Journal articles on the topic 'Reforestation – 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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Khadidja, Daoudi, and Sitayeb Tayeb. "Effects of Land Use Changes on the Soil Physicochemical Properties in South-Western Algeria." Ekológia (Bratislava) 39, no. 3 (September 1, 2020): 224–35. http://dx.doi.org/10.2478/eko-2020-0017.
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AbstractThis study shows the impact of the reforestation program by some tree species (Pinus halepensis, Cupressus sempervirens and Eucalyptus camaldulensis) on the soil physicochemical parameters in south-western Algeria steppe. The study was realized on soil samples from the Touadjeur site. One hundred soil samples were taken from the field, followed by physicochemical analyses in the laboratory. A comparison of the soil elements between reforested and unreforested sites considered as a control was carried out. The results show that there are differences in the physicochemical parameters of the soil between the reforestation and the non-reforestation ones constituted by a steppe vegetation. The ANOVA one way test shows a highly significant difference change in soil physical parameters, moisture, holding capacity and saturated hydraulic conductivity, but no change in apparent density, actual density and color. Also, from a chemical point of view, the differences concern the organic matter, organic carbon, pH and certain soil contents. The main differences in soil properties between the reforestation sites and the control site, reflect the consequences of forest management adopted by the forest services, most probably the choice of reforestation species.
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Ford, Caroline. "Reforestation, Landscape Conservation, and the Anxieties of Empire in French Colonial Algeria." American Historical Review 113, no. 2 (April 2008): 341–62. http://dx.doi.org/10.1086/ahr.113.2.341.
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Zaid Bouchou Lynda, Gachi Mustapha, and Chakali Gahdab. "Fecundity of The Pine Processionary, Thaumetopoea Pityocampa (Denis & Schiffermüller, 1775) In The Case Of Reforestation In Moudjbara (Djelfa - Algeria)." Journal of Advanced Zoology 44, no. 4 (November 25, 2023): 625–36. http://dx.doi.org/10.17762/jaz.v44i4.2132.
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A study of the fecundity of female populations of the pine processionary in the Moudjbara reforestation indicates that there are cyclical variations in the reproduction of this species. Descriptive analysis of pine processionary oviposition lengths showed greater significance for oviposition deposited on needles than for oviposition deposited on twigs. A very highly significant difference was noted between the lengths of the egg-laying supports from the Moudjbara reforestation (p=0.0001). The 195 pine processionary oviposition sites revealed a total of 37,272 eggs, with an average of 191 eggs per oviposition site. Analysis of the variance between the various categories of eggs showed a highly significant probability (p=0.0001). Three parasitoids were identified that emerged from oviposits collected at the Moudjbara reforestation site, with rates varying from year to year. T. embryophagum was encountered only sporadically in 2018, 2019 and 2021, with respective percentages not exceeding 2%. For the four pine processionary caterpillar populations studied, B. servadeii appeared to be more abundant than O. pityocampae. The number of B. servadeii adults observed reached 83.91% in 2020. Parasitoid activity was greater on eggs located at the ends of the clutch. It also appears that O. pityocampae mainly parasitizes the upper part of the egg, whereas B. servadeii shows a preference for the lower part.
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Djebbouri, Mohammed, Mohamed Zouidi, Mohamed Terras, and Abdelaziz Merghadi. "Predicting suitable habitats of the major forest trees in the Saïda region (Algeria): A reliable reforestation tool." Ekológia (Bratislava) 41, no. 3 (September 1, 2022): 236–46. http://dx.doi.org/10.2478/eko-2022-0024.
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Abstract Modeling potential habitat for plant species is an appropriate approach to maintain biodiversity, developing proper reforestation campaigns, and rehabilitating ecosystems. In this study, we investigated the potential distributions of four forest species, namely, Quercus faginea Lam.; Q. ilex L.; Tetraclinis articulata (Vahl) Mast.; and Pistacia atlantica Desf. In the north-western Algeria at Saïda region. The MAXENT method was used to model the habitats of these species using topographic data as predictive variables at a resolution of 100 m. Moreover, the model evaluation process was achieved using the area under the operating characteristic curve of the receiver (AUC) and Jackknife test. The generated models were found to be accurate. AUC results are ranging between 0.98 and 0.91 for the training set and 0.87 and 0.97 for the testing set. The results of the distribution probability of this study provide a useful tool for the local decision-makers of reforestation campaigns.
