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Sid Ahmed Aouadj

  • Biodiversity Journal, 12 (3): 0755-0760

    Rachid Dahmani, Abdessamed Merzouk & Sid Ahmed Aouadj
    Incidences of anthropogenic pressure on the degradation of the scrub of the western Algerian region (Tlemcen, case of Djebel Felloucene): qualitative and quantitative aspects
    https://doi.org/10.31396/Biodiv.Jour.2021.12.3.755.760

    ABSTRACT
    The scrub of Djebel de Fellaoucene is one of the forests of the mounts of the Traras (western of Algeria) that undergoes enormous variations which vary according to the regressive or progressive dynamics under climatic and anthropogenic pressures in semi-arid zones. These landscapes are in fact a mosaic in which several types of matorrals such as scrubland or scrub overlap, determined by multiple factors: the local climate (drought, climatic aridity, etc.), the importance of human activities; overgrazing is also a major limiting factor. This current study provides a qualitative and quantitative assessment of the anthropogenic pressure exerted in this area. The methodology adopted in this study is that of Le Houerou (1969) and Montoya (1983), which is based on the calculation of the annual needs of the herd in forage units, the estimation of the food production potential, the overgrazing coefficient and in addition the anthropogenic pressure index. The result of the forage balance in the forest rangelands of the study area has a forage deficit (overload) of -7,962,360 UF (a sylvo-pastoral imbalance), the overgrazing coefficient is (91%) and the anthropogenic pressure index is very high (26). The quantification of the impact of anthropogenic action and overgrazing on the forest formations effects makes it possible to establish a trajectory of the cumulative anthropogenic impacts on this area in order to develop restoration strategies and more effective means of protection.

  • Biodiversity Journal, 12 (2): 0475-0482

    Farah Bessaid, Okkacha Hasnaoui, Brahim Babali, Sid Ahmed Aouadj
    Post-fire regeneration of cork Oak and holm Oak at Tlemcen National Park (Western Algeria)
    https://doi.org/10.31396/Biodiv.Jour.2021.12.2.475.482

    ABSTRACT
    The most worrying factor in forest degradation is fire, whose outbreak and spread is favored by physical and natural conditions. Algeria, like other Mediterranean countries, is paying a high cost. It must be recognized that forest fires have become disastrous in the last decades. An average of 30,000 hectares is destroyed every year, threatening the country’s ecological balance. This study aims to identify the post-fire dynamics of forest structuring species in Tlemcen National Park (Western Algeria). This article is written in this context. This work is based on observations as well as a monitoring of burned sites. The aim is to show concretely the resilience of cork Oak (Quercus suber L.) and holm Oak (Q. ilex L.), the flagship species of Tlemcen National Park, in order to develop a conservation strategy and identify a succession model after a fire. An experimental protocol has been put in place to assess vegetation regeneration. Post-fire morphometric measurements were performed three years in a row (T1, T2 and T3) during the adequate phenological period. The observed elongations range from 22.6 cm to 17.9 cm in the first year; 46.16 cm to 36.5 cm in the second year and 95.2 cm to 67.3 cm in the third year in favour of holm Oak. Monthly and inter-year comparative analyses reveal that, under the same site conditions, holm Oak shows a better adaptability to fires than cork Oak. The various measures recorded show an elongation of 20.95% in favour of holm Oak in the first year, 20.92% in the second year and 29.30% in the third year in favour of the holm Oak. A competition for the recapture of the burnt space takes place after the fires. As for the other species, there is a self-succession where chamephytic species are the most favoured.

  • Biodiversity Journal, 12 (1): 0139-0145

    Sarra Ghalem, Faiçal Hassani, Sid Ahmed Aouadj & Ibtissam Sarah Bouayed
    Biological, morphological and phytobiogeographic diversity of Malva subovata (DC.) Molero & J.M. Monts. (Malvales Malvaceae) in the Tlemcen region, Algeria
    https://doi.org/10.31396/Biodiv.Jour.2021.12.1.139.145

    ABSTRACT
    The vegetation of the region of western Algeria presents a good example of the study of phyto-diversity. The method of floristic analysis is a main element in the knowledge of natural environments and its rich flora. In my two stations, we carried out floristic surveys, these are a set of observations on the environment and on the vegetation. The study presented is only a part of the objectives of the Laboratory of Plant Ecology focused on the floristic diversity of Malva subovata (DC.) Molero & J.M.Monts. (Malvales Malvaceae) on the mastery of the biological, morphological and phytobiogeographic capital of the two stations “Boussdra and Hammam Boughrara” in the Tlemcen region. From the treatment of biodiversity indices and the floristic surveys, we were able to conclude that the study area is undergoing a regressive dynamic of vegetation.

  • Biodiversity Journal, 11 (1): 025-034

    Sid Ahmed Aouadj, Yahia Nasrallah & Okkacha Hasnaoui
    Regional phytogeographic analysis of the flora of the Mounts of Saida (western Algeria): evaluation-restoration report
    https://doi.org/10.31396/Biodiv.Jour.2020.11.1.25.34

    ABSTRACT
    A regional floristic and phytogeographic study was conducted in the Mounts of Saida, a sub-sector of the Tell Atlas (Oran) (O3), in the western Algeria. On an area of 56.31 Km2 surveyed regularly over time during the springs and autumns from 2017 to 2019. A total of 344 taxa divided into 77 families and 223 genera, including 18 new (exogenous) for Tell Atlas (Oran) sub-sector (O3), have been inventoried. Of these 18 species, 8 belong to the phytogeographic areas of the arid (H) and hyperarid (AS) regions and 2 invasive species that reinforce and confirm theories of plant dispersal to the north and to high altitudes for adapting to climate change. The Factor Analysis of Correspondences (F.A.C) shows that species distribution is the result of local microclimates associated with the elevation; particularly, the mountains facing north receive a significant amount of humidity from the Mediterranean Sea.