Abstract
The degradation of the natural resources in Algeria nowadays remains a major constraint for the agrosilvopastoral development. Indeed, the area of Beni Saf is confronted with many problems such as the anthropozoic pressure which does not make it possible to keep balance between the exploitation of the natural resources and their regenerations in time and space. Following the example results obtained through a floristic study by the factorial analysis of correspondences (F A C), concerning the identification of anthropozoogenes species such as: Chamaerops humilis, Asphodelus microcarpus, Withania frutescens, Calycotome spinosa, Asparagus albus; furthermore, the calculation of the disturbance index which marks the rate of therophytisation which is about 68%, that one finds it very high. These indices show a disturbance and an imbalance of the plant formation of the zone of study, caused by the high anthropozoogene pressure. Vis-a-vis this threat, it is essential to propose a possibility of intervention for a durable management of these spaces.
Highlights
In the Mediterranean region, the multiple paleogeographic events and the contrasted climatic cycles allowed the emergence of this unusually high biodiversity [1]
Loisel et al [30] established a formula called index of disturbance, which quantifies the therophytisation of the natural environments
The correspondence analysis, realized on the species inventoried in the area of Beni Saf, makes it possible to highlight the ecological gradients and to confirm that the bioclimatic and anthropozoic factors explain the great part of the information brought by the various axes
Summary
In the Mediterranean region, the multiple paleogeographic events and the contrasted climatic cycles allowed the emergence of this unusually high biodiversity [1]. In the South and the East of the Mediterranean, the ecosystems are always intensively used by the man. Because of the considerable population growth, there has been acceleration during the three last decades of the use of the natural resources which often exceeds their capacities of renewal [2]. The north of Algeria is subject to strong pressures of men and cattle that generated a severe impoverishment of the soil and vegetable cover [3]. The anthropozoïc factors play a major role in the organization of the vegetation structures. The population growth rate, especially rural, determined a radical transformation of the use of the environment. Deforestation, dematorralisation, anarchic cuts, uncontrolled cultures’ settings and excessive overgrazing, deeply disturbed ecological balances which existed twenty years ago [4]
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