Journal articles: 'Forests and forestry – algeria'

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Merdas, Saifi, Tewfik Mostephaoui, and Mohamed Belhamra. "Reforestation in Algeria: History, current practice and future perspectives." REFORESTA, no. 3 (July 1, 2017): 116. http://dx.doi.org/10.21750/refor.3.10.34.

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Reforestation in Algeria has been recognized as a priority in different programs for the development and enhancement of forest heritage. Degradation factors of forest and soil contribute significantly to the decline in land values. The Algerian forests in the past, during the colonial period suffered considerable degradation. The degraded forest heritage has been undertaken with serious programs since independence. Several programs for the development of the forest sector through reforestation have been carried out. Unfortunately, the achievements were still below expectations. The launch of the National Reforestation Plan in 2000 has given the forestry sector a new lease of life with a vision that incorporates the productive aspect of reforestation, the industrial aspect, and the recreational aspect. Before the end of the NRP timeline, significant reforestation projects are completed. In a future projection, reforestation is integrated into the land use planning within the framework of the National Plan of Land Use Planning.

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Ksentini, Hana, Meddad-Hamza Amel, and Beddiar Arifa. "Degradation of mycorrhizal fungal communities associated with cork oak and understory vegetation by the anthropogenic factors." Folia Forestalia Polonica 64, no. 3 (September 1, 2022): 184–94. http://dx.doi.org/10.2478/ffp-2022-0018.

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Abstract The cork oak (Quercus suber L.) forests are ecosystems of high environmental and socioeconomic value in the Mediterranean basin. However, in Algeria, the cork oak forests are highly threatened by repeated fires, overgrazing and the anthropogenic pressure that weaken the ecosystem of cork oak and affect its natural regeneration. This degradation results in an alteration of many ecological components of the cork oak, such as fungal communities in the soil. Thus, the aim of this work is to study the effects of cork oak stand degradation on the diversity of mycorrhizal communities associated with Quercus suber and some of its understory shrubs (Cistus monspeliensis, Lavandula stoechas and Thymus vulgaris) in the forest of Brabtia (northeastern Algeria).For this purpose, two sites were chosen: one degraded by the anthropogenic factors and the other non-degraded one. Moreover, it is suggested that some plants of the understory shrub vegetation of cork oak, such as the cistus, lavender and thyme, prove to be favourable to the juvenile growth of this tree. The results obtained showed that the ectomycorrhizal (EcM) root colonization of cistus was higher compared to that of cork oak in both stations. The estimation of arbuscular mycorrhizal (AM) colonization showed significantly higher levels in the roots of cork oak, cistus, lavender and thyme in the degraded station compared with the non-degraded stations. In contrast, the rhizosphere soils of cork oak and cistus had low number of AM propagules and fungal spores, while under the roots of lavender and thyme, these two parameters were greatly improved with the abundance of the genera Glomus and Gigaspora. These results underline the need to take into account the plant–fungus interactions in the development of restoration strategies of the degraded soils and forest ecosystems.

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Louail, Amal, François Messner, Yamna Djellouli, and Rachid Gharzouli. "Remote Sensing and Phytoecological Methods for Mapping and Assessing Potential Ecosystem Services of the Ouled Hannèche Forest in the Hodna Mountains, Algeria." Forests 13, no. 8 (July 22, 2022): 1159. http://dx.doi.org/10.3390/f13081159.

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Regardless of their biogeographic origins or degree of artificialization, the world’s forests are a source of a wide range of ecosystem services (ES). However, the quality and quantity of these services depend on the type of forest studied and its phytogeographic context. Our objective is to transpose the concept of ES, in particular, the assessment of forest ES, to the specific Mediterranean context of the North African mountains, where this issue is still in its infancy and where access to the data needed for assessment remains difficult. Our work presents an introductory approach, allowing us to set up methodological and scientific milestones based on open-access remote sensing data and already tested geospatial processing associated with phytoecological surveys to assess the ES provided by forests in an Algerian study area. Specifically, several indicators used to assess (both qualitatively and quantitatively) the potential ES of the Ouled Hannèche forest, a forest located in the Hodna Mountains, are derived from LANDSAT 8 OLI images from 2017 and an ALOS AW3D30 DSM. The qualitative ES typology is jointly based on an SVM classification of topographically corrected LANDSAT images and a geomorphic-type classification using the geomorphon method. NDVI is a quantitative estimator of many plant ecosystem functions related to ES. It highlights the variations in the provision of ES according to the types of vegetation formations present. It serves as a support for estimating spectral heterogeneity through Rao’s quadratic entropy, which is considered a relative indicator of biodiversity at the landscape scale. The two previous variables (the multitemporal NDVI and Rao’s Q), completed by the Shannon entropy method applied to the geomorphon classes as a proxy for topo-morphological heterogeneity, constitute the input variables of a quantitative map of the potential supply of ES in the forest determined by Spatial Multicriteria Analysis (SMCA). Ultimately, our results serve as a useful basis for land-use planning and biodiversity conservation.

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Younsi, Salah Eddine, Yasmine Adjami, Rym Ghanem, Billel Bouchaib, and Mohamed Laid Ouakid. "Impact of different factors degrading cork oak stands in the Mediterranean region: A case study from Algeria." Journal of Forest Science 67, No. 12 (December 17, 2021): 570–81. http://dx.doi.org/10.17221/77/2021-jfs.

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In recent years, the cork oak forests that characterise the Mediterranean region have been exposed to various factors that result in their degradation. These cork oak trees, due to increasingly accentuated anthropogenic activity, undergo withering at different scales.The objective of the study is to assess the impact of various factors that degrade cork oak forests in the Mediterranean region located in northeastern Algeria, and this was achieved by prospecting 22 sampling locations. This allowed the creation of a database containing 745 trees that were observed and 27 measured variables. Different readings were then taken into consideration based on measurements and sometimes on ratings. The impact of several biotic and abiotic factors, which affect and damage the health of cork oak, was identified. These factors include in particular the infestations by xylomycetophagous insects such as Platypus cylindrus and Xyleborus sp., which can potentially infest the cork oak trees that we observed one year after bark harvesting. On the other hand, the stationary descriptors such as altitude, slope, exposure, etc., are important for the dendrometric and exploitation characteristics, but their unfavourable values do not necessarily lead to tree mortality; for example, medium to low slopes, associated with average altitudes of 600 m a.s.l., may ensure the healthiest trees like in our case study. Finally, we were able to find that certain decline factors may affect a particular category of trees, either because they are older, taller or have a large girth, or because they are subject to inadequate debarking.

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Camarero, J. Julio, Raúl Sánchez-Salguero, Montserrat Ribas, Ramzi Touchan, Laia Andreu-Hayles, Isabel Dorado-Liñán, David M. Meko, and Emilia Gutiérrez. "Biogeographic, Atmospheric, and Climatic Factors Influencing Tree Growth in Mediterranean Aleppo Pine Forests." Forests 11, no. 7 (July 6, 2020): 736. http://dx.doi.org/10.3390/f11070736.

