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Nutrient supply modulates species interactions below ground: dynamics and traits of fine roots in mixed plantations of Eucalyptus and Acacia mangium

Bordron Bruno, Germon Amandine, Laclau Jean-Paul, Oliveira I.R., Robin Agnès, Jourdan Christophe, Paula Ranieri Ribeiro, Pinheiro R.C., Guillemot Joannès, Gonçalves José Leonardo M., Bouillet Jean-Pierre. 2021. Nutrient supply modulates species interactions below ground: dynamics and traits of fine roots in mixed plantations of Eucalyptus and Acacia mangium. Plant and Soil, 460 : pp. 559-577.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Abstract : Aims: Belowground interactions are still poorly understood in mixed-species forests. We investigated the effects of soil fertility on belowground processes in mixed planted forests. Methods: The dynamics and traits of Eucalyptus and Acacia mangium fine roots (diameter < 2 mm) in plantations with 50% of each species were studied in a randomized block design established in a nutrient depleted soil. Stands with NPK fertilization applied at planting (F+) were compared to unfertilized stands (F-). Results: In the 0–15 cm soil layer, Eucalyptus root mass density (RMD) was higher than Acacia RMD by 50% in F+ and 10% in F-, considering both ages. At 34 months of age, Eucalyptus RMD was 94% higher near Acacia trees than near Eucalyptus trees in F-. In this layer, Eucalyptus specific root length (SRL) was 21% higher than Acacia SRL at 16 months of age and was 10% higher in F- than in F+ at 34 months of age. The cumulative Eucalyptus fine root length production between 16 and 34 months was 66% higher in F- than in F+ in the 0–1 m soil layer. Conclusions: Fertilization increased the competition between species and led to a partial exclusion of Acacia fine roots from the nutrient-rich topsoil. Soil exploration by Eucalyptus roots in the vicinity of Acacia trees was higher in F- than in F+, which suggests that unfertilized trees benefited from facilitation through higher soil N availability and direct N transfer from Acacia trees.

Mots-clés Agrovoc : Fertilité du sol, Culture en mélange, Eucalyptus, Acacia mangium, Culture associée, forêt tropicale, Sol de forêt, Relation plante sol, Interactions biologiques, Taille des racines, Système racinaire

Mots-clés géographiques Agrovoc : Brésil

Mots-clés libres : Mixed-species plantations, Ferralsol soil, Fertilization, Facilitation, Competition, Brazil

Classification Agris : P35 - Soil fertility
F04 - Fertilizing
F61 - Plant physiology - Nutrition
P34 - Soil biology

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

Auteurs et affiliations

  • Bordron Bruno, CIRAD-PERSYST-UMR Eco&Sols (FRA) - auteur correspondant
  • Germon Amandine, UNESP (BRA)
  • Laclau Jean-Paul, CIRAD-DG-Direction générale (FRA) ORCID: 0000-0002-2506-214X
  • Oliveira I.R., ESALQ (BRA)
  • Robin Agnès, CIRAD-PERSYST-UMR Eco&Sols (FRA)
  • Jourdan Christophe, CIRAD-PERSYST-UMR Eco&Sols (FRA)
  • Paula Ranieri Ribeiro, UFES (BRA)
  • Pinheiro R.C., UNESP (BRA)
  • Guillemot Joannès, CIRAD-PERSYST-UMR Eco&Sols (BRA) ORCID: 0000-0003-4385-7656
  • Gonçalves José Leonardo M., ESALQ (BRA)
  • Bouillet Jean-Pierre, CIRAD-PERSYST-UMR Eco&Sols (MDG)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/597940/)

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