Asia Life Sciences

Abstract : In order to know the diversity and the properties of the soils of the Edough massif (Seraidi) North East of Algeria, we established a plan of prospection and sampling on the basis of a topographic background with superposition of the various plant groups. This study consists in a stratified sampling plan of vegetation, and to inventory the different strata of vegetation, and to describe the soil on which this plant formation develops, because the soil constitutes the living medium and the basis of the ecology and the functioning of the ecosystems. The results obtained show a great richness and diversity of the soils of the Seraidi forest; whose soils are acidic, and the adsorbent complex is desaturated acid, with a rate of organic matter that varies with the contribution of litter, and a significant porosity in all soils of this forest. It appears that there is a close correlation between the vegetation and the soil, as long as the latter is the living environment and the support of the vegetation. This last one plays a determining role in the morphological differentiation, the individualization of the soils, and the orientation of the pedogenetic processes on the surface, whereas the mother rock controls these processes in depth. Therefore, it is necessary to protect this natural diversity to ensure sustainable development.

Abstract : In order to have an overview of the state of P. oceanica on the north-eastern Algerian coast, a monitoring of seasonal phenological parameters was carried out in the Gulf of Annaba in six stations at different depths (Cap de garde, Ain Achir, La caroube, Lever de l'aurore, Draouche, and Cap rosa), during the four seasons of the year 2021. The phenological study of P.oceanica shows that the number of leaves at the level of the clusters differs according to the stations and the seasons, we have highlighted a seasonal variation of the Posidonia meadow of this region. The results indicate that the leaf area calculated from the length and width of the leaves (intermediate and adult) depends significantly on the study season and the stations studied. For juvenile leaves, the study indicates that the phenological parameters of juvenile leaves are similar for the six stations and during the four seasons of study. The meadow of the Gulf of Annaba shows signs of disturbance, considering its weak vitality, especially in the stations Lever de l'aurore, Ain achir and La caroube. A considerable effort must be provided, in order to preserve the meadows with P.oceanica of the various localities of the Algerian littoral.