8 research outputs found

    Health status of Aleppo pine stands (Pinus halepensis Mill.) in the natural Senalba forest (Djelfa - Algeria)

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    La prĂ©sente Ă©tude consiste en un diagnostic de l’état sanitaire des peuplements naturels de Pin d’Alep (Pinus halepensis Mill.) dans les massifs forestiers de Senalba Chergui et Gharbi situĂ©s dans la zone semi-aride de la rĂ©gion de Djelfa (AlgĂ©rie). L’échantillonnage adoptĂ© est le systĂ©matique stratifiĂ©, ce qui a conduit Ă  installer 80 placettes au niveau des versants nord et sud de chacun des massifs selon deux transects nord/sud et est/ouest. DiffĂ©rents paramĂštres dendromĂ©triques (hauteur et circonfĂ©rence des arbres dĂ©pĂ©ris Ă  1,30 m, Ă©paisseur de l’écorce, Ăąge) et stationnels (exposition, altitude, profondeur du sol, pH, taux de calcaire) sont mesurĂ©s. TraitĂ©es et analysĂ©es, ces donnĂ©es nous ont permis de conclure que le phĂ©nomĂšne de dĂ©pĂ©rissement touche majoritairement les peuplements situĂ©s sur le versant sud pour la forĂȘt de Senalba Chergui et ceux sur-ĂągĂ©s situĂ©s sur le versant nord de la forĂȘt de Senalba Gharbi. Les autres paramĂštres stationnels ou dendromĂ©triques n’ont pas d’effet significatif sur le phĂ©nomĂšne.This study aimed to analyse the health status of the natural Senalba Aleppo pine forest (Pinus halepensis Mill.) located in the semi-arid zone of Djelfa (Algeria). A stratified systematic sampling was adopted and 80 plots were set up along two transects established on south and north-facing slopes. Various dendrometric (tree height; circumference at 1.30 m; bark thickness; age) and site parameters (exposure; altitude; soil depth; calcareous rate; soil pH) were measured. Results showed that the decline process preferentially impacted the trees located on the southern slope of Senalba Chergui forest and old trees located on the northern slope of Senalba Gharbi forest. However, the other parameters have no significant effect on the process of decline

    Relation between site parameters and Aleppo Pine (Pinus halepensis Mill.) dendroecology in Senalba forest area (Djelfa, Algeria)

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    Aleppo Pine (Pinus halepensis Mill.) is a volunteering hardy species, very common in Mediterranean regions. This species has great economical, ecological and social values in Algeria. 120 sample plots were laid out on northern and southern slopes of Senalba forest area (Djelfa) located in a semi-arid region, to investigate the effect of altitude, aspect and soil depth on height, circumference at 1.30 m and annual ring growth. The results shown that aspect and altitude were the determining factors of Aleppo Pine growth. Three classes of fertility were distinguished in relation with dominant tree height and ageÀ partir de transects intĂ©grant les variations d’altitude et d’exposition, 120 placettes de Pin d’Alep (Pinus halepensis Mill.) de 800 mÂČ chacune ont Ă©tĂ© installĂ©es au niveau de quatre stations choisies dans le massif forestier de Senalba (Djelfa, AlgĂ©rie) situĂ© en rĂ©gion semi-aride. Chaque placette a fait l’objet des mesures dendromĂ©triques suivantes : circonfĂ©rence Ă  1.30 m, hauteur totale, hauteur dominante, surface terriĂšre, densitĂ©, Ăąge et accroissement moyen du cerne auxquelles ont Ă©tĂ© associĂ©es des caractĂ©ristiques stationnelles : altitude, exposition et profondeur du sol. L’analyse des donnĂ©es a mis en Ă©vidence que l’exposition et l’altitude sont les facteurs dĂ©terminants pour la croissance du pin. Trois classes de fertilitĂ© ont pu ĂȘtre distinguĂ©es Ă  partir du couple « Ăąge/hauteur dominante

    Therapeutic use of spontaneous medicinal flora from an extreme environment (dune cordon) in Djelfa region, Algeria

