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Biomass production, nitrogen accumulation and symbiotic nitrogen fixation in a mixed-species plantation of eucalypt and acacia on a nutrient-poor tropical soil

Tchichelle Sogni Viviane, Mareschal Louis, Koutika Lydie-Stella, Epron Daniel. 2017. Biomass production, nitrogen accumulation and symbiotic nitrogen fixation in a mixed-species plantation of eucalypt and acacia on a nutrient-poor tropical soil. Forest Ecology and Management, 403 : pp. 103-111.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : FORESTRY

Abstract : The success of mixed-species tree plantations depends on the balance between positive and negative interactions. Mixtures of Acacia mangium and Eucalyptus urophylla × grandis out-yield their respective monocultures in term of wood production on the Congolese coastal plain, suggesting that facilitation and/or competitive reduction surpass interspecific competition. We investigated how these interactions affected biomass production and N accumulation during the early growth stage of a second rotation of a mixed-species stand of these two species. We used the 15N dilution method to estimate symbiotic nitrogen fixation and its contribution to N accumulation in acacia monoculture and mixture, and we assessed how much N derived from the atmosphere is transferred to the eucalypt trees in the mixed-species stand. Eucalypts grew taller and acacias grew larger in the mixture compared to the monocultures. N mineralomass was greater in the mixture relative to the average values in the two monocultures, with both species contributing to this enhanced N mineralomass. The amount of N derived from the atmosphere in the mixture was 60% higher than that expected given the amount found in acacia monoculture, and 16% of the nitrogen accumulated in eucalypt trees and aboveground eucalypt litterfall was derived from the atmosphere. Reduced competition for light and soil water also contributed to the increased growth of acacias in the mixture, showing that both species benefit from growing in a mixed stand. (Résumé d'auteur)

Mots-clés Agrovoc : Eucalyptus urophylla, Eucalyptus grandis, Acacia mangium, Essai de provenances, Production du bois, Plantation forestière, Monoculture, Culture associée, Biomasse, Fixation de l'azote, Symbiose

Mots-clés géographiques Agrovoc : République démocratique du Congo, Papouasie-Nouvelle-Guinée, Australie

Mots-clés complémentaires : Plantation forestière mixte

Classification Agris : K10 - Forestry production
F61 - Plant physiology - Nutrition
P33 - Soil chemistry and physics
P34 - Soil biology

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

Auteurs et affiliations

  • Tchichelle Sogni Viviane, CRDPI (COG)
  • Mareschal Louis, CIRAD-PERSYST-UMR Eco&Sols (FRA)
  • Koutika Lydie-Stella, CRDPI (COG)
  • Epron Daniel, CIRAD-PERSYST-UMR Eco&Sols (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/585504/)

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