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) : 301-318.

https://doi.org/10.1007/s11104-017-3460-1

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

Version publiée - Anglais
Accès réservé aux personnels Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
Lambais 2017_PS_Contrasting phenology of Eucalyptus grandis fine roots in upper and very deep soil layers in Brazil.pdf
Télécharger (2MB) | Demander une copie

Quartile : Q1, Sujet : AGRONOMY / Quartile : Q1, Sujet : PLANT SCIENCES / Quartile : Q1, Sujet : SOIL SCIENCE

Résumé : 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.

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