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Natural disturbances, such as forest fires, cause significant changes in the structure and functioning of semi-arid ecosystems. After such disturbances, the impact on the soil ecosystem in its entirety is misunderstood. In this study, two years after the last fire, changes in the physicochemical and biological properties of Aleppo pine forest soils in the semi-arid zone were observed. Among all physical properties analysed, only the soil moisture remained significantly lower in the burnt zone in contrast to control zone. Considering the chemical properties, the only negatively affected parameter is the rate of organic matter. In terms of biological properties, results showed that the fire caused a significant decrease in soil microorganisms by decreasing basal respiration and microbial biomass. Conversely, the metabolic quotient recorded higher values in the fire zone than in the control zone. These results indicate that microbial communities in semi-arid soils, already stressed by climatic hazards, are very sensitive to the passage of even low-intensity fires.

The aim of this endeavor was to make preparations for an ointment from aqueous extract from Hammada scoparia. two formulations with different percentages of Hammada scoparia: 10% and 3% were prepared. The antioxidant activity of lyophilisate was established in vitro and assessed in vivo by observing the process of wound healing. Data revealed that Hammada scoparia formulation showed the most substantial antioxidant potency in vitro and after twelve days of therapy, dramatically accelerated wound healing, as evidenced by a greater wound percentage of areas closure (98%) confirmed by histological analysis, in comparison to the control, Mebo, and pure vaseline groups. In general, these results showed that the 10% Hammada scoparia formulation had a greater capacity for wound healing, which was confirmed by its significant in vitro antioxidant activity. [ABSTRACT FROM AUTHOR]

In arid Mediterranean region, the structure of forest stands is the image of their capabilities durability and resistance demonstrated by the rate of land by persistent vegetation recovery rate by stratum and living space, which are useful for understanding the dynamics of vegetation. These three criteria used to classify the different layers according to their importance in bioclimatic zones, the semi-arid and sub-humid, and the most dominant in Algeria. The arborescent and shrub Stratum plays an important role in the two bioclimatic zones points of view recovery; points of view land soil occupation in semi-arid is the under shrub stratum in which premium and shrub Stratum for the sub-humid. Eight principal forest species that dominate the area, their living space depends on density and regeneration capacity, it varies between 28 and 222 square meter depending on the species inducing bad conduct densities and silvicultural work. For that, to preserve these strata with the species composition and ensure stability, a silvicultural work or plantations are necessary. [ABSTRACT FROM AUTHOR]