Author(s): Lambais, George Rodrigues ; Jourdan, Christophe ; de Cássia Piccolo, Marisa ; Germon, Amandine [UNESP] ; Pinheiro, Rafael Costa [UNESP] ; Nouvellon, Yann ; Stape, José Luiz ; Campoe, Otávio Camargo ; Robin, Agnès ; Bouillet, Jean-Pierre ; le Maire, Guerric ; Laclau, Jean-Paul [UNESP]
Date: 2018
Persistent ID: http://hdl.handle.net/11449/170294
Origin: Oasisbr
Subject(s): Fine root dynamics; Lifespan; Minirhizotron; Oxisol; Plantation; Turnover
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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.
Center for Nuclear Energy in Agriculture University of São Paulo, Piracicaba
CIRAD UMR Eco&Sols
Eco&Sols Univ Montpellier CIRAD INRA IRD, Montpellier SupAgro
School of Agricultural Sciences São Paulo State University (UNESP), Botucatu
Suzano Papel e Celulose Brasil, Itapetininga
Department of Agriculture Biodiversity and Forest Federal University of Santa Catarina
ESALQ Universidade de São Paulo
School of Agricultural Sciences São Paulo State University (UNESP), Botucatu
FAPESP: 2011/06412-3
