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Guenon R., Vennetier M., Dupuy N., Roussos Sevastianos, Pailler A., Gros R. (2013). Trends in recovery of mediterranean soil chemical properties and microbial activities after infrequent and frequent wildfires. Land Degradation and Development, 24 (2), 115-128. ISSN 1085-3278

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Titre
Trends in recovery of mediterranean soil chemical properties and microbial activities after infrequent and frequent wildfires
Année de publication2013
Type de documentArticle référencé dans le Web of Science WOS:000317308500002
AuteursGuenon R., Vennetier M., Dupuy N., Roussos Sevastianos, Pailler A., Gros R.
SourceLand Degradation and Development, 2013, 24 (2), p. 115-128. ISSN 1085-3278
RésuméSince the 1970s, increase in fire frequency has been observed in all European Mediterranean regions. The objectives of this study were (1) to determine the effects of wildfire frequency on the recovery at short- and long-term of soil chemical and microbial properties and (2) to identify the mechanisms underlying the recovery of these sites properties. Soils from 17 plots (Maures mountains range, Var, France) were classified into 5 wildfire regimes (i.e. not burned since at least 57 years ago, infrequently and frequently burned-with time since fire between 4 and 17 years). Soil samples from these plots were analysed for their nutrient content, chemical functions of soil organic matter (SOM) using FT-MIR spectroscopy and microbial mineralising activities. Our results showed that the frequent wildfire regime slowed down the recovery in the short term of SOM spectroscopic properties and nutrient availability. Both low quantity and low quality (i.e. high percentage of aromatic and phenolic organic forms) of soil organic matter were found to be related to soil microbial recovery at 4 years after frequent wildfires. The frequent wildfires improved the recovery in net nitrification and nitrate content, leading to an increase in catabolic evenness and a recovery in microbial C-substrate utilisation profiles between 4 and 17 years. However, frequent wildfires slowed down the recovery of hydrolytic enzyme pool (i.e. FDA hydrolases) and phenol oxidase activity, both involved in soil C cycling. Overall, our observations suggest that 4 fires in 50 years is a threshold beyond which soil quality may be endangered.
Plan de classementBiologie du sol [074] ; Biotechnologies [084] ; Pédologie [068] ; Sciences du milieu [021]
Descr. géo.ZONE MEDITERRANNEENNE
LocalisationFonds IRD [F B010060822]
Identifiant IRDfdi:010060822
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010060822

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