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| Titre : |
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.
|
| Auteur(s) : |
Jean-Chirstophe Roggy, Auteur (et co-auteur)
Marie Françoise Prévost, Auteur (et co-auteur) F. Gourbiere, Auteur (et co-auteur) H. Casabianca, Auteur (et co-auteur) J. Garbaye, Auteur (et co-auteur) |
| Type de document : | Tiré à part |
| Sujets : | Guyane française ; Amérique du Sud ; Forêt tropicale humide ; Symbiose ; Fixation de l'azote ; Légumineuse |
| 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 δ15N and total leaf N varied widely (-1 ≤ δ15N (‰) ≤ 7 and 1 ≤ leaf N(%) ≤ 3.2) suggesting possible distinctions between diazotrophic and non-fixing plants. The δ15N also revealed two statistically distinct groups of non-N2-fixing species (δ15N = 5.14 ± 0.3 vs δ15N = 1.65 ± 0.17) related to the different ecological behaviors of these species in the successional processes. We conclude that the δ15N signature of plant leaves combined with their total N concentration [...] 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 δ15N and total leaf N varied widely (-1 ≤ δ15N (‰) ≤ 7 and 1 ≤ leaf N(%) ≤ 3.2) suggesting possible distinctions between diazotrophic and non-fixing plants. The δ15N also revealed two statistically distinct groups of non-N2-fixing species (δ15N = 5.14 ± 0.3 vs δ15N = 1.65 ± 0.17) related to the different ecological behaviors of these species in the successional processes. We conclude that the δ15N 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 δ15N of the non-N2-fixing species, N2-fixing groups can still be identified, provided that plants are simultaneously classified taxonomically, by their leaf δ15N and total N concentration and by the presence or absence of nodules. The variability in the δ15N of the non-fixing species is discussed. |
| Editeur(s) : | Springer Verlag |
| Date de publication : | 1999 |
| Format : | pp. 171-182 / tabl., réf. |
| Note(s) : |
Extrait de Oecologia - Vol.120 - n°2 |
| Langue(s) : | Anglais |
| Lien vers la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=150159 |
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| Localisation | Emplacement | Pôle | Section | Cote | Support | Disponibilité |
|---|---|---|---|---|---|---|
| Kourou | Archives | AgroParisTech-Kourou | UMR.412 | Papier Périodique | Empruntable Disponible |