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    Context: In some extreme environments such as dune cordon in the region of Djelfa, the ability of species to adapt to extreme conditions, especially climatic stresses, appears to be highly developed. Notwithstanding this importance from an ecophysiological point of view, the plant genetic resources of the Algerian steppe are very little known and especially poorly valued. Aims: To inventorying the spontaneous species in an extreme “dune cordon” environment of the Algerian steppe and to collect information on the ancestral know-how of the local populations in terms of therapeutic use of these species. Methods: Foremost, a herbarium has been made which includes all species inventoried in dune cordon, then an ethnobotanical survey materialized by a direct questionnaire was conducted with different actors involved in the field of medicinal plants. It concerns the traditional use of these species. Results: Seventeen plants (20%) of the listed plant species have been recognized and identified as medicinal species. These plants belong to 13 families of which the Lamiaceae family is the most represented, followed by Asteraceae and Poaceae. Several diseases are treated by these species by local populations, some have a definite therapeutic use while others are used in the treatment of several diseases. The most incriminated pathologies concern rheumatism, diabetes, dental pain, fever and renal function. Leaves are most used with decoction as the most used mode. Conclusions: Results of the study showed that dune cordon contains a wide variety of spontaneous plants, which have a beneficial interest. It also indicated the link between natural resources and humans and the therapeutic use of these species for profit by local population. The rich ethno-pharmacological knowledge of this population must be preserved and valued. A phytochemical screening and biological investigation are needed to test this ancestral know-how

    Diversité floristique du Mont Guerouaou (Sehary Guebli, Région de Djelfa, Algérie) en fonction des paramÚtres stationnels

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    The present work was conducted to examine the effect of environmental factors on the floristic diversity of Guerouaou Mount located in Bastama forest (Sehary Guebli massif) at Djelfa province (Algeria). Thirty-six floristic surveys (totaling 1600m2) were taken across an altitudinal gradient established on south and north exposures. The results revealed the presence of 77 species belonging to 23 botanical families of which Asteraceae, Poaceae and Fabaceae were the dominant families. In this area the therophytes are the principal biological type. The north exposition (predominance of trees) is characterized by high specific richness compared to the south exposition where shrubs are dominant. The multivariate analyses (HCA and CA) showed the presence of 4 groups of vegetation related to xeric and altitudinal gradients. Conservation and restoration strategies of these ecosystems are recommended.La prĂ©sente recherche a pour objectif l’étude de l’effet des facteurs stationnels sur la diversitĂ© floristique du Mont Guerouaou, partie intĂ©grante de la forĂȘt de Bastama (massif de Sehary Guebli), situĂ© en zone semi-aride Centre (AlgĂ©rie). Trente-six relevĂ©s floristiques (1 600 m2) ont Ă©tĂ© rĂ©alisĂ©s selon une toposĂ©quence du bas en haut de versant sur les deux expositions nord et sud. La zone d’étude abrite 77 espĂšces vĂ©gĂ©tales rĂ©parties en 23 familles dont les Asteraceae, Poaceae et Fabaceae sont les plus dominantes. Les thĂ©rophytes dĂ©tiennent la premiĂšre place des types biologiques. Du point de vue biogĂ©ographique, l’élĂ©ment mĂ©diterranĂ©en l’emporte sur les autres types. Le versant nord, dont la strate arborescente domine, est caractĂ©risĂ© par une richesse spĂ©cifique plus Ă©levĂ©e que le versant sud, dont la strate arbustive domine. L’analyse numĂ©rique multivariĂ©e (CAH et AFC) a permis de distinguer 4 groupes de relevĂ©s liĂ©s Ă  un gradient de xĂ©ricitĂ© exprimĂ© par l’exposition et un autre altitudinal. Une stratĂ©gie intĂ©grative de conservation doit ĂȘtre envisagĂ©e afin de prĂ©server ce rĂ©servoir de biodiversitĂ©. L’implication de la population locale doit constituer une prioritĂ© pour une utilisation rationnelle des ressources naturelles.Guit Brahim, Nedjimi Bouzid. DiversitĂ© floristique du Mont Guerouaou (Sehary Guebli, RĂ©gion de Djelfa, AlgĂ©rie) en fonction des paramĂštres stationnels. In: Ecologia mediterranea, tome 45 n°2, 2019. pp. 45-61