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Benhizia, Ramzi, Yacine Kouba, György Szabó, Gábor Négyesi, and Behnam Ata. "Monitoring the Spatiotemporal Evolution of the Green Dam in Djelfa Province, Algeria." Sustainability 13, no. 14 (July 16, 2021): 7953. http://dx.doi.org/10.3390/su13147953.
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Green walls and green dams are increasingly being considered as part of many national and international desertification initiatives. This paper studies the spatiotemporal evolution of the green dam in the Moudjbara region (Djelfa Province, Algeria), from 1972 to 2019, by using Landsat imagery, Land Change Modeler, and OpenLand package. The future evolution of pine plantations, for the year 2029, was also forecasted, based on an anthropogenic scenario (i.e., anthropogenic pressure is the main driver of the green dam destruction). Our findings revealed that the green dam project was successful for a few years, but, after that, pine plantations deteriorated significantly, due to forest harvesting, livestock overgrazing, and the proliferation of the pine caterpillar processionary, which destroyed most of the reforestation. Land change modeler predicted a huge degradation of pine plantations for the year 2029, and if the deforestation continues at the same rate, the green dam in the Moudjbara region will disappear during the next few decades. Being aware of this threat, the Algerian authorities are now planning to reforest more than 1.2 million ha under the latest rural renewal policy, by introducing new principles related to sustainable development, fighting desertification, and climate change adaptation. We strongly recommend moving away from the singular tree planting focus, to diversifying desertification control methods.
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Hassen, Benfetta, and Ouadja Abid. "Surface water leakage, sedimentation and evaporation in arid regions: A case study of the Gargar dam, Algeria." Journal of Water and Land Development 35, no. 1 (December 1, 2017): 73–81. http://dx.doi.org/10.1515/jwld-2017-0070.
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AbstractThis study was carried out in order to assess the total capacity loss in Gargar dam, third-largest in Algeria, due to the mudding of the reservoir, intense evaporation and water leaks. We analysed the variation in leakage as a function of the reservoir level, and quantify losses due to leaks, sedimentation and evaporation. We relied on site visits and data obtained from the Algerian Agency for Dams and Transfers to assess the leakage volume; reservoir level; sedimentation and evaporation levels for the period 1988–2015. We present an updated report of this problem through the dam. We estimated total average losses of 23 million m3·year−1 for the period 1988–2015, made up of leakage (0.3 million m3·year−1), evaporation (18 million m3·year−1) and dead storage for 4.6 million m3·year−1. However, total losses for 2004 were estimated at 113.9 million m3, which increased to the alarming value of 166.8 million m3 in 2015. We suggest improving the waterproofness by a concrete screen, and reducing mudding and evaporation by reforestation, to increase the storage capacity of the dam.
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Dib, Tassadit, Dimitrios Kazanis, Margarita Arianoutsou, Mahand Messaoudene, and Fazia Krouchi. "Post-fire regeneration of cork oak (Quercus suber) in Kiadi forest (Akfadou- Algeria)." Mediterranean Botany Online first (September 19, 2022): 1–14. http://dx.doi.org/10.5209/mbot.77999.
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Cork oak (Quercus suber) as a West Mediterranean species is known for its ecological, economic and social values. Wildfires are one of the most serious problems threatening Quercus suber, endangering its occurrence in its area of distribution. Therefore, knowing the behavior of the species after fire and the factors influencing its responses are particularly important for forest management. In this study we assessed the post fire vegetative recovery in 730 trees affected by wildfires on 2014 in Kiadi cork oak forest, located in the Western side of Akfadou Mountains in Algeria. Few months after the fire, individual tree mortality was very low (7.53%), and nearly, all the trees sampled survived the fire since almost all trees resprouted from canopy and some of them showed basal resprouts. Moreover, those two modes of post fire vegetative recovery were not correlated to each other. The performed redundancy analyzes (RDA) revealed that the cork oak post-fire response was highly correlated with individual characteristics and with the environmental data. The main variables influencing the likelihood of good or poor vegetative recovery were the understory height and cover, soil characteristics, fire severity, tree status (alive/dead trees), tree diameter and tree exploitation. Our results confirmed the fire resistance of cork oak species; which is also the only Algerian tree to resprouts. Hence, this makes the species a good candidate for reforestation programs in fire prone ecosystems.
