Variation throughout the year of N2 fixation of Acacia mangium in pure stand or in association with Eucalyptus grandis

Paula Ranieri Ribeiro, Bouillet Jean-Pierre, Gonçalves José Leonardo M., Laclau Jean-Paul, Trivelin Paulo. 2014. Variation throughout the year of N2 fixation of Acacia mangium in pure stand or in association with Eucalyptus grandis. International Forestry Review, 16 (5), n.spéc. XXIV IUFRO World Congress abstracts, Résumé : p. 367. IUFRO World Congress. Sustaining Forests, Sustaining People: The Role of Research. 24, Salt Lake City, États-Unis, 5 Octobre 2014/11 Octobre 2014.

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Quartile : Q3, Sujet : FORESTRY

Résumé : N2-fixation by leguminous trees can be an important source of nitrogen in forest plantations, but little is known about its seasonal variations. We estimated N2-fi xation by Acacia mangium growing in pure stands (100A) and in association with Eucalyptus grandis (50A:50E) in Brazil. At 27 months of age, we applied ammonium sulphate (99.8 atom % 15N) diluted in water (1.1 kg N/ha) to the litter. Every 3 months during one year we selected four trees per species in each treatment and collected all the leaves from two branches distributed in each third of the canopy. The average percent of N derived from fi xation (%Ndfa) was 70.3±5.2% and 48.1±10.8% in 50A:50E and in 100A, respectively. The higher %Ndfa in mixture could be due to lower soil N availability than in 100A and to strong competition of Eucalyptus over Acacia for soil N uptake. The highest and lowest values of %Ndfa were observed at the end and at the beginning of the rainy season, respectively. N2-fixation showed lower seasonal variations in 50A:50E than in 100A. In this last treatment, %Ndfa was about 30% higher at the end of the rainy season than during other periods.

Mots-clés Agrovoc : Acacia mangium, Eucalyptus grandis, Fixation biologique de l'azote, culture associée, culture en mélange, variation saisonnière

Mots-clés géographiques Agrovoc : Brésil

Mots-clés libres : Acacia, Nitrogen fixing tree, Mixed species plantation, Eucalyptus, Brazil

Classification Agris : F60 - Physiologie et biochimie végétale
F08 - Systèmes et modes de culture

Champ stratégique Cirad : Axe 2 (2014-2018) - Valorisation de la biomasse

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