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Contrasting phenology of Eucalyptus grandis fine roots in upper and very deep soil layers in Brazil

Lambais George Rodrigues, Jourdan Christophe, De Cassia Piccolo Marisa, Germon Amandine, Costa Pinheiro Rafael, Nouvellon Yann, Stape Jose Luiz, Camargo Campoe Otávio, Robin Agnès, Bouillet Jean-Pierre, Le Maire Guerric, Laclau Jean-Paul. 2017. Contrasting phenology of Eucalyptus grandis fine roots in upper and very deep soil layers in Brazil. Plant and Soil, 421 (1-2) : pp. 301-318.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : AGRONOMY / Quartile : Q1, Sujet : PLANT SCIENCES / Quartile : Q1, Sujet : SOIL SCIENCE

Abstract : Background and aims: While the role of deep roots in major ecosystem services has been shown for tropical forests, there have been few direct measurements of fine root dynamics at depths of more than 2 m. The factors influencing root phenology remain poorly understood, creating a gap in the knowledge required for predicting the effects of climate change. We set out to gain an insight into the fine root phenology of fast-growing trees in deep tropical soils. Methods: Fine root growth and mortality of Eucalyptus grandis trees were observed fortnightly using minirhizotrons down to a soil depth of 6 m, from 2 to 4 years after planting. Results: In the topsoil, the highest live root length production was during the rainy summer (20 cm m−2 d−1) whereas, below 2 m deep, it was at the end of the dry winter (51 cm m−2 d−1). The maximum root elongation rates increased with soil depth to 3.6 cm d−1 in the 5–6 m soil layer. Conclusions: Our study shows that the effect of the soil depth on the seasonal variations in fine root growth should be taken into account when modelling the carbon, water and nutrient cycles in forests growing on deep tropical soils. (Résumé d'auteur)

Mots-clés Agrovoc : Eucalyptus grandis, Phénologie, Racine, Enracinement, Système racinaire, Croissance, Profondeur, Texture du sol, Transport des substances nutritives, Cycle du carbone, Cycle hydrologique, Plantation forestière

Mots-clés géographiques Agrovoc : Brésil

Mots-clés complémentaires : Oxisol

Mots-clés libres : Plantation, Fine root dynamics, Turnover, Lifespan, Minirhizotron, Oxisol

Classification Agris : F50 - Plant structure
F61 - Plant physiology - Nutrition
F62 - Plant physiology - Growth and development
P33 - Soil chemistry and physics
K10 - Forestry production

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

Auteurs et affiliations

  • Lambais George Rodrigues, CENA (BRA)
  • Jourdan Christophe, CIRAD-PERSYST-UMR Eco&Sols (FRA)
  • De Cassia Piccolo Marisa, CENA (BRA)
  • Germon Amandine, UNESP (BRA)
  • Costa Pinheiro Rafael, UNESP (BRA)
  • Nouvellon Yann, CIRAD-PERSYST-UMR Eco&Sols (THA)
  • Stape Jose Luiz, Universidade de São Paulo (BRA)
  • Camargo Campoe Otávio, UDESC (BRA)
  • Robin Agnès, CIRAD-PERSYST-UMR Eco&Sols (BRA)
  • Bouillet Jean-Pierre, CIRAD-PERSYST-UMR Eco&Sols (MDG)
  • Le Maire Guerric, CIRAD-PERSYST-UMR Eco&Sols (BRA) ORCID: 0000-0002-5227-958X
  • Laclau Jean-Paul, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0002-2506-214X

Source : Cirad-Agritrop (https://agritrop.cirad.fr/586350/)

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