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Kheloufi, Abdenour, and Lahouaria Mounia Mansouri. "Effect of seawater irrigation on germination and seedling growth of Carob tree (Ceratonia siliqua L.) from Gouraya National park (Béjaïa, Algeria)." Reforesta, no. 10 (December 30, 2020): 1–10. http://dx.doi.org/10.21750/refor.10.01.84.
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The carob tree (Ceratonia siliqua L.) is an important component of the Mediterranean vegetation and its cultivation is important environmentally and economically. It is also an interesting leguminous species for afforestation-reforestation. In this study, carob seeds collected in a representative area of the Mediterranean basin at the national park of Gouraya (Béjaïa, Algeria), were subjected to germination tests under Mediterranean seawater (SW) irrigation of different concentrations (0, 10, 30, 50 and 100% SW) for 15-day period. Before germination tests, a 20 min pre-treatment with 96% sulphuric acid was necessary to overcome seed coat dormancy which does not permit germination. Results showed that the seeds of C. siliqua were able to germinate at different seawater concentration, except for 50% SW and 100% SW which resulted in total inhibition of germination. The maximum number of C. siliqua seed germination of 100% FGP (final germination percentage) appeared at 0% SW and 10% SW. Only 35.5% of the seeds have germinated in 30% SW. Ungerminated seeds of C. siliqua from different SW treatments showed medium germination recovery (FGPRecov) of 39.9% at 50% SW and low recovery of 18.2% at 100% SW when transferred to distilled water after 15 day-period. Seedlings length and seedling fresh and dry weight were significantly (P<0.001) decreased with increasing SW concentrations. Seedling water content remained constant in 10% SW in comparison with the control, while it decreased very slightly in 30% SW. These findings may serve as useful information for C. siliqua habitat establishment and afforestation-reforestation programs in coastal sites and for exploiting seawater in the area.
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Mokhtari, El Hadj, Boualem Remini, and Saad Abdelamir Hamoudi. "Modelling of the rain–flow by hydrological modelling software system HEC-HMS – watershed’s case of wadi Cheliff-Ghrib, Algeria." Journal of Water and Land Development 30, no. 1 (September 1, 2016): 87–100. http://dx.doi.org/10.1515/jwld-2016-0025.
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Abstract The purpose of this study is to make a hydrologic modelling type of rain–flow on watershed of wadi Cheliff-Ghrib, by means of HEC-HMS model. Afterwards, this model is used to predict hydrologic response of the basin to the climate changes scenarios and land use. The model calibration was made in two phases; the first one is to select events, formalism of transfer function and appropriate NRCS downpour. The second is to deduce optimised parameters set which is used in validation. By using optimised parameters set, we were able to predict impact of quantiles downpours, changes in land use due to urbanisation, deforestation and reforestation on the peak flow and on runoff volume. Towards the end, we reconfirmed that influence of land use decreases for extreme storms.
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Zerey, Wael El, Mamfoumby Gael, and Asma EL Zerey-Belaskri. "Monitoring Land Use Change and Vegetation Dynamics by Remote Sensing in the Steppe Region of Sidi Bel Abbes (Northwest, Algeria)." International Journal of Environment 6, no. 3 (August 24, 2017): 71–81. http://dx.doi.org/10.3126/ije.v6i3.18098.
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The application of remote sensing in land cover changes monitoring is a very efficient tool, for landscape management in arid regions. To assess the spatial-temporal dynamics, of egetation, in the southern region of Sidi Bel Abbes, for the period (2001- 2014), Landsat and MODIS NDVI data were processed and analysed using remote sensing software. The obtained results, confirm that the steppe region is highly degraded in the south and in the south-east, with light progression of vegetation noticed in the north and the north-west of the study area. The increase of vegetation cover is related to the reforestation actions, engaged by the forest services. For decision makers, the use of satellite imagery can improve the strategic conservation and management plans of the steppe ecosystem.International Journal of EnvironmentVolume-6, Issue-3, Jun-Aug 2017, Page:71-81
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Bouragba, N., M. Bouragba, A. Djouklafi, S. Amraoui, A. Brague, and L. Beladjal. "Spider (Araneae) and Beetle (Coleoptera) Communities Structure in the North African Streamside Zone (Zahrez Gharbi, Djelfa, Algeria) After Reforestation." African Entomology 28, no. 1 (June 4, 2020): 25. http://dx.doi.org/10.4001/003.028.0025.