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There is a lack of knowledge on how tree species respond to climatic constraints like water shortages and related atmospheric patterns across broad spatial and temporal scales. These assessments are needed to project which populations will better tolerate or respond to global warming across the tree species distribution range. Warmer and drier conditions have been forecasted for the Mediterranean Basin, where Aleppo pine (Pinus halepensis Mill.) is the most widely distributed conifer in dry sites. This species shows plastic growth responses to climate, being particularly sensitive to drought. We evaluated how 32 Aleppo pine forests responded to climate during the second half of the 20th century by using dendrochronology. Climatic constraints of radial growth were inferred by fitting the Vaganov–Shashkin (VS-Lite) growth model to ring-width data from our Aleppo pine forest network. Our findings reported that Aleppo pine growth decreased and showed the highest common coherence among trees in dry, continental sites located in southeastern and eastern inland Spain and Algeria. In contrast, growth increased in wetter sites located in northeastern Spain. Overall, across the Aleppo pine network tree growth was enhanced by prior wet winters and cool and wet springs, whilst warm summers were associated with less growth. The relationships between site ring-width chronologies were higher in nearby forests. This explains why Aleppo pine growth was distinctly linked to indices of atmospheric circulation patterns depending on the geographical location of the forests. The western forests were more influenced by moisture and temperature conditions driven by the Western Mediterranean Oscillation (WeMO) and the Northern Atlantic Oscillation (NAO), the southern forests by the East Atlantic (EA) and the august NAO, while the Balearic, Tunisian and northeastern sites by the Arctic Oscillation (AO) and the Scandinavian pattern (SCA). The climatic constraints for Aleppo pine tree growth and its biogeographical variability were well captured by the VS-Lite model. The model performed better in dry and continental sites, showing strong growth coherence between trees and climatic limitations of growth. Further research using similar broad-scale approaches to climate–growth relationships in drought-prone regions deserves more attention.

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Bouzid, A., K. Bouzid, and K. Benabdeli. "Contribution the Failure Mode Analysis and Criticality Evaluation Method to the Rehabilitation of Cork Oak (Quercus suber) Forests in Forest Massif of Tlemcen (Algeria)." Jurnal Manajemen Hutan Tropika (Journal of Tropical Forest Management) 28, no. 2 (August 9, 2022): 191–200. http://dx.doi.org/10.7226/jtfm.28.2.191.

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The controling of forest sustainability and preforest ecosystems in achieving stability of forest ecosystem require the identification of biophysical indicators, anthropological, and technological. The significant degradation of Quercus suber formations in forest massif of Tlemcen (Algeria) are imposed by both climatic factors, the fires, the overgrazing land, anthropogenic aggression as well as by ineffective management. The making of a reference matrix would make possibility the identification of probable hazards and risks. This study aimed to identify the understanding how the mode of operation of a system to identify failures and treat, and the create the intention of eliminating or minimizing the associated risks. This matrix will consist of relevant indicators which easy guide to estimate and following the understanding of the forest degradation process in Algeria. The FMECA method allowed identification of 20 main defective targets which be grouped into 3 categories namely: technical, ecological, organizational, and facilitate of remediation. Each error can be scored and action plans can be prioritized, allowing different with all forest sector players to better understand the degradation of this natural space in order to implement efficient and appropriate remediation plans.

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Sarmoum, Mohamed, J. Julio Camarero, and Fatiha Abdoun. "Aridification increases growth resistance of Atlas cedar forests in NW Algeria." Forest Ecology and Management 556 (March 2024): 121730. http://dx.doi.org/10.1016/j.foreco.2024.121730.

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Meddah, Fadéla, and Najat Zatla. "La Valorisation Des Ressources Forestières Au Niveau De La Wilaya De Saida." European Scientific Journal, ESJ 14, no. 18 (June 30, 2018): 138. http://dx.doi.org/10.19044/esj.2018.v14n18p138.

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The forestry economy tends to become a privileged way of development, making it possible to offer to the territories in mutation an alternative means of production. Algeria has been trying since 2008 (in accordance with the master plan for natural areas and protected areas) a forest policy that takes into account the multiple roles that the forest can play : protection, production and social promotion. This work aims to study the process of valorization of forest resources in territory of Saida. The process is based mainly on two advances : the exhaustive identification of resources and the development of valorization mode. These advances can not be maintained, unless, a territorial dynamic associating the actors of the sector of the forests and the actors of the territory, will be created. An entry by the territory, the resources and territorial development is privileged. This theoretical entry is illustrated by a comprehensive approach based on the analysis of stakeholder surveys and articulated with quantitative analysis. This analysis conclude that the territorial dynamics are absent at the level of the territory , which has led to an under-exploitation of resources.

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Sebti, Safia, Luís Bonifácio, and Gahdab Chakali. "Role of Egg Parasitoids in Controlling the Pine Processionary Moth in the Cedar Forests of Chréa National Park (Algeria)." Forests 13, no. 2 (January 31, 2022): 211. http://dx.doi.org/10.3390/f13020211.

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The sustainable protection of cedar stands in Chréa National Park can only be accomplished through the stability of the ecosystem. Outbreaks of Thaumetopoea pityocampa are a major threat and are largely attributed to the high population fecundity, changes in the diversity of natural enemies and global interactions within the ecosystem. Egg parasitoids (Hymenoptera) are essential in the biological control of T. pityocampa. To assess the impact of the parasitoids on the populations of the pine processionary moth, egg masses from cedar plantations were collected, reared in a laboratory and checked regularly for the emergence of the egg parasitoids: Trichogramma embryophagum, Baryscapus servadeii and Ooencyrtus pityocampa. Observations showed an inter-annual variation in the abundance of the three parasitoids as a result of the variation in the population density of the processionary moth, and on the underlying effect of temperature. Parasitoids had variable parasitism rates, with yearly averages ranging from 3.86% to 51.14%, dependent on the spatiotemporal distribution of the host populations. The aggregate effect of multiple parasitoid species could optimize control of T. pityocampa in cedar stands.

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Benguerai, Abdelkader, Khéloufi Benabdeli, and Abdelkader Harizia. "Forest Fire Risk Assessment Model Using Remote Sensing and GIS Techniques in Northwest Algeria." Acta Silvatica et Lignaria Hungarica 15, no. 1 (June 1, 2019): 9–21. http://dx.doi.org/10.2478/aslh-2019-0001.

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Abstract Algeria loses more than 20,000 hectares of forest to fire every year. The losses are costly both in terms of life and property damage, which weighs heavily on the environment and the local economy. Geomatics can complement the conventional methods used in fire hazard prevention and management. The objective of our study is to use the geographic information system (GIS) and the Remote Sensing (RS) technology to develop the fire risk assessment map of the forest massif of Zelamta located in Southeast Mascara province (Northwest Algeria). The methodology employed was an empirical model involving three parameters that can control fire behaviour: geomorphology, vegetal cover combustibility, and human activity. The obtained results can help in the decision-making process as well as provide cartographic support for forest fire prevention and management.

