https://dspace.univ-ouargla.dz/jspui/handle/123456789/27370 2026-04-10T12:53:11Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27391 Titre: STRUCTURE DEMOGRAPHIQUE ET REPARTITION SPATIALE DES POPULATIONS DE PINUS HALEPENSIS MILLDE LA FORET DOMANIALE DE BENI OUDJANA (KHENCHLA) Auteur(s): HANI Insaf; RACHED -KANOUNI Malika; ABABSA Labed Résumé: The establishment and interpretation of diameter and height structures is essential for forest management decision-making. This study aims to describe the diameter structure and spatial distribution of Pinus halpensis populations in the Beni Oudjana (Khenchela) forest. Knowledge of these parameters is an essential step in their sustainable management. The diameter at 1.30 m from the ground, the total height of P. halpensis individuals were measured on 6 plots according to an altitudinal gradient. The diameter and height structures were established according to the diameter or height classes and adjusted to the theoretical Weibull distribution. The density of the species increases according to this gradient from 4060 feet/hectare in plot P3 (at an altitude of 1472m) to 340 feet/hectare in plot P2 (1106m altitude). The stand of plot 4 is characterized by the lowest average values for diameter (5.784±7.03cm) height (3.19±2.56m), basal area (0.00±0.02m2/ha), total volume (0.03±0.10m3/ha) and relative density of 15%. Analysis of diameter and height structures shows an increase in the frequency of young individuals. These results contribute to the improvement of knowledge on current status indicators of natural P. halpensis stands that can be used as a basis for the management of the Beni Oudjana forest Description: Revue des bioressources 2019-12-31T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27389 Titre: SUSTAINABLE AGRICULTURAL DEVELOPMENT IN ARID ZONES: TO WHICH SPACES? AND WHICH SOCIETY? (CASE OF THE PROVINCE OF OUARGLA – ALGERIA) Auteur(s): Saida CHAOUCH Résumé: Having lived for centuries as part of a harmonious development adjusting the growth of spaces and agricultural production to the rate of growth of the population, the agriculture in Ouargla knows, strong changes following the policies creating new agrarian spaces and promoting a new category of farmers. Thus, in Ouargla there are two types of agriculture, one belonging to the oases, located in the old spaces and the other, new, dominated by neofarmers and placed in new areas. In order to know what types of agricultural areas and what category of farmers the sustainability of agriculture is based on, we examined four indicators namely, production, human component, sectors and natural potentialities. Encouraging the reconstitution of economically viable farms and the encouragement of oases are strongly recommended. Winning new spaces remains feasible in determining production priorities and favoring promising neo-farmers. Description: Revue des bioressources 2019-12-31T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27386 Titre: Variation in physico-chemical and biochemical parameters during the preparation of Raib from camel milk Auteur(s): MOSBAH Saïd; MEKKAOUI Safia; DAHIA Mostefa; BOUAL Zakaria; BOUDJENAH; HAROUN Saliha Résumé: The raw milk is a highly nutritious product. The preparation of Raib by spontaneous fermentation of milk requires strict control to minimize health risks. The aim of this study is to assess the effect of spontaneous fermentation of camel milk on the physicochemical and biochemical quality of Raib. The analysis of camel milk samples collected in the region of Ghardaïa, south of Algeria, are analyzed during fermentation time (T0 hour until 120 hours). The monitoring during the time has shown that the pH value decreases from 6.53 to 3.85 at T120H. Conversely, the value of Dornic acidity increased from 18 °D to 105 °D. As for the total dry matter and the ashes, these experienced a significant reduction in the rates respectively from 123.2 ± 8.1 and 8.38 ± 0.5 g/l to the rates of 113.4 ± 7.3 and 7.87 ± 0.6 g/l at T120H. Biochemical analyzes have revealed that fermentation leads to a significant reduction in fat which is from 45.2 g/l to 37.5 g/l at T120H. However, the lactose, total protein and casein content have decreased significantly. The rates increased respectively from 42.2 ± 2.03, 34.1 ± 1.1 and 28.05 ± 0.65 g/l to 23.4 ± 1.13, 29.0 ± 1.4 and 23.48 ± 1.45 g/l before and after fermentation. The lactic acid bacteria have a considerable initial load (3.83 Log10 ufc/ml) and increase to a high value after T120H (8.06 Log10 ufc/ml). These results indicate that the fermentation process induced by the development of the lactic acid bacteria of camel milk promotes the degradation of certain biochemical parameters. These results seem to be an asset in promoting fermentation products. Description: Revue des bioressources 2019-12-31T00:00:00Z https://dspace.univ-ouargla.dz/jspui/handle/123456789/27384 Titre: STRUCTURE ET COMPOSITION FLORISTIQUES DE LA FORET DE SIDI R’GHIES (OUM EL BOUAGHI) Auteur(s): Malika RACHED-KANOUNI; Sonia HABBI; Menal BOUAFENE; Karima KARA; Labed ABABSA Résumé: The objective of this study is the rational management of forest ecosystems for the sustainable conservation of plant biodiversity. Two types of analysis are carried out: the structural analysis and the analysis of the main species. In total, 3675 individuals are distributed in 5 families, separated between 7 species were identified. The dominant woody and grassy plant species are Pinus halepensis and Juniperusoxycedrus. Pinaceae and Cupressaceae are the most represented families. Mean values of species richness, Shannon diversity index are 3±1,2 et 0,71±0,30 species / plot respectively. The average density of woody trees in the Sidi R’Ghies forest is 735 ± 368 plants / ha with an average basal area of 23,01 ± 5,04m² / ha. The structure of the heights shows that the trees in the height classes between 2 and 4m have a very high density, proof of a natural regeneration. The total structure indicates that smaller trees are more abundant than larger ones (17,5 <d≤27,5cm). Indeed, this work is a database for the forest but it is only one of the facets to be considered in order to protect and restore it. Description: Revue des bioressources 2019-12-31T00:00:00Z