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Gadoum, Abdelkader, Mohamed Chahbar, Ahmed Adda, Mohamed Sahnoune, and Fatiha Aid. "Morphometrical Variation of Carob tree (Ceratoniasiliqua L) in Algeria." GABJ 5, no. 2 (May 15, 2021): 103–15. http://dx.doi.org/10.46325/gabj.v5i2.77.
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Mediterranean ecosystems are subject to the influence of particular climatic conditions characterized by scarcity or irregular rainfall and long dry summer periods. These climatic restrictions generally disturb the vegetation. In order to overcome these problems. The use of pioneer tree species, adapted to climatic hazards, remains the most recommended solution. The carob tree (C.siliqua) is an agro-sylvo-pastoral species with enormous socio-economic and ecological interests. This Mediterranean tree is favourably established in semi-arid and arid areas. For the success of reforestation projects, the management and preservation of this species requires prior assessment and characterization of their variability. This approach is based on multidisciplinary studies involving the analysis of the diversity of agro-morphological, adaptive traits. In this context, the present study aims to explore, using agro-morpho-metric markers of the carob tree in central and north-western Algeria. We use the pods and leaves to identify, label or characterize the different collections or germplasm of the carob tree in the world. This study was carried out on the variability of nine morpho-metric traits related to fruits (pods) and leaves through a comparative study at the level of provenances (Larabaa, BordjBounaama, Aflou, Remchi and Ain Sefra). Carob plants from three contrasting ecotypes of Ceratoniasiliqua (Remchi ecotype from the sub-humid stage, Tissemsilt and BordjBounaama ecotype from the semi-arid stage and Ain Sefra and Aflou ecotype from the arid stage) were subjected to a thorough biometric study of the leaves and pods collected after a field survey in June-July 2013. The results showed the highest mean values for the majority of the traits studied, thus indicating the importance of the provenance factor. Based on the analyses of variance and their decomposition, and depending on the biometric traits studied, the carob resource management strategy can be chosen either for the pod factor (pod weight, pod length, number of seeds per pod and number of infested seeds per pod) or the leaf factor (petiole length and leaf area). In the case of our collections, the longest size was recorded in the Bordj Bounaama population (16.66 cm ± 2.36) and Remchi (16.10 cm ± 2.78) and the smallest in the Aflou population (9.40 cm ± 1, 27). Indeed, a positive correlation between the measured parameters (length, width, thickness and weight of the pod) was observed. Differences between ecotypes were observed for all morphological traits studied.
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Naggar, Oumeldjilali, and Mohamed Zedek. "An Eco-Dendrometric Study of Atlas Cedar (Cedrus Altantica Manetti) from Theniet-El-Had National Park (North West of Algeria)." Revista de Gestão Social e Ambiental 18, no. 9 (April 26, 2024): e05914. http://dx.doi.org/10.24857/rgsa.v18n9-017.
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Purpose: This work contributes to the study of the growth pattern of Atlas Cedar (characterized by dendrometric variables) relevant to the stands from Pepinière canton in relation to site factors (ecological and pedology descriptors). Theoretical framework: A forest ecosystem is a complex set of external factors that have a positive or negative effect on tree growth. Species ecology is a key point in understanding their behavior in relation to environmental fluctuations. Method: Forty-six temporary plots were set up to collect ecological, pedological, and dendrometric data, allowing for a characterization of the growth pattern of Atlas Cedar stands. Results and conclusion: The study highlights the presence of an unmanaged irregular forest. Despite being located in an environment conducive to its growth, this forest is subject to degrading anthropogenic activity. Analysis of variance at a significance level of 95% shows that altitude and limestone content are the main site factors influencing Atlas Cedar growth. Research implications: knowledge of the growth rate of this species allows better silvicultural operations, and application of more adequate management plans for this endemic protected species. Originality/value: This study constitutes a reliable scientific tool for forest managers, particularly in national reforestation plans, which are doomed to failure due to a lack of knowledge of the behavior of the species used.
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Samira, Mebkhouti, Hