Potential of bioassays to assess consequences of cultivation of Acacia mangium trees on nitrogen bioavailability to Eucalyptus trees: Two case-studies in contrasting tropical soils

Waithaisong Kittima, Robin Agnès, Mareschal Louis, Bouillet Jean-Pierre, Harmand Jean-Michel, Bordron Bruno, Laclau Jean-Paul, Moraes Gonçalves José Leonardo, Plassard Claude. 2023. Potential of bioassays to assess consequences of cultivation of Acacia mangium trees on nitrogen bioavailability to Eucalyptus trees: Two case-studies in contrasting tropical soils. Plants, 12 (4), n.spéc. Plant Nutrition Volume II:802, 13 p.

Résumé : We hypothesized that the nitrogen-fixing tree Acacia mangium could improve the growth and nitrogen nutrition of non-fixing tree species such as Eucalyptus. We measured the N-mineralization and respiration rates of soils sampled from plots covered with Acacia, Eucalyptus or native vegetation at two tropical sites (Itatinga in Brazil and Kissoko in the Congo) in the laboratory. We used a bioassay to assess N bioavailability to eucalypt seedlings grown with and without chemical fertilization for at least 6 months. At each site, Eucalyptus seedling growth and N bioavailability followed the same trends as the N-mineralization rates in soil samples. However, despite lower soil N-mineralization rates under Acacia in the Congo than in Brazil, Eucalyptus seedling growth and N bioavailability were much greater in the Congo, indicating that bioassays in pots are more accurate than N-mineralization rates when predicting the growth of eucalypt seedlings. Hence, in the Congo, planting Acacia mangium could be an attractive option to maintain the growth and N bioavailability of the non-fixing species Eucalyptus while decreasing chemical fertilization. Plant bioassays could help determine if the introduction of N2-fixing trees will improve the growth and mineral nutrition of non-fixing tree species in tropical planted forests.

Mots-clés Agrovoc : Acacia mangium, Eucalyptus, biodisponibilité, plantation forestière, fertilisation, fertilité du sol, sol tropical, nutrition des plantes, croissance, Eucalyptus grandis, Fixation de l'azote, introduction de plantes, Arénosol

Mots-clés géographiques Agrovoc : Brésil, Congo

Mots-clés libres : Soil N-mineralization rate, Soil respiration rate, N2-fixing tree species, Plant N accumulation

Classification Agris : F61 - Physiologie végétale - Nutrition
F62 - Physiologie végétale - Croissance et développement

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement hors UE : Agence Nationale de la Recherche

Projets sur financement : (FRA) Intensification écologique des écosystèmes de plantations forestières. Modélisation biophysique et évaluation socio-économique de l'association d'espèces fixatrices d'azote

Auteurs et affiliations

• Waithaisong Kittima, INRAE (FRA)
• Robin Agnès, CIRAD-PERSYST-UMR Eco&Sols (FRA)
• Mareschal Louis, CIRAD-PERSYST-UMR Eco&Sols (FRA)
• Bouillet Jean-Pierre, CIRAD-PERSYST-UMR Eco&Sols (MDG)
• Harmand Jean-Michel, CIRAD-PERSYST-UMR Eco&Sols (CMR) ORCID: 0000-0002-8065-106X
• Bordron Bruno, CIRAD-PERSYST-UMR Eco&Sols (MDG)
• Laclau Jean-Paul, CIRAD-DG-Direction générale (FRA) ORCID: 0000-0002-2506-214X
• Moraes Gonçalves José Leonardo, ESALQ (BRA)
• Plassard Claude, INRAE (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/604069/)

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