Charcoal mineralisation potential of microbial inocula from burned and unburned forest soil with and without substrate addition
2010
Nocentini, Caterina | Guenet, Bertrand | Di Mattia, Elena | Certini, Giacomo | Bardoux, Gerard | Rumpel, Cornelia | Università degli Studi di Firenze = University of Florence = Université de Florence (UniFI) | Biogéochimie et écologie des milieux continentaux (Bioemco) ; École normale supérieure - Paris (ENS-PSL) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS) | DABAC Dipartimento di Agrobiologia e Agrochimica ; Università degli studi della Tuscia [Viterbo]
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Mostrar más [+] Menos [-]Inglés. Effects of fire on the functioning of the soil microbial community are largely unknown. In this study, we addressed the charcoal mineralisation potential of microbial inocula extracted from burned and unburned soil. The mineralisation of charcoal was analysed during a 1 month incubation experiment under controlled conditions with and without substrate addition. The aim of the study was to elucidate (1) the indirect effect of fire on the functioning of the soil microbial community in terms of charcoal degradation and (2) the possibility to stimulate this degradation by addition of two substrates of increasing complexity. Our conceptual approach included the monitoring of CO$_2$ emission from microcosms containing laboratory-made charcoal and microbial inocula from burned and unburned soil with and without $^{13}$C labelled glucose and cellulose. Our results showed higher charcoal mineralisation without substrate addition in microcosms with the inocula from unburned soil compared to burned soil. Charcoal mineralisation was stimulated by the addition of glucose, whereas cellulose addition did not induce a priming effect. We observed a higher stimulation of charcoal mineralisation induced by glucose for the inoculum from burned soil compared to the inoculum from unburned soil. We concluded that fire did affect the functioning of the soil microbial community in terms of charcoal degradation and that the important priming effect induced by glucose may be explained by an increase of the overall microbial activity, rather than selective stimulation of charcoal degrading microbial communities.
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