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BELAID, Kathia, Luke J. POTGIETER, Said AMRANI, Madjid ZIZI, and Hassen GHERBI. "Casuarina species in Algeria: reviewing their identity, distribution and symbiotic status." BOIS & FORETS DES TROPIQUES 351 (February 28, 2022): 15–28. http://dx.doi.org/10.19182/bft2022.351.a36386.

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Since their introduction at the beginning of the 19th century, Casuarina species have become important components of the Algerian landscape, yet the numbers of species present in Algeria and their identity, distribution, and symbiotic status are still not well understood. A survey conducted on 2,304 trees in 96 Casuarina stands across Algeria indicates that they are represented exclusively by five species: Casuarina cristata Miq., C. cunninghamiana Miq., C. equisetifolia L., C. glauca Sieber ex Spreng. and C. junghuhniana Miq. Two species, C. cunninghamiana and C. glauca, were the most common – the former occurring more often in the relatively humid and temperate areas of the country while the latter is most frequent in the drier and warmer areas. Production of seedlings of C. cunninghamiana and C. glauca in 12 nurseries resulted in low rates of spontaneous mycorrhizal infection frequency and nodulation, suggesting that inoculation of seedlings with selected mycorrhizal fungi and/or Frankia strains in the nursery would be necessary to improve their establishment in the field. This study is the first survey of the geographical distribution of Casuarina species in Algeria and should lead to more efficient utilization of this widely used tree genus in Algeria.

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Stevenson, Anthony C., Jamie Skinner, G. Edward Hollis, and Michael Smart. "The El Kala National Park and Environs, Algeria: An Ecological Evaluation." Environmental Conservation 15, no. 4 (1988): 335–48. http://dx.doi.org/10.1017/s0376892900029830.

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The structure of the El Kala National Park, its aims, zonation scheme for conservation and development, and boundaries, are described. Those ecobiomes and ecosystems which merit the highest classification and protection within the National Park are described and evaluated along with the numerous sites of similar importance outside the Park. A summary evaluation table (Table III) of the habitats, the species, and the resources for sustainable utilization, is presented.Three wetlands within the Park—Lake Oubeïra (perennial freshwater lake: a Ramsar Convention site important for wintering waterfowl), Lake Tonga (semi-perennial freshwater lake with surrounding marsh and earn a Ramsar Convention site with significant numbers of breeding waterbirds), and the Bou Redim marsh (freshwater carr with open water and a breeding colony of herons) are placed in the highest category of protection for the National Park. Four wetlands outside the National Park—the Mkhada marsh (8,900 ha of seasonally-flooded freshwater marsh), Lake Fetzara (15,000 ha freshwater lake now refilled with water in winter), Lac des Oiseaux (40 ha perennial freshwater lake), and the Cheffia Reservoir (3,000 ha)—are considered as important and consequently deserving of legislative protection. A marine section of the Park needs further study.The highest level of protection is recommended for the coastal dunes, including alder carrs, within and outside the Park; for the pristine low-montane Cork Oak woodlands, including the last remnants of Pinus pinaster ssp. renoui in Algeria; for the rare Lusitanian Oak forests including the small and declining Algerian population of Barbary Deer (Cervus elephas barbarus); and for some of the last remaining riverine woodland in North Africa. In addition, the healthy and diverse population of raptors is noted. The megalithic and later archaeological remains are extensive, valuable, and little-known.MEcological improvements to Lakes Tonga and Fetzara, which were drained in the 1930s, have recently developed from the operation of the old sluices to hold water back in the lakes, although at Lake Tonga some of the marginal vegetation and alder forest appears to be suffering from the prolonged inundation. The construction of the large Mexanna Dam within the National Park will desiccate the Mkhada Marsh, and Lake Oubeïra may have its ecological character changed if it is used for regulatory storage. The dune ecosystems are being affected by agriculture, groundwater pumping, industrial forestry (including perhaps a pulp mill), and the new road which is being driven into the heart of the dunes. Fishing and aquaculture may further reduce the suitability of Lakes Oubeïra and Melah for wintering waterfowl, and deliberate fires continue to ravage the Cork Oak forests.

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Bouldjedri, Mohammed, Gerard De Belair, Boualem Mayache, and Mohamed Sebti. "A new species for the vascular flora of Algeria: Cyperus eragrostis (Cyperaceae)." Hacquetia 21, no. 1 (February 12, 2022): 187–95. http://dx.doi.org/10.2478/hacq-2021-0018.

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Abstract This study provides a definition and description of Cyperus eragrostis as a new alien species to Algeria and North African flora. This hemicryptophyte, native to the tropical parts of South America, is recorded for the first time in Jijel eco-complex wetlands in North-East Algeria. Applying the standard phytosociological method we studied the stands in which this alien species grows together with other hygrophilous and ruderal species. The present study improves the knowledge of the Algerian flora and completes the information about the distribution of C. eragrostis reported by the available international literature and public herbaria.

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Roula, Salah Eddine, Rachid T. Bouhraoua, and Filipe X. Catry. "Factors affecting post-fire regeneration after coppicing of cork oak (Quercus suber) trees in northeastern Algeria." Canadian Journal of Forest Research 50, no. 4 (April 2020): 371–79. http://dx.doi.org/10.1139/cjfr-2019-0181.

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Wildfires may have serious and long-lasting impacts in Mediterranean Basin oak forests. Although cork oak (Quercus suber L.) is usually considered a highly fire-resistant tree species, post-fire recovery is not guaranteed. We assessed the mortality and regeneration of 729 cork oak trees that burned and were cut in six sites with the objective of identifying the main factors affecting the short- to medium-term post-fire recovery. We used linear mixed models to investigate potential relationships among tree stump status at the end of the second and fifth growing seasons and several tree- and site-level variables. Overall tree mortality in the second year was 44% and was negatively affected by bark thickness and positively affected by root exposure, trunk injuries, and diameter, in decreasing order of importance. Between the second and fifth years, mortality increased to 53%, but this increase was only observed in sites with high grazing pressure. Grazing also had a strong negative impact on the growth of basal resprouts, thereby compromising tree recovery. The results give useful information on the need for application of adequate forest management practices (particularly avoiding debarking injuries, soil erosion, and grazing pressure) to increase the resilience of these ecosystems and reduce the negative economic and ecological impacts of wildfires.

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Anteur, Djamel, Abdelkrim Benaradj, Youcef Fekir, and Djillali Baghdadi. "Zakour Forest fire risk map assessment in the commune of Mamounia (Mascara, Algeria)." Folia Forestalia Polonica 63, no. 1 (March 1, 2021): 21–35. http://dx.doi.org/10.2478/ffp-2021-0003.

