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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Post-fire recovery of Algerian soil physico-chemical and microbiological properties (forest of Fenouane, wilaya of Saida)
Auteurs :	Amine Habib Borsali, Auteur ; Kheloufi Benabdeli, Auteur ; Raphael Gros, Auteur
Type de document :	Article
Dans :	Ecologia Mediterranea (38(1) 2012)
Article en page(s) :	59-73
Résumé :	Under the effect of increased fires, Algerian's forest seems to be on the way to a progressive loss of forests with economic value and their replacement by scrublands. In this context, the assessment of quality of burned soils should be a major concern of forest management and more generally in the fight against desertification. The aim of this study was to assess the recovery at short and long-term of physical (particle size, water holding capacity), chemical (carbon, nitrogen and phosphorus contents) and microbiological properties (basal respiration, microbial biomass, enzymatic activities) of burned soils. The soil properties were analysed on 25 soil samples sampled in the Forest of Fenouane (wilaya of Saida, Algeria) along a chonosequence 2, 4, 8, 13 and 20 years after the last fire (i.e. 5 times since fire x 5 sampling plots). Compared to an unburned soil since 20 years, the moisture content as well as urease and FDA hydrolase activities were significantly reduced 2 years after the last fire. A peak of microbial activity, due to a stimulation of microbial growth probably by manure, was measured 8 years after the last fire. These unburned soils since 8 years are also characterized by very low organic carbon contents (0.5%) probably resulting from a strong erosion concomitant to a priming-effect of recalcitrant organic matter. This study showed the vulnerability of semi-arid forest soils to a frequency of fires over one fire every 20 years.

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