Temporal recovery of soil biological activity and diversity after 915-MHz microwave treatments

Maynaud Géraldine, Baudoin Ezékiel, Mahé Frédéric, Villenave Cécile, Cleyet-Marel Jean-Claude, Brunel Béatrice. 2021. Temporal recovery of soil biological activity and diversity after 915-MHz microwave treatments. Biology and Fertility of Soils, 57 (5) : 603-616.

Quartile : Q1, Sujet : SOIL SCIENCE

Résumé : Two 915-MHz microwave treatments (2 kW-8 min and 4 kW-4 min) were applied to soil and their effects were monitored just after treatments (T0) and 26 days (T26) in soil microcosms. Densities of culturable bacteria, fluorescent pseudomonads and nematodes, hydrolysis activity and soil DNA content declined by over 50% immediately after both microwave treatments (T0), excluding the total fungal 18S rRNA (−13 or −17%) and bacterial 16S rRNA copies (non-significant). A rapid shift in bacterial community composition occurred from T0 towards a large increase in the relative abundance of Firmicutes (+1650%) and a concomitant decrease in various phyla (e.g. Acidobacteria, Actinobacteria, Bacteroidetes, Proteobacteria) from −85 to −61%. At T26 and for both treatments, fluorescein diacetate hydrolysis, density of culturable bacteria, 18S rRNA gene numbers, Simpson diversity, relative abundances of Bacteroidetes and Proteobacteria regained levels similar to controls. Alpha, Delta and Gamma classes Proteobacteria also end up reaching a similar level. In contrast, fluorescent pseudomonad density, nematode diversity and abundance, soil DNA content and relative abundances of some phylum (Acidobacteria, Actinobacteria, Chloroflexi) did not increase in such proportions. Most of the soil biological properties have not been permanently impacted. Nevertheless, the recovery kinetics highly differed according properties, with resilience indices at T26 varying from −87 to +99%.

Mots-clés Agrovoc : biologie du sol, biodiversité, Bacteria, propriété biologique, traitement aux micro-ondes, fluorescence, hydrolyse, activité biologique dans le sol, adn, densité

Mots-clés géographiques Agrovoc : France

Mots-clés libres : Soil heating, Microbial indicators, Bacteria, Nematode, Disturbance, Resilience

Agences de financement hors UE : Bpifrance, Conseil Régional Provence-Alpes-Côte d'Azur, Région Occitanie Pyrénées-Méditerranée, Conseil Général de l'Ain

Auteurs et affiliations

• Maynaud Géraldine, Université de Montpellier (FRA)
• Baudoin Ezékiel, IRD (FRA)
• Mahé Frédéric, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0002-2808-0984
• Villenave Cécile, IRD (FRA)
• Cleyet-Marel Jean-Claude, INRAE (FRA)
• Brunel Béatrice, INRAE (FRA) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/603414/)

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