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Abstract The great forest of Zakour is located north of the commune of Mamounia (department of Mascara). It is considered the lung of the city of Mascara, covers an area of 126.8 ha. It is a forest that is subject to several natural and human constraints. Among them, the fires are a major danger because of their impacts on forest ecosystems. The purpose of this work is to develop a fire risk map of the Zakour Forest through the contribution of geomatics according to natural and anthropogenic conditions (human activities, agglomeration, agricultural land) while integrating information from ground on the physiognomy of the vegetation. For this, the creation of a clearer fire risk map to delimit the zones potentially sensitive to forest fires in the forest area of Zakour. This then allows good implementation of detection management plans, for better prevention and decision-making assistance in protecting and fighting forest fires.

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Bensaci, Oussama Ali, Riadh Beghami, and Kamel Gouaref. "First report of Apiognomonia errabunda on Quercus ilex in Algeria." Folia Forestalia Polonica 63, no. 1 (March 1, 2021): 10–20. http://dx.doi.org/10.2478/ffp-2021-0002.

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Abstract Anthracnose of holm oak (Quercus ilex L.) was studied in several sites located in Belezma National Park (Eastern Algeria). Disease severity varied according to the site, but symptoms were particularly frequent on leaves supported by south-facing twigs. Leaves inserted on the distal part of twigs were more affected by anthracnose regardless of twigs’ position on trees. The fungal isolates obtained from damaged tissues were sorted to five morphotypes and identified as Apiognomonia errabunda based on morphological characteristics and ITS sequencing. This is the first record of the occurrence of the fungus Apiognomonia errabunda on Quercus ilex in Algeria. Particular climatic conditions marked by late spring rains followed by high temperatures may play a key role in the increased leaf vulnerability of Q. ilex to infection.

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Bardadi, Abdelkader, Zahira Souidi, Marianne Cohen, and Mohamed Amara. "Land Use/Land Cover Changes in the Tlemcen Region (Algeria) and Classification of Fragile Areas." Sustainability 13, no. 14 (July 12, 2021): 7761. http://dx.doi.org/10.3390/su13147761.

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The Tlemcen region is characterized by very diverse and steep areas exposed to gravity hazards, especially in high and medium mountain areas. Tlemcen National Park was chosen for this study, the main objective of which is to map fragile areas in close relation to reduced vegetation cover due to land-use changes and forest fires. Multi-source data were used to monitor land use/land cover (LULC)patterns in the study area between 1987 and 2017. The methodology is based on an object-oriented classification of the Landsat images, using the K nearest neighbor method for mapping the major LULC classes at the national park level. The results show that LULC is constantly changing in the study area. In 1987, the landscape was made up of (16.5%) oak forests (holm oak, cork oak, zean oak) and Aleppo pine, which then deteriorated following repeated fires in the nineties to barely represent 7.22% of the surface in 1995, followed by a fast forest reclamation, with the forest area doubling in 10 years (13.46% of the area in 2005), and a near stabilization of the forest cover in 2017 with 14.68% of the area. These mutations are mainly due to fluctuations in anthropogenic action. Despite past declines and disturbances, the current forested area in the Tlemcen area represents significant forest capital classified as a national park to be protected and developed.

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Meko, David M., Ramzi Touchan, Dalila Kherchouche, and Said Slimani. "Direct Versus Indirect Tree Ring Reconstruction of Annual Discharge of Chemora River, Algeria." Forests 11, no. 9 (September 14, 2020): 986. http://dx.doi.org/10.3390/f11090986.

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Annual river discharge is a critical variable for water resources planning and management. Tree rings are widely used to reconstruct annual discharge, but errors can be large when tree growth fails to respond commensurately to hydrologically important seasonal components of climate. This paper contrasts direct and indirect reconstruction as statistical approaches to discharge reconstruction for the Chemora River, in semi-arid northeastern Algeria, and explores indirect reconstruction as a diagnostic tool in reconstruction error analysis. We define direct reconstruction as predictions from regression of annual discharge on tree ring data, and indirect reconstruction as predictions from a four-stage process: (1) regression of precipitation on tree rings, (2) application of the regression model to get reconstructed precipitation for grid cells over the basin, (3) routing of reconstructed precipitation through a climatological water balance (WB) model, and (4) summing model runoff over cells to get the reconstructed discharge at a gage location. For comparative purposes, the potential predictors in both modeling approaches are the same principal components of tree ring width chronologies from a network of drought-sensitive sites of Pinus halepensis and Cedrus atlantica in northern Algeria. Results suggest that both modeling approaches can yield statistically significant reconstructions for the Chemora River. Greater accuracy and simplicity of the direct method are countered by conceptual physical advantages of the indirect method. The WB modeling inherent to the indirect method is useful as a diagnostic tool in error analysis of discharge reconstruction, points out the low and declining importance of snowmelt to the river discharge, and gives clues to the cause of severe underestimation of discharge in the outlier high-discharge year 1996. Results show that indirect reconstruction would benefit most in this basin from tree ring resolution of seasonal precipitation.

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Benbelaïd, Fethi, Abdelmounaïm Khadir, Mourad Bendahou, Mohamed Amine Abdoune, Alain Muselli, and Jean Costa. "Composition and antimicrobial activity of Cistus munbyi essential oil: an endemic plant from Algeria." Journal of Forestry Research 28, no. 6 (April 5, 2017): 1129–34. http://dx.doi.org/10.1007/s11676-017-0387-6.

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Sakhraoui, Nora, Filip Verloove, and Azzedine Hadef. "First record of Ficus microcarpa L. f. (Moraceae) in Algeria." Hacquetia 21, no. 2 (July 9, 2022): 347–54. http://dx.doi.org/10.2478/hacq-2022-0008.

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Abstract The escape from cultivation of Ficus microcarpa (Moraceae, Magnoliopsida) in Algeria is here reported. Several localities where the species reproduces from seeds have been discovered recently in northeastern Algeria. A map of its current distribution in the study area is provided. The species colonizes mainly urban habitats (walls, balconies and sidewalks) but its propagation in the natural environment is being facilitated by birds that disseminate the seeds over long distances. Ficus microcarpa can be considered as in the process of naturalization in Algeria. An updated key to species of the genus Ficus in Algeria is provided.

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Lazreg, F., L. Belabid, J. Sanchez, E. Gallego, and B. Bayaa. "Pathogenicity of Fusarium spp. associated with diseases of Aleppo-pine seedlings in Algerian forest nurseries." Journal of Forest Science 60, No. 3 (April 2, 2014): 115–20. http://dx.doi.org/10.17221/65/2013-jfs.

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In northwestern Algeria, the production of Aleppo pine (Pinus halepensis Mill.) seedlings in four nurseries is hindered by the damping-off disease. Results obtained indicated that Fusarium spp. are commonly found on diseased seedlings, in most containers and bare-root nurseries. Twenty-one isolates of Fusarium, belonging to seven species, were previously isolated from diseased seedlings, and identified based on their morphological and molecular characteristics and their sequences had been deposited in NCBI-Genbank. These isolates were tested for their pathogenicity to local Aleppo pine seeds. The highest inhibition was observed with F. redolens and F. solani, with 75 and 69.3%, respectively. The root growth inhibition of the Aleppo pine seedlings was significantly different for each isolate. The influence of various isolates of Fusarium spp. on seed germination, shoot and root length and vigour index was significantly different. The disease incidence caused by F. redolens and F. solani was 91 and 90%, respectively.  

