Evidence of short-term belowground transfer of nitrogen from Acacia mangium to Eucalyptus grandi trees in a tropical planted forest

Ribeiro Paula Ranieri, Bouillet Jean-Pierre, Trivelin P.C.O., Zeller Bernd, De Moraes Gonçalves Jose Leonardo, Nouvellon Yann, Bouvet Jean-Marc, Plassard Claude, Laclau Jean-Paul. 2015. Evidence of short-term belowground transfer of nitrogen from Acacia mangium to Eucalyptus grandi trees in a tropical planted forest. Soil Biology and Biochemistry, 91 : pp. 99-108.

Quartile : Q1, Sujet : SOIL SCIENCE

Abstract : The short-term belowground transfer of nitrogen from nitrogen-fixing trees to companion trees has never been studied in the field. A 15N pulse-labeling study was conducted in a mixed plantation of Acacia mangium and Eucalyptus grandis at the peak of leaf area, 26 months after planting. 15N–NO3− was injected into the stem of one big Acacia tree in three plots. 15N was traced over 2 months in the labeled Acacia tree as well as in neighboring Eucalyptus trees. For both species, young leaves were sampled, as well as fine roots and the rhizosphere at a distance of 0.75 m and 2.25 m from the labeled tree. The 15N atom% was also determined in the wood, bark, branches and total foliage of the 3 labeled Acacia trees and 9 Eucalyptus trees, 60 days after labeling. Most of the leaves, fine roots and rhizosphere samples of both species were 15N enriched from 5 days after labeling. The δ15N values were higher at a distance of 0.75 m than at 2.25 m in Acacia roots, but were similar at both distances in Eucalyptus roots and the rhizospheres. The wood and bark of Eucalyptus trees sampled at a distance of 6.2 m from the labeled Acacia trees were 15N enriched. This shows belowground N transfer from Acacia to Eucalyptus trees in the field during the first few days after labeling. This facilitation process may provide a significant amount of the nitrogen requirements of trees close to N-fixing trees in mixed forests. (Résumé d'auteur)

Mots-clés Agrovoc : forêt mélangée, Plantation forestière, Acacia mangium, Eucalyptus grandis, Arbre fixateur d'azote, Injection d'arbres, Fixation de l'azote, Rhizosphère, Mycorhization, Espacement, Racine, Analyse de tissu foliaire, Bois, Écorce

Mots-clés géographiques Agrovoc : Brésil

Classification Agris : K10 - Forestry production
F61 - Plant physiology - Nutrition
P34 - Soil biology

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

• Ribeiro Paula Ranieri, Universidade de São Paulo (BRA)
• Bouillet Jean-Pierre, CIRAD-PERSYST-UMR Eco&Sols (BRA)
• Trivelin P.C.O., Universidade de São Paulo (BRA)
• Zeller Bernd, INRA (FRA)
• De Moraes Gonçalves Jose Leonardo, Universidade de São Paulo (BRA)
• Nouvellon Yann, CIRAD-PERSYST-UMR Eco&Sols (BRA)
• Bouvet Jean-Marc, CIRAD-BIOS-UMR AGAP (FRA)
• Plassard Claude, INRA (FRA)
• Laclau Jean-Paul, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0002-2506-214X

Source : Cirad-Agritrop (https://agritrop.cirad.fr/577729/)

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