Anthropic disturbances impact the soil microbial network structure and stability to a greater extent than natural disturbances in an arid ecosystem

Maurice Kenji, Bourceret Améliia, Youssef Sami, Boivin Stéphane, Laurent-Webb Liam, Damasio Coraline, Boukcim Hassan, Selosse Marc-André, Ducousso Marc. 2023. Anthropic disturbances impact the soil microbial network structure and stability to a greater extent than natural disturbances in an arid ecosystem. Science of the Total Environment, 907:167969, 11 p.

https://doi.org/10.1016/j.scitotenv.2023.167969

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

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Résumé : Growing pressure from climate change and agricultural land use is destabilizing soil microbial community interactions. Yet little is known about microbial community resistance and adaptation to disturbances over time. This hampers our ability to determine the recovery latency of microbial interactions after disturbances, with fundamental implications for ecosystem functioning and conservation measures. Here we examined the response of bacterial and fungal community networks in the rhizosphere of Haloxylon salicornicum (Moq.) Bunge ex Boiss. over the course of soil disturbances resulting from a history of different hydric constraints involving flooding-drought successions. An anthropic disturbance related to past agricultural use, with frequent successions of flooding and drought, was compared to a natural disturbance, i.e., an evaporation basin, with yearly flooding-drought successions. The anthropic disturbance resulted in a specific microbial network topology characterized by lower modularity and stability, reflecting the legacy of past agricultural use on soil microbiome. In contrast, the natural disturbance resulted in a network topology and stability close to those of natural environments despite the lower alpha diversity, and a different community composition compared to that of the other sites. These results highlighted the temporality in the response of the microbial community structure to disturbance, where long-term adaptation to flooding-drought successions lead to a higher stability than disturbances occurring over a shorter timescale.

Mots-clés Agrovoc : utilisation des terres, rhizosphère, changement climatique, biodiversité, écosystème, facteur anthropogène

Mots-clés géographiques Agrovoc : Arabie Saoudite

Mots-clés libres : Soil microbiome, Co-occurrence networks, Stability, Disturbance

Classification Agris : P01 - Conservation de la nature et ressources foncières
P34 - Biologie du sol

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Agences de financement hors UE : Agence Française de Développement d'AlUla, Royal Commission of AlUla

Projets sur financement : (FRA) SoFunLand

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