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Khater, Nadia, and Halima Benbouza. "Preservation of Juniperus thurifera L.: a rare endangered species in Algeria through in vitro regeneration." Journal of Forestry Research 30, no. 1 (March 26, 2018): 77–86. http://dx.doi.org/10.1007/s11676-018-0628-3.

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Zouidi, Mohamed, Habib Borsali Amine, Ayoub Allam, and Raphael Gros. "Microbial activities and physicochemical properties of coniferous forest soils in two forest areas (arid and semi-arid) of western Algeria." Bosque (Valdivia) 40, no. 2 (2019): 163–71. http://dx.doi.org/10.4067/s0717-92002019000200163.

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Zennir, Rabah, and Boubaker Khallef. "Forest fire area detection using Sentinel-2 data: Case of the Beni Salah national forest ‒ Algeria." Journal of Forest Science 69, no. 1 (January 25, 2023): 33–40. http://dx.doi.org/10.17221/50/2022-jfs.

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Benzina, Imene, Farid Bekdouche, and Abdelkrim Si Bachir. "Post-fire dynamics of recolonization by Cistus plants in the Aleppo pine and Cork oak forests in Bejaia region, central north Algeria." Environmental & Socio-economic Studies 12, no. 2 (June 1, 2024): 40–47. http://dx.doi.org/10.2478/environ-2024-0011.

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Abstract In August 2021, very intense fires swept through various forested areas in northern Algeria, particularly in Kabylia. The population dynamics of Cistus salviifolius and Cistus monspeliensis were studied along a post-fire successional gradient during the first nine months (September 2021 – May 2022), in two forest communities: the Cork oak (Quercus suber) and the Aleppo pine (Pinus halepensis) forests in the coastal zone of Bejaia province. The Cistus spp. germinations were counted monthly in each forest on 10 plots of 1 m2, evenly distributed along 2 transects of 45 m each. The results showed that the majority of germinations occur in December with 207.5 ± 24.2 seedlings in the Cork oak forest and 171.3 ± 18.0 seedlings in the Aleppo pine forest. Student's t-test does not reveal significant differences for December between the two communities. During the first months following the fire (September and October 2021), germinations were almost absent. The monthly rainfall in September 2021 was estimated at 16.25 mm, an insufficient amount for effective germination. Late germination results in an extension of its period, showed a high rate in January 2022 with 42.2 ± 2.1 and 11.5 ± 0.8 seedlings, respectively, in the Cork oak forest and the pine forest. Beyond January, germination was practically nonexistent in both communities. Therefore, the majority of the seed germination was concentrated in November, December, and January with a unimodal germination pattern.

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Meddour, Rachid, Ouahiba Sahar, and Guy Bouxin. "Syntaxonomical survey of cork oak forests (Quercus suber L.) in the province of Tizi Ouzou, Kabylia, Northern Algeria." Hacquetia 21, no. 2 (July 9, 2022): 297–325. http://dx.doi.org/10.2478/hacq-2022-0007.

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Abstract This study is a contribution to the knowledge of the floristic composition and syntaxonomical significance of Quercus suber woodlands of Tizi Ouzou province, which represent the last remnants of ancient forests. The field surveys were taken in several locations representative of cork oak woodlands, using the Braun-Blanquet method. A matrix of 96 phytosociological relevés and 160 plant taxa was treated with clustering analysis and correspondence analysis. These multivariate analyses showed congruent results and allowed the definition of four main clusters of cork oak woodlands, corresponding to four syntaxa according to synecological and syndynamic gradients. They belong to three associations, of which one is newly described, and two subassociations. They are: Sileno imbricatae-Quercetum suberis ass. nov., a mesophilous association newly described here, on siliceous soils and in the humid ombrotype; Cytiso villosi-Quercetum suberis, a mesophilous association, with two subassociations: quercetosum canariensis, and myrtetosum communis, this later reported for the first time in the study area, and both localized in the humid ombrotype and confined on markedly acid soils; Erico arboreae-Myrtetum communis, thermophilous secondary shrubland association developed in the subhumid ombrotype, on flysch substrates, also identified for the first time in this area. Syntaxonomic, synecological and syndynamic considerations are given for each syntaxon.

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Beghami, Riadh, Nabil Bertella, Malik Laamari, and Oussama Ali Bensaci. "Bark beetle and woodborer insects’ outbreak as a potent driver of Atlas cedar (Cedrus atlantica (Endl.) Carriere) forests dieback in Aures -East Algeria-." Forest Science and Technology 16, no. 2 (April 2, 2020): 75–85. http://dx.doi.org/10.1080/21580103.2020.1756929.

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Sakhraoui, Nora, Filip Verloove, Azzedine Hadef, Sonia Rouidi, and Hamdi Dziri. "Additional records on the occurrence of two alien Leguminosae in Algeria." Hacquetia 22, no. 2 (June 30, 2023): 263–70. http://dx.doi.org/10.2478/hacq-2022-0017.

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Abstract During field surveys, carried out between 2021 and 2022 in northeastern Algeria, two populations of Tipuana tipu (Benth.) Kuntze were discovered. One population was located in the middle of a quite natural habitat in the Filfilla region (wilaya of Skikda). This population seems more or less established and can be considered to be at the beginning of the naturalization process, a degree of naturalization not previously reported in Algeria and mainland North Africa. The surveys also revealed several populations of Paraserianthes lophantha (Vent.) I.C. Nielsen, a species that was recently reported as naturalized in Algeria but for which details on its naturalization were lacking. Details about the localities in which the two species were observed are given, including a present map of their distribution and field photographs. A key for the identification of both genera is also provided.

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Zoudi, Mohamed, Amine Habib Borsal, Ayoub Allam, Raphael Gros, Catherine Rebufa, and Anne-Marie Farnet Da Silva. "Comparative Local Case Study of Coniferous Forest Litter of the "Pinus halepensis Mill" in Arid and Semi-arid Areas of Western Algeria." Acta Silvatica et Lignaria Hungarica 16, no. 1 (2020): 39–50. http://dx.doi.org/10.37045/aslh-2020-0003.

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Azzaoui, Mohamed, Benchohra Maamar, Leila Soudani, Belgacem Nouar, Mohamed Berreyah, and Mohamed Maatoug. "Spatial dynamics of land cover in the Sdamas region (Tiaret, Algeria)." Journal of Geology, Geography and Geoecology 27, no. 1 (July 10, 2018): 12–19. http://dx.doi.org/10.15421/111825.

