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Complementary N uptake strategies between tree species in tropical rainforest

Roggy J.C., Schimann H., Sabatier D., Molino J.F., Freycon V., Domenach A.M.. 2014. International Scholarly Research Notices, 2014 (ID427194) : 6 p..

Within tree communities, the differential use of soil N mineral resources, a key factor in ecosystem functioning, may reflect functional complementarity, a major mechanism that could explain species coexistence in tropical rainforests. Eperua falcata and Dicorynia guianensis, two abundant species cooccurring in rainforests of French Guiana, were chosen as representative of two functional groups with complementary N uptake strategies (contrasting leaf ?15N signatures related to the ?15N of their soil N source, or ). The objectives were to investigate if these strategies occurred under contrasted soil N resources in sites with distinct geological substrates representative of the coastal rainforests. Results showed that species displayed contrasting leaf ?15N signatures on both substrates, confirming their complementary N uptake strategy. Consequently, their leaf 15N can be used to trace the presence of inorganic N-forms in soils ( and ) and thus to indicate the capacity of soils to provide each of these two N sources to the plant community. (Résumé d'auteur)

Mots-clés : chimie du sol; transport des substances nutritives; facteur édaphique; eperua falcata; biodiversité; composition botanique; écosystème forestier; analyse de tissu foliaire; nutrition des plantes; cycle de l'azote; forêt tropicale humide; guyane française; dicorynia guianensis

Thématique : Foresterie - Considérations générales; Physiologie végétale : nutrition; Chimie et physique du sol; Ecologie végétale

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