https://dspace.univ-ouargla.dz/jspui/handle/123456789/8431 Fri, 13 Mar 2026 00:33:46 GMT 2026-03-13T00:33:46Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/8829 Titre: EFFECTS OF SULLA CROP (Hedysarum coronariumL.) CONDUCTED IN DIRECT AND CONVENTIONAL DRILLINGS, ON THE PHYSICO-CHEMICAL PROPERTIES OF CLAY SOIL UNDER TUNISIAN SEMI-ARID CLIMATE Auteur(s): BOUAJILA Khedija; BEN JEDDI Faysal Résumé: The sulla crop (Hedysarum Coronarium L.) variety Bikra 21 was conducted in direct and conventional drillings, for treating the effects of this crop on some physicochemical properties of sloping land (6%). The experimental area is situated at Bou Salem (higher semi-arid) in the governorate of Jendouba (north-west of Tunisia). The organic sulla restitution has contributed to improve the contents of organic matter principally in layer. Indeed, the rates exceeded 3% in direct sowing as well as in the conventional one. However, the field in direct drilling was characterized by higher nitrogen contents (from 0.35 to 0.40 %). The presence of sulla improved soil structural stability (from 1.22 to 1.97 %) in direct drilling. Therefore, the cation exchange capacity was improved in layer, and was found better under the conditions of the direct drilling (from 60.2 to 65 meq/100g of soil) than in the conventional one (from 59 to 63.3 meq/100 g of soil). It should be noted that the presence of residues, especially on the surface supported the permeability of the ground, was mainly in direct drilling where the permeability was higher (17.83 cm/h in the surface of direct drilling versus 13.92 cm/h in the conventional one). Description: Algerian Journal of Arid And Environment (AJAE) Mon, 01 Jun 2015 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/8829 2015-06-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/8833 Titre: NDICATEURS DE DÉGRADATION DES BIO-RESSOURCES NATURELLES DE L’ALGÉRIE OCCIDENTALE: CAS DE LA STEPPE DE LA WILAYA DE SAIDA Auteur(s): HASNAOUI Okkacha; BOUAZZA Mohamed Résumé: The steppe formations of the western of Algeria are undergoing erosion of natural resources. Despite the different national programs aimed at the fight against this phenomenon, the situation continues to worsen and causes an imbalance of local ecosystems. The objective of this study is to understand the dynamics of edaphic and floristic heritage. The choice has focused on soil alfatiers widespread in the south of the wilaya of Saida. In this investigation of soil analysis coupled with floristic surveys were conducted. The sites chosen for this comparative study are sites which have undergone different anthropogenic impact (overgrazing, moderate grazing, low grazing). The results obtained from the physico-chemical analysis of soil, show a disruption of the studied parameters from one site to another. Eco-floristic analysis based on the stigmatic Bran Blanquet method reveals an erosion of plant constitution alfa structures. We notice a marked decrease in from a site to a moderately grazed pasture or slightly grazed site. The results of the correspondence analysis (AFC) clearly show the relationship between the dynamics of the soil and plant biodiversity. Description: Algerian Journal of Arid And Environment (AJAE) Mon, 01 Jun 2015 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/8833 2015-06-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/8836 Titre: Etude du potentiel de contamination des eaux de la nappe phréatique de la région de Ouargla (Sahara septentrional Est Algérien) Auteur(s): SLIMANI Rabia; GUENDOUZ Abdelhamid Résumé: Ouargla’s basin (Southeast of Algeria), is currently suffering from natural and anthropogenic groundwater degradation. This work was carried out in order to study the vulnerability and risk of contamination through the aquifer mapping and chemical parameters.The hydro-chemical study showed that the waters of the aquifer have a chemical facies dominant sodium chloride and sodium sulfate. The water temperature varies between 17.2°C and 29.4°C, the pH ranges from 6.33 to 9.16 and the electrical conductivity oscillates between 1.91 and 263 dS.m-1. These results reflect a strong mineralization of water in the region.The results obtained of the indices of organic pollution (IPO) and contamination index (CI) show an organic pollution that affects more than 64% of the measurement points and a mineral pollution of 73 %. The degree of vulnerability recorded increase from upstream to downstream of the basin in the direction of groundwater flow toward the north (Sebkhet Safioune) and the other to the West (Sebkhet Bamendil) Description: Algerian Journal of Arid And Environment (AJAE) Mon, 01 Jun 2015 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/8836 2015-06-01T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/8832 Titre: MCHANGEMENTS CLIMATIQUES ET RESSOURCES EN EAU EN ALGÉRIE: VULNÉRABILITÉ, IMPACT ET STRATÉGIE D’ADAPTATION Auteur(s): NICHANE Mohamed; KHELIL Mohamed Anouar Résumé: The climate changes for a long time ceased being a scientific curiosity. They constitute the major environmental question which dominates our time and the major challenge to which must answer the environmental organizations of control. Water, one of the most important raw materials in Algeria. Because of its importance, it is essential to know its vulnerability with the climate changes, in Algeria. In Algeria, the vulnerability with the climate changes is expressed through several aspects: demographic explosion, probable reduction in the water run-offs, scarcity of the resources, the degradation of the hydraulic infrastructures, threats at wetlands… etc. Face this situation, Algeria took quantitative and qualitative measures adaptive within the framework of a durable management of this invaluable resource for the future. Description: Algerian Journal of Arid And Environment (AJAE) Mon, 01 Jun 2015 00:00:00 GMT https://dspace.univ-ouargla.dz/jspui/handle/123456789/8832 2015-06-01T00:00:00Z