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The Sdamas massif to which our contribution relates is located in West Algeria, it is an integral part of the Tiaret mountains. The aim of our study is to analyze the land cover of the Sdamas region over a 43-year interval grouped into 9 thematic classes: mineral surfaces (urban planning), wetland, vegetation, bare soils and fallow etc. The spatial and temporal dynamics of land use require regular monitoring of vegetation cover from remote sensing imagery. It is for this reason that we relied on field data to perform the diachronic analysis with three well-defined scenes 1972, 1998 and 2015, using Landsat satellite images (MSS, TM and ETM +). The analysis of these maps covering the same region shows the different changes that have taken place at ground level. We found that our natural plant space has undergone a strong degradation, disruption and regression because of different human activities, namely: overgrazing, clearing, fires, urbanization, (there has been a remarkable increase in the population of the communes of the study area). Inadequate and ineffective forestry interventionsand work, and lack of sustained protection are reasons of these processes. Factors affecting the forest ecosystem are bioclimate and human action. Indeed, the bioclimate, through atmospheric drought, is the main factor governing the diversity of these formations of the Sdamas mountains.

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Akli, Amel, Zaida Lorenzo, Ricardo Alía, Khellaf Rabhi, and Enrique Torres. "Morphometric Analyses of Leaf Shapes in Four Sympatric Mediterranean Oaks and Hybrids in the Algerian Kabylie Forest." Forests 13, no. 4 (March 25, 2022): 508. http://dx.doi.org/10.3390/f13040508.

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(1) Background: local morphological variation can provide useful information to clarify the role of hybridization in Mediterranean oaks. Accordingly, we have characterized putative hybrids and oak species coexisting in a highly diversified oak forest in Algeria with four native oak species (Quercus suber L., Q. ilex L., Q. canariensis Willd., and Q. afares Pomel). (2) Methods: sixteen plots, including 89 trees from the four native species and their putative hybrids were sampled. Leaves were scanned and their geometric morphometry analyzed by using 11 landmarks on the right side on their abaxial surface. Variation within and among species, and the relationship among oak species and their hybrids were analyzed, utilizing an ANOVA and a canonical analysis using morphoJ software. (3) Results: using the geometric morphometry analysis, we observed that Q. afares shape is intermediate between Q. suber and Q. canariensis, being Q. ilex very different from the others, and that there is no overlap among them. Putative hybrids are morphologically close to Q. afares and, to a lesser extent, to Q. suber and, finally, to Q. ilex and Q. canariensis. (4) Conclusions: the study opens the field for future molecular characterization of hybrids, and for determining their role in terms of adaptation to actual and predicted future climatic conditions. The morphological proximity of hybrids to Q. afares demonstrate this species advantage in the area of study and its importance for the future evolution of the species in the Mediterranean.

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Urbieta, Itziar R., Ignacio M. Pérez-Ramos, Miguel A. Zavala, Teodoro Marañón, and Richard K. Kobe. "Soil water content and emergence time control seedling establishment in three co-occurring Mediterranean oak species." Canadian Journal of Forest Research 38, no. 9 (September 2008): 2382–93. http://dx.doi.org/10.1139/x08-089.

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Tree species can differ in their responses to resource availability during the critical phase of establishment, which could influence forest dynamics. In Mediterranean forests, most of the attention has focused on the effects of shade and summer drought on seedling survival, but little is known about the effect of autumn to spring rains on earlier stages of recruitment. A sowing experiment was set up along natural light and water gradients with three co-occurring oak species ( Quercus suber L. (cork oak), Quercus canariensis Willd. (Algerian oak), and Quercus pyrenaica Willd. (Pyrenean oak)) that show limited natural regeneration in southern Spain. Recruitment stages were monitored for 1 year. Models of seed germination, seedling emergence, and seedling survival as well as of overall recruitment patterns were developed as functions of light, soil moisture, and soil compaction. The influence of intraspecific variation in seed mass and emergence time were also tested. Excess soil water levels during the winter reduced germination and emergence and lengthened time to emergence (in waterlogged open areas), which in turn decreased seedling survival during the dry season. Seedlings from larger seeds were more likely to germinate and emerge. The results suggest that temporal and spatial variability of soil water content, mediated by emergence time and seed size, play a crucial role in the regeneration dynamics of Mediterranean oak forests.

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Meddour-Sahar, O., R. Meddour, V. Leone, R. Lovreglio, and A. Derridj. "Analysis of forest fires causes and their motivations in northern Algeria: the Delphi method." iForest - Biogeosciences and Forestry 6, no. 5 (October 1, 2013): 247–54. http://dx.doi.org/10.3832/ifor0098-006.

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Khallef, Boubaker, and Rabah Zennir. "Forest cover change detection using Normalized Difference Vegetation Index in the Oued Bouhamdane watershed, Algeria - A case study." Journal of Forest Science 69, no. 6 (June 30, 2023): 254–65. http://dx.doi.org/10.17221/192/2022-jfs.

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Ouldammar , H. and Houha , B. "Hydrochemical Characterization of Gareat-El-Tarf Plain Groundwaters, Northeastern, Algeria." Journal of New Technology and Materials 9, no. 1 (June 2019): 53–57. http://dx.doi.org/10.12816/0056115.

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Ghalem, Amina, Inês Barbosa, Rachid Tarik Bouhraoua, and Augusta Costa. "Climate Signal in Cork-Ring Chronologies: Case Studies in Southwestern Portugal and Northwestern Algeria." Tree-Ring Research 74, no. 1 (January 2018): 15–27. http://dx.doi.org/10.3959/1536-1098-74.1.15.

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Rabhi, Nour El Houda, Hafsa Cherif-Silini, Allaoua Silini, Faizah N. Alenezi, Ali Chenari Bouket, Tomasz Oszako, and Lassaȃd Belbahri. "Alleviation of Salt Stress via Habitat-Adapted Symbiosis." Forests 13, no. 4 (April 8, 2022): 586. http://dx.doi.org/10.3390/f13040586.

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Halotolerant plant-growth-promoting rhizobacteria (PGPR) could not only promote plant growth, but also help in counteracting the detrimental effects of salt stress. In the present study, a total of 76 bacteria were isolated from the rhizosphere, non-rhizospheric soil and endophytes of the halophyte Salsola tetrandra, collected from natural saline soils in Algeria. Phylogenetic analysis based on the 16S rDNA sequence of Gram-negative bacteria (n = 51) identified, showed seventeen representative isolates grouped into four genera (Pseudomonas, Acinetobacter, Enterobacter, and Providencia). These bacterial isolates that exhibited different PGPR traits were selected and tested for their ability to tolerate different abiotic stress (NaCl, PEG8000, and pH). The majority of isolates were drought tolerant (60% of PEG8000) and had an optimal growth at high pH values (pH 9 and 11) and some strains tolerated 2 M of NaCl. Strains identified as Enterobacter xiangfangensis BE1, Providencia rettgeri BR5 and Pseudomonas stutzeri MLR6 showed high capacity of adaptation on their PGP traits. The salt-tolerant isolates were finally chosen to promote growth and enhance salt tolerance, separately or combined, of Arabidopsis thaliana (Col-0) exposed or not to 0.1 M NaCl, by following fresh and root weight, primary root elongation and lateral root number. The best bacterial effect was recorded for the MLR6 strain in increasing shoot fresh weight and for BE1 in terms of root fresh weight in the absence of salt stress. At stressed conditions, all growth parameters declined. However, inoculation of Arabidopsis thaliana with the three bacterial strains (MLR6, BE1 and BR5), single or in co-culture, conferred an increase in the shoot weight, primary root length and lateral root number. The use of these strains separately or combined as biofertilizers seems to be a powerful tool in the development of sustainable agriculture in saline soils.

