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Do diversity of plants, soil fungi and bacteria influence aggregate stability on ultramafic Ferralsols? A metagenomic approach in a tropical hotspot of biodiversity

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Abstract

Aims

Understanding how soil aggregate stability (MWD) is influenced by microbial diversity and abundance can be crucial for ecological restoration in severely disturbed areas. We investigated the relationships between plant and soil microbial diversity and MWD of an ultramafic Ferralsol along a vegetational succession gradient in New Caledonia, where wildfires and extensive nickel mining have degraded the landscape.

Methods

Five plant communities were studied. For each one, MWD, soil physicochemical parameters (e.g. soil organic carbon (SOC)), plant root traits and fungal abundance were measured. The diversity and structure of plant and microbial communities were respectively assessed via botanical inventories and a metagenomic approach. A generalized linear model (GLM) was used to assess the influence of diversity indexes on MWD. Constrained ordinations (CCA) were performed to assess the influence of communities’ structures on MWD.

Results

GLM highlighted the linkage between SOC and MWD but did not identify any significant influence of diversity indexes on MWD. CCA revealed a significant influence of communities’ structures, especially the abundance of saprotrophic fungi, on MWD.

Conclusions

We showed that the structure, but not species richness and diversity of plants, soil fungi and bacteria influence aggregate stability on Ferralsols.

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Acknowledgements

We gratefully acknowledge the field staff of IAC: A. Bouarat, R. Guiglion, J.P. Lataï and A. Pain for their substantial assistance. We are thankful to our colleagues at IAC: K. Letellier, S. Gigante, V. Gourmelon, J. Soewarto and M. Lelièvre. We are thankful to our colleagues at Cirad, L. Maggia, who supervised with F. Carriconde, V. Gourmelon’s PhD, and E. Gozé who gave statistical advice. We are grateful to our internal reviewer, Mélissande Nagati (UQAT), for helpful advice and comments on a previous version of the manuscript, as well as the anonymous reviewers. Fieldwork and laboratory analyses were funded by INRA, IAC and through a collaboration agreement between IAC and Société Le Nickel (agreement IAC-SLN n°DE2013-041); this funding was granted to F. Carriconde. We thank the French Ministry of Agriculture for funding a PhD bursary (J. Demenois). Luis Merino-Martín was funded with a Marie Curie IEF fellowship (ref. 626666/2013) from the FP7 European program.

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Authors and Affiliations

  1. UPR AIDA, CIRAD (Centre de Coopération Internationale en Recherche Agronomique pour le Développement), 34398, Montpellier, France

    Julien Demenois

  2. AIDA, University of Montpellier, Cirad, Montpellier, France

    Julien Demenois

  3. Amap, INRAE, Cirad, Cnrs, Ird, University of Montpellier, Montpellier, France

    Luis Merino-Martín & Alexia Stokes

  4. CEFE, CNRS, Univ Montpellier, Univ Paul Valéry Montpellier 3, EPHE, IRD, Montpellier, France

    Luis Merino-Martín

  5. Equipe Sol & Végétation (SolVeg), Institut Agronomique néo-Calédonien (IAC), BP18239, 98848, Nouméa, New Caledonia, France

    Nicolas Fernandez Nuñez & Fabian Carriconde

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Sup. Fig. 1. Best generalized linear model for predicting soil aggregate stability along the successional gradient without (A) or with (B) variables of diversity. Coloured dots correspond to each plot. Plant communities are indicated by different colours: red is sedge-dominated community (S); yellow is shrubland with Tristaniopsis glauca (Mq); orange is Arillastrum forest (Ag); green is Nothofagus forest (Na) and blue is mixed rainforest (M). (PNG 483 kb)

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Demenois, J., Merino-Martín, L., Fernandez Nuñez, N. et al. Do diversity of plants, soil fungi and bacteria influence aggregate stability on ultramafic Ferralsols? A metagenomic approach in a tropical hotspot of biodiversity. Plant Soil 448, 213–229 (2020). https://doi.org/10.1007/s11104-019-04364-8

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