Pierre Charles-Dominique, Auteur ; Michel Loubet, Auteur ; Etienne Dambrine, Auteur Année de publication : 2009 Article en page(s) : n° 512 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] Guyane (département français) [Termes IGN] inselberg [Termes IGN] milieu tropical [Termes IGN] montagne [Termes IGN] nutriment végétal [Termes IGN] sol [Termes IGN] strontium Résumé : (auteur) From the summit downslope a granitic inselberg in French Guiana, soils and vegetation evolve from bare granite covered by cyanobacteria, to a savannah-type vegetation on thin patchy sandy accumulations, then to a low forest on shallow young soils and to a high forest on deep highly weathered ultisols. We have used element budgets and Sr isotopic variations in soils and plants to investigate the mineral nutrient supply sources of the different plant communities. Granite and atmospheric deposition have 87Sr/86Sr ratios of 1.3 and 0.71, respectively. The 87Sr/86Sr ratio of cyanobacteria (0.72) suggests granite weathering by cyanobacteria crusts. The 87Sr/86Sr ratio of the savannah-type vegetation is 0.73 and varies between 0.75 and 0.76 in the low and high forest leaf litter regardless of soil depth, age and degree of impoverishment. These almost constant ratio suggest that forest Sr comes from rainwater and from the summit of this inselberg, where it is released and redistributed along the slope, by surface flow, lateral redistribution of litter, and mineral particles. However, because of its very low content in the rock and soils, Ca is supplied to plants by atmospheric deposition. Numéro de notice : A2009-646 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1051/forest/2009036 Date de publication en ligne : 09/07/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/05/f08214/f08214.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72470 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
IFN-001-P000455	PER	Revue	Nogent-sur-Vernisson	Salle périodiques	Exclu du prêt