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Adjoud-Sadadou, Djamila, and Rosa Halli-Hargas. "Dual mycorrhizal symbiosis: an asset for eucalypts out of Australia?" Canadian Journal of Forest Research 47, no. 4 (April 2017): 500–505. http://dx.doi.org/10.1139/cjfr-2016-0292.

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The dual symbiotic habit of the genus Eucalyptus is well documented: while arbuscular mycorrhizae are always dominant in seedlings and young trees, they are replaced by ectomycorrhizae in older trees. Here, the mycorrhizal status of eucalypts of different ages was assessed over the year in three plantations in the humid Mediterranean climate zone of Algeria (using morphological, anatomical, and histological criteria) and quantified in the dry and wet seasons over three years (using the grid-line intersect method of Giovannetti and Mosse (1980, New Phytol. 84: 489–500, doi: 10.1111/j.1469-8137.1980.tb04556.x ) on randomized fine root segments). Unexpectedly, the results revealed the persistence of arbuscular mycorrhizae in old trees and their dominance over ectomycorrhizae during the dry season, while the opposite pattern was observed in the wet season. Composite mycorrhizae displaying intimately mixed arbuscular mycorrhizae and ectomycorrhizae anatomical structures also occurred and were more frequent during the dry season. Eucalypts were clearly able to form a wide diversity of symbiotic associations with arbuscular mycorrhizal and ectomycorrhizal fungi locally associated with native trees, shrubs, and herbaceous plants. Therefore, the mycorrhizal status should not be a limiting factor to the silviculture of eucalypts in this area of Algeria because the dual symbiotic habit provides complementary benefits in a poor soil and in an alien environment.

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Mostari, Abbassia, Kheloufi Benabdeli, and Tahar Ferah. "Assessment of the impact of urbanisation on agricultural and forest areas in the coastal zone of Mostaganem (western Algeria)." Ekológia (Bratislava) 40, no. 3 (September 1, 2021): 230–39. http://dx.doi.org/10.2478/eko-2021-0025.

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Abstract The accelerated and uncontrolled urbanisation in the coastal zone of Mostaganem is exclusively at the expense of agricultural and natural areas and is reflected in the aggravation of their degradation. The study area is a 62-km-long littoral to the west of Mostaganem and includes 11 municipalities. The Corine Land Cover nomenclature was used by exploiting data from Landsat satellite images over a 30-year period. The exploitation of statistics related to agricultural and forestry areas reveals a worrying dynamics. All spaces are under pressure mainly due to urbanisation. The phenomena of urbanization and coastalisation and the development of seaside tourism have increased the pressures on natural heritage to the point of compromising it. The analysis identified seven thematic object classes for the study area. An assessment of the dynamics of urban, forest and agricultural areas is an informative indicator of the sustainability of natural areas in the coastline of Mostaganem. The cultivated areas measured from 42,356 ha in 1985 to 38,301 ha in 2015,forest formations from 8207 ha to 9298 ha and urbanised areas from 2604 ha to 5049 ha. The dramatic land use change stimulated by rapid urbanisation in the study areas has resulted in a fundamental change in the landscape pattern. The thematic maps and the results obtained through different periods show that the predominant agricultural landscape has been gradually converted into urban areas.

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BOUALEM, ABDELKADER. "Estimation of crop water requirement of tomato in Algeria using CROPWAT model." Journal of Agrometeorology 25, no. 4 (November 30, 2023): 613–15. http://dx.doi.org/10.54386/jam.v25i4.2376.

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Slimani, Said. "Tree-ring reconstruction of March-June precipitation from the Atlas cedar forest of Mount Takoucht, Béjaïa (northern Algeria)." Forest Systems 30, no. 3 (December 2021): e011-e011. http://dx.doi.org/10.5424/fs/2021303-18111.

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Aim of study: A March-June precipitation has been reconstructed for the period 1830-2015 using Atlas cedar (Cedrus atlantica Manetti) tree-ring records. Area of study: Atlas cedar forest of Mount Takoucht (Béjaïa, northern Algeria). Material and methods: Seasonal correlations were computed in order to identify the best period of the year for the climate reconstruction. The temporal stability of the tree-ring signal for precipitation was checked using the split-sample calibration-verification procedure. The reconstruction was performed using the transfer function method. Main results: The reconstructed data revealed high interannual to decadal variation in late winter to early summer precipitation. Wet conditions dominated during the 1830s and 1840s and were followed by sustained dry conditions during the mid-19th century, which registered two of the most severe droughts (1858 and 1869) over the period of reconstruction. Relatively moderate climate conditions marked the late 19th and early 20th centuries. A gradual return towards drier conditions was observed from the 1920s and reached high frequencies of drought around mid-20th century. After an exceptional prolonged wet period of 24 years (1966-1989), the reconstruction registered its highest frequency in extreme dry/wet events: the decade 1993-2002 recorded the highest drought frequency of the reconstruction, with the third most severe dry event (1999), while the last years were marked by a clear shift toward wet conditions. Research highlights: These findings provide relevant records on past climate variability in one of the rainiest areas in Algeria and constitute valuable knowledge for specific drought and wet periods monitoring in the region.

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Mokni, Ridha El. "Echinophora spinosa L. (Apiaceae), a new species in the flora of Tunisia and second report from North Africa." Hacquetia 19, no. 1 (June 1, 2020): 137–42. http://dx.doi.org/10.2478/hacq-2019-0016.

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AbstractEchinophora spinosa L., a perennial member of the Apiaceae (Umbelliferae) family is known to be native to southern Europe and Algeria. More recently this taxon was collected from Tabarka (Jendouba-Kroumiria, North-Western of Tunisia) and is reported as a new species for the terrestrial flora of Tunisia. It is described and illustrated and notes on its ecology and phytosociological remarks are provided.

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Tebani, Mohamed, and Khalladi Mederbal. "Monitoring and Evaluation of the Agricultural and Rural Renewal Program in Algeria: case of the Ouarsenis area." Revista de Economia e Sociologia Rural 56, no. 4 (October 2018): 719–28. http://dx.doi.org/10.1590/1234-56781806-94790560410.

