Leaf natural 15N abundance and total N concentration as potential indicators of plant N nutrition in legumes and pioneer species in a rain forest of French Guiana - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Oecologia Année : 1999

Leaf natural 15N abundance and total N concentration as potential indicators of plant N nutrition in legumes and pioneer species in a rain forest of French Guiana

Résumé

The suitability of the natural 15N abundance and of total N concentration of leaves as indicators of the type of plant N nutrition in a rain forest of French Guiana were tested. Leaf samples from primary legume species, non-legumes (pioneer species) and from the non-N2-fixing species Dicorynia guianensis were analyzed. Both '15N and total leaf N varied widely (m1 r '15N (‰) r 7 and 1 r leaf N(%) r 3.2) suggesting possible distinctions between diazotrophic and non-fixing plants. The '15N also revealed two statistically distinct groups of non-N2-fixing species ('15N = 5.14 - 0.3 vs '15Nv=v1.65 - 0.17) related to the different ecological behaviors of these species in the successional processes. We conclude that the '15N signature of plant leaves combined with their total N concentration may be relevant indicators for identifying functional groups within the community of non-N2-fixing species, as well as for detecting diazotrophy. Despite the variability in the '15N of the non-N2-fixing species, N2-fixing groups can still be identified, provided that plants are simultaneously classified taxonomically, by their leaf '15N and total N concentration and by the presence or absence of nodules. The variability in the '15N of the non-fixing species is discussed.

Dates et versions

hal-01031454 , version 1 (22-07-2014)

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Jean-Christophe Roggy, M. F. Prévost, F. Gourbiere, H. Casabianca, Jean Garbaye, et al.. Leaf natural 15N abundance and total N concentration as potential indicators of plant N nutrition in legumes and pioneer species in a rain forest of French Guiana. Oecologia, 1999, 120 (2), pp.171-182. ⟨10.1007/s004420050846⟩. ⟨hal-01031454⟩
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