    Cicatrisation post-incendie de la pinÚde semi-aride de Bastama (Sehary Guebli, région de Djelfa, Algérie) / Post-fire resilience of the semi-arid pine forest of Bastama (Sehary Guebli, Djelfa region, Algeria)

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    Forest fires are one of the most important factors determining the Mediterranean landscape where the dynamics of post-fire recovery is generally variable over time and depends upon a number of environmental factors. A study on the post-fire resilience, Aleppo pine regeneration and biogenic soil parameters was carried out in Bastama arid forest (Sehary Guebli massif, Djelfa region, Algeria). Four stations were chosen on the north and south slopes of each of the two fire and control zones. Three topographical positions were distinguished on each slope (bottom, middle and top of slope). A total of 24 floristic surveys were carried out, as well as twelve 1 m ÂČ square quadrats for Aleppo pine seedling quantification and 24 soil samples were taken. The floristic study revealed a higher specific richness in the fire-area with a dominance of therophytes compared to other biological types. Fire improved the edaphic characteristics. The regeneration of the Aleppo pine seems on its way. Protection strategies against human and/ or animal pressure of this fragile ecosystem are suggested for a better regeneration of Aleppo pine seedlings.Les incendies de forĂȘts sont l’un des facteurs les plus importants qui façonnent le paysage mĂ©diterranĂ©en oĂč la dynamique de rĂ©cupĂ©ration aprĂšs un incendie est gĂ©nĂ©ralement variable dans le temps et dĂ©pend d’un certain nombre de facteurs. Une Ă©tude sur la cicatrisation postincendie de la vĂ©gĂ©tation, la rĂ©gĂ©nĂ©ration du pin d’Alep et le dosage des Ă©lĂ©ments biogĂšnes du sol a Ă©tĂ© conduite dans la forĂȘt de Bastama (massif de Sehary Guebli, rĂ©gion de Djelfa, AlgĂ©rie). Quatre stations ont Ă©tĂ© choisies sur les versants nord et sud de chacune des deux zones incendiĂ©e et tĂ©moin. Trois positions topographiques ont Ă©tĂ© distinguĂ©es sur chaque versant : bas versant, mi-versant et haut versant. Au total, 24 relevĂ©s floristiques ont Ă©tĂ© rĂ©alisĂ©s sur l’ensemble des stations, 12 carrĂ©s de 1 m ÂČ pour le recensement des semis de pin d’Alep et 24 prĂ©lĂšvements pĂ©dologiques pour doser diffĂ©rents Ă©lĂ©ments du sol. L’étude floristique a rĂ©vĂ©lĂ© une meilleure richesse spĂ©cifique de la zone incendiĂ©e avec une dominance des thĂ©rophytes par rapport aux autres types biologiques. Le passage du feu a globalement amĂ©liorĂ© les caractĂ©ristiques Ă©daphiques. La rĂ©gĂ©nĂ©ration du pin d’Alep semble ĂȘtre en cours. Nous suggĂ©rons la protection de la zone incendiĂ©e contre toute forme de pression humaine ou animale pour une bonne reprise des semis de pin d’Alep.Guit Brahim, Nedjimi Bouzid. Cicatrisation post-incendie de la pinĂšde semi-aride de Bastama (Sehary Guebli, rĂ©gion de Djelfa, AlgĂ©rie) / Post-fire resilience of the semi-arid pine forest of Bastama (Sehary Guebli, Djelfa region, Algeria). In: Ecologia mediterranea, tome 47 n°1, 2021. pp. 87-106

    DendroĂ©cologie du Pin d’Alep (Pinus halepensis Mill.) en fonction des paramĂštres stationnels dans le massif forestier de Senalba (Djelfa - AlgĂ©rie)