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Abstract: In Algeria, agriculture continues to suffer from short-term strategies and is unsuitable for the needs of populations and rural areas. This study examines the evaluation of the Agricultural and Rural Program (ARRP) initiated in Algeria for the period (2009-2014). This work was carried in the Ouarsenis area located in the north-west of the country. It is based on regular monitoring on the ground of the rate of achievement of the targets foreseen. We concentrated our efforts on the projects financed by the main intervention funds of this program. The results achieved are far from the targets for the economic component, a situation mainly expressed by the low income of the rural population and the number of jobs created. However, an improvement in the living conditions of the population was recorded in the social component. Concerning the environmental aspect, the results are considered acceptable for the restoration of the forest patrimony and low for the protection of the soil. We believe that this policy rests on foundations that have not really been translated into the field in the continuity of previous approaches and lack of governance with poorly managed material, financial and human resources.

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Benmoussa , Amel, Sedrati , Abdenour, Belkoum , Noureddine, Houha , Belgacem, and Darbouche , Abdelhak. "Chemical and Isotopic Characterization of the Thermal Waters of Hammam Skhouna Algeria." Journal of New Technology and Materials 8, no. 2 (December 2018): 94–99. http://dx.doi.org/10.12816/0053511.

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Mokni, Ridha El. "Muscari baeticum (Scilloideae, Asparagaceae), a new addition to the native flora of Tunisia and third report to Mediterranean Africa." Hacquetia 21, no. 2 (July 9, 2022): 355–60. http://dx.doi.org/10.2478/hacq-2022-0002.

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Abstract Muscari baeticum, originating from western Europe, is here recorded as new from the central eastern part of Tunisia. So far, it was known only from Algeria and Morocco within the southern part of the Mediterranean basin. Description of the species as well as first data about its ecology in Tunisia together with geographical distribution and diagnostic features of closely related species are given. Photographic illustrations of the new reported taxon and an updated key to the Muscari species in North Africa are also provided.

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Abi-Ayad, Fatima Zahra, Meryem Abi-Ayad, Hammadi A. Lazouni, and Sid Ahmed Rebiahi. "Evaluation of Tetraclinis articulata essential oil from Algeria flora as a potential source of antifungal activity and study of its chemical composition." Journal of the Indian Academy of Wood Science 10, no. 1 (March 8, 2013): 9–15. http://dx.doi.org/10.1007/s13196-013-0086-7.

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Hanene, Zouaidia, Mezedjri Lyamine, De Belair Gerard, and Tahar Ali. "Phyto-Ecologic Survey of a Complex of Temporary Pools Gauthier Pools (North East Algeria)." Research Journal of Botany 3, no. 2 (June 15, 2008): 65–75. http://dx.doi.org/10.3923/rjb.2008.65.75.

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Corominas, Gabriel Mercadal i. "Geobotanical characterisation of the Trifolion squamosi nom. corr. alliance (class. Juncetea maritimi) in Catalonia and the Western Mediterranean." Hacquetia 20, no. 1 (March 1, 2021): 107–17. http://dx.doi.org/10.2478/hacq-2020-0019.

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Abstract We present a summary of part of the phytogeographic results described in the author’s PhD thesis. In this case, we characterise and validate several syntaxa of subsaline meadows in the Trifolion squamosi nom. corr. alliance (class. Juncetea maritimi) in Catalonia (incl. NE Spain and SE France) and in other regions of the Western Mediterranean (N Algeria, Languedoc and Provence). In total, we study six syntaxa in geobotanical terms, based on synthetic tables and factor analyses of correspondence published previously in the thesis: one alliance (Trifolion squamosi), two associations and three subassociations (Agropyro-Trifolietum subass. typicum, subass. festucetosum comb. nova, subass. brachypodietosum nova; Festucetum arundinaceae).

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Lamara, Asma, Zine El Abidine Fellahi, Abderrahmane Hannachi, and Ramdane Benniou. "Assessing the phenotypic variation, heritability and genetic advance in bread wheat (Triticum aestivum L.) candidate lines grown under rainfed semi-arid region of Algeria." Revista Facultad Nacional de Agronomía Medellín 75, no. 3 (September 1, 2022): 10107–18. http://dx.doi.org/10.15446/rfnam.v75n3.100638.

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The genetic improvement of any breeding population largely depends upon the magnitude of genetic variability present. This study was carried out to estimate parameters of the genetic variation among 13 quantitative traits of bread wheat evaluated at INRAA-Setif institute (Algeria) during the 2020–2021 crop season in a rainfed environment. 34 genotypes including four control checks were planted in a randomized complete block design with three replications. Genotypes showed significant variations for almost all the studied traits. Proline content, spikes weight, and grain yield exhibited a high genotypic coefficient of variation along with moderate to high heritability coupled with a high genetic gain, suggesting the implication of additive gene action. The number of spikes, spikes weight, and thousand kernel weight were significantly and positively correlated with grain yield at both phenotypic and genotypic levels. Path analysis results showed that spikes weight is an important route through which most of the measured traits influenced indirectly grain yield. Lines L1, L20, L28, L16, and L18 exhibited a sizeable grain yield advantage, which suggests they are potential candidates for future release and could be incorporated into the wheat breeding programs as parents to improve yield in the rainfed environments of Algeria

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Taleb, Mohamed lamine, Habib Ouabel, Ahmed Haddad, Mohamed Larid, and M'hamed Maatoug. "Density effect on decline of Cedrus atlantica Manetti Ex Carriere in national park of Theniet El Had, Algeria." South Asian Journal of Experimental Biology 12, no. 3 (June 6, 2022): 438–44. http://dx.doi.org/10.38150/sajeb.12(3).p438-444.

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This study focuses on the study of the causal factors of Atlas cedar decline in the Theniet el Had national park, once classified as the first park in Algeria and the most beautiful cedar forest in northern Africa. Although severalstudies have been done on the causative agent of decline, none of them have confirmed the predisposing factors, thus weakening its vigor. Therefore, in this study, the search for possible relationship between dieback and ecological, dendrometric characteristics as well as the spatial distribution of trees were taken into consideration. 40 concentric circular plots of 200, 400, 500 and 1,000 m² were installed in the northern part of the park for dendrometric and edaphic surveys, in addition to rectangular plots of 200 m2 installed in the center of the concentric plots were measured of distance between trees and of the four radii of the crown. The results obtained showed that the circumference in the reduced areas (the circular plots of 200m²) declined significantly. The spatial distribution of the trees, schematized by the AutoCAD software, was chaotic and the crowns showed deterioration influenced by their overlapping. In 76% of the rectangular plots, the maximum area of the crowns had an overlap of more than 90%. The application of Schütz's inter-individual competition index also indicated that competition between trees was very important. This situation only explains the chaotic distribution of the trees, due to the lack of forestry work, imposes a competition between the trees causing, thus, the weakening of their vigor. Therefore, the establishment of a short- and longterm Atlas cedar decline management plan is of high recommended importance, in which adjusting the spatial distribution can promote the future strength and vitality of Atlas cedars.

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Journal articles on the topic 'Forests and forestry – algeria'

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