Mixed Eucalyptus plantations induce changes in microbial communities and increase biological funtions in the soil and litter layers

Pereira Arthur P.A., Durrer Ademir, Gumiere Thiago, Gonçalves José Leonardo M., Robin Agnès, Bouillet Jean-Pierre, Wang Juntao, Verma Jay P., Singh Brajesh K., Cardoso Elke J.B.N.. 2019. Mixed Eucalyptus plantations induce changes in microbial communities and increase biological funtions in the soil and litter layers. Forest Ecology and Management, 433 : 332-342.

Quartile : Q1, Sujet : FORESTRY

Résumé : Mixed plantations of Eucalyptus and N2-fixing trees are ecologically beneficial because they stimulate organic matter cycling and increase carbon (C) and nitrogen (N) pools in the soil. However, the microbial mechanisms that contribute to the improvement of C and N dynamics remain poorly understood in managed forest ecosystems. Here, we evaluated interactions between the bacterial community and biological functions involved in C and N cycles in the soil and litter layers resulting from pure or mixed Eucalyptus grandis and Acacia mangium plantations. We hypothesized that the mixed plantations induce changes in the bacterial community that would drive increases in C and N pools in soil and litter layers. We established a field experiment with treatments including pure E. grandis without (E) and with nitrogen fertilization (E + N), pure A. mangium (A), and mixed E. grandis and A. mangium (E + A). Soil and litter from all treatments were sampled 27 and 39 months after planting. We evaluated the soil and litter bacterial community and biological functions involved in C and N cycles (i.e., microbial and enzyme activities, functional gene abundance, and soil-litter nutrient cycling). The treatments A and E + A showed an increase in C and N contents in the organic soil fractions. We found higher bacterial diversity and OTU richness in soil and litter, and higher nifH gene abundance in the soil under A and E + A, when compared to pure E. grandis (especially E + N) plantation. Our data suggest that the total N content influences the bacterial community structure of the litter, which undergoes alterations according to the treatment and forest age. Equally, Rhizobium, Bradyrhizobium and Sphingomonas showed a positive correlation with nifH and soil N. Our study provided evidence that changes in the microbial community in mixed A. mangium and E. grandis plantations is correlated with increased C and N cycling. These findings have implications for increased productivity and environmental sustainability, besides allowing for the optimization of mineral fertilization in forest plantations.

Mots-clés Agrovoc : plantation forestière, Eucalyptus, culture en mélange, cycle du carbone, cycle de l'azote, transport des substances nutritives, biologie du sol, rhizosphère

Mots-clés libres : Forest ecosystems, Mixed forests, Nutrient cycling, Microbial diversity and ecology, Eucalyptus sustainability

Classification Agris : K10 - Production forestière
F61 - Physiologie végétale - Nutrition
P34 - Biologie du sol
P33 - Chimie et physique du sol

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

Auteurs et affiliations

• Pereira Arthur P.A., USP (BRA) - auteur correspondant
• Durrer Ademir, ESALQ (BRA)
• Gumiere Thiago, Institut National de la Recherche Scientifique (CAN)
• Gonçalves José Leonardo M., USP (BRA)
• Robin Agnès, CIRAD-PERSYST-UMR Eco&Sols (BRA)
• Bouillet Jean-Pierre, CIRAD-PERSYST-UMR Eco&Sols (MDG)
• Wang Juntao, Hawkesbury Institute for the Environment (AUS)
• Verma Jay P., Hawkesbury Institute for the Environment (AUS)
• Singh Brajesh K., Hawkesbury Institute for the Environment (AUS)
• Cardoso Elke J.B.N., USP (BRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/589767/)

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