Large variability of soil microbial diversity and functions in an over 20-year old Eucalyptus grandis plantation

Brondani Margot, Robin Agnès, Marchal Julie, Pablo Anne-laure, Personne Aline, Desmarais Eric, Cerqueira Frédérique, Mahe Frédéric, Degrune Florine, Guillemot Joannès, Brancalion Pedro H.S., Fromin Nathalie. 2025. Large variability of soil microbial diversity and functions in an over 20-year old Eucalyptus grandis plantation. Applied Soil Ecology, 209:106008, 9 p.

Url - jeu de données - Dataverse Cirad : https://doi.org/10.18167/DVN1/QN22CM

Résumé : The spatial heterogeneity in soil properties as well as in molecular and catabolic diversities of the soil microbial community were investigated by soil analyses, Illumina MiSeq sequencing and MicroResp™ profiling, respectively, in 51 plots of a 20 year-old eucalyptus plantation in south Brazil. The relationships between these parameters were assessed to test whether small scale variation in soil properties and understory vegetation generated heterogeneity in the soil microbial community. The spatial variability of soil microbial community and functioning was shown to be substantial. A greenness index, used as a proxy of the density of the understory biomass, explained very little of the soil microbial parameters. Variability in soil properties (mainly C availability, pH) partly explained shifts in molecular and catabolic parameters of the soil microbial community. Bacterial (and, to a lower extent, fungal) molecular parameters were the main factors explaining the catabolic capabilities of the soil microbial community. But overall, the sequencing data was of little use in explaining C processes in these soils, underlying the difficulty in predicting the contribution of large tree-plantations to the global C cycle.

Mots-clés Agrovoc : Eucalyptus grandis, séquestration du carbone, Eucalyptus, propriété physicochimique du sol, catabolisme, cycle du carbone, biodiversité, utilisation des terres, changement climatique, facteur édaphique, caractéristiques du sol, biologie du sol, analyse de sol

Mots-clés géographiques Agrovoc : Brésil

Mots-clés libres : Fungal community, Bacterial community, Functional diversity, Catabolic profiles, Understory vegetation strip, Tropical tree plantation

Agences de financement hors UE : Centre Méditerranéen de l'Environnement et de la Biodiversité, Université de Montpellier, Agence Nationale de la Recherche

Projets sur financement : (FRA) Mediterranean Center for Environment and Biodiversity, (FRA) IV-TROP: What biological mechanisms link biodiversity to tropical forest functioning? A tree experiment in Brazil”

Auteurs et affiliations

• Brondani Margot, IRD (FRA)
• Robin Agnès, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0003-3044-2304
• Marchal Julie, IRD (FRA)
• Pablo Anne-laure, IRD (FRA)
• Personne Aline, CIRAD-PERSYST-UMR Eco&Sols (FRA)
• Desmarais Eric, ISEM (FRA)
• Cerqueira Frédérique, ISEM (FRA)
• Mahe Frédéric, CIRAD-BIOS-UMR PHIM (FRA) ORCID: 0000-0002-2808-0984
• Degrune Florine, CIRAD-PERSYST-UMR Eco&Sols (LAO) ORCID: 0000-0002-3409-5859
• Guillemot Joannès, CIRAD-PERSYST-UMR Eco&Sols (FRA) ORCID: 0000-0003-4385-7656
• Brancalion Pedro H.S., USP (BRA)
• Fromin Nathalie, CEFE (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/612568/)

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