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    Relation between site parameters and Aleppo Pine (Pinus halepensis Mill.) dendroecology in Senalba forest area (Djelfa, Algeria). Aleppo Pine (Pinus halepensis Mill.) is a volunteering hardy species, very common in Mediterranean regions. This species has great economical, ecological and social values in Algeria. 120 sample plots were laid out on northern and southern slopes of Senalba forest area (Djelfa) located in a semi-arid region, to investigate the effect of altitude, aspect and soil depth on height, circumference at 1.30 m and annual ring growth. The results shown that aspect and altitude were the determining factors of Aleppo Pine growth. Three classes of fertility were distinguished in relation with dominant tree height and age.Á partir de transects intĂ©grant les variations d’altitude et d’exposition, 120 placettes de Pin d’Alep (Pinus halepensis Mill.) de 800 m ÂČ chacune ont Ă©tĂ© installĂ©es au niveau de quatre stations choisies dans le massif forestier de Senalba (Djelfa, AlgĂ©rie) situĂ© en rĂ©gion semi-aride. Chaque placette a fait l’objet des mesures dendromĂ©triques suivantes : circonfĂ©rence Ă  1.30 m, hauteur totale, hauteur dominante, surface terriĂšre, densitĂ©, Ăąge et accroissement moyen du cerne auxquelles ont Ă©tĂ© associĂ©es des caractĂ©ristiques stationnelles : altitude, exposition et profondeur du sol. L’analyse des donnĂ©es a mis en Ă©vidence que l’exposition et l’altitude sont les facteurs dĂ©terminants pour la croissance du pin. Trois classes de fertilitĂ© ont pu ĂȘtre distinguĂ©es Ă  partir du couple «ùge/hauteur dominante».Guit Brahim, Nedjimi Bouzid, Guibal FrĂ©dĂ©ric, Chakali Gahdab. DendroĂ©cologie du Pin d’Alep (Pinus halepensis Mill.) en fonction des paramĂštres stationnels dans le massif forestier de Senalba (Djelfa - AlgĂ©rie). In: Revue d'Écologie (La Terre et La Vie), tome 70, n°1, 2015. pp. 32-43

    État sanitaire des peuplements de Pin d’Alep (Pinus halepensis Mill.) dans le massif forestier de Senalba (Djelfa, AlgĂ©rie)

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    Health status of Aleppo pine stands (Pinus halepensis Mill.) in the natural Senalba forest (Djelfa -Algeria). This study aimed to analyse the health status of the natural Senalba Aleppo pine forest (Pinus halepensis Mill.) located in the semi-arid zone of Djelfa (Algeria). A stratified systematic sampling was adopted and 80 plots were set up along two transects established on south and north-facing slopes. Various dendrometric (tree height ; circumference at 1.30 m ; bark thickness ; age) and site parameters (exposure ; altitude ; soil depth ; calcareous rate ; soil pH) were measured. Results showed that the decline process preferentially impacted the trees located on the southern slope of Senalba Chergui forest and old trees located on the northern slope of Senalba Gharbi forest. However, the other parameters have no significant effect on the process of decline.La prĂ©sente Ă©tude consiste en un diagnostic de l’état sanitaire des peuplements naturels de Pin d’Alep (Pinus halepensis Mill.) dans les massifs forestiers de Senalba Chergui et Gharbi situĂ©s dans la zone semi-aride de la rĂ©gion de Djelfa (AlgĂ©rie). L’échantillonnage adoptĂ© est le systĂ©matique stratifiĂ©, ce qui a conduit Ă  installer 80 placettes au niveau des versants nord et sud de chacun des massifs selon deux transects nord/sud et est/ouest. DiffĂ©rents paramĂštres dendromĂ©triques (hauteur et circonfĂ©rence des arbres dĂ©pĂ©ris Ă  1,30 m, Ă©paisseur de l’écorce, Ăąge) et stationnels (exposition, altitude, profondeur du sol, pH, taux de calcaire) sont mesurĂ©s. TraitĂ©es et analysĂ©es, ces donnĂ©es nous ont permis de conclure que le phĂ©nomĂšne de dĂ©pĂ©rissement touche majoritairement les peuplements situĂ©s sur le versant sud pour la forĂȘt de Senalba Chergui et ceux sur-ĂągĂ©s situĂ©s sur le versant nord de la forĂȘt de Senalba Gharbi. Les autres paramĂštres stationnels ou dendromĂ©triques n’ont pas d’effet significatif sur le phĂ©nomĂšne.Guit Brahim, Nedjimi Bouzid, Chakali Gahdab, Guibal FrĂ©dĂ©ric. État sanitaire des peuplements de Pin d’Alep (Pinus halepensis Mill.) dans le massif forestier de Senalba (Djelfa, AlgĂ©rie). In: Revue d'Écologie (La Terre et La Vie), tome 71, n°2, 2016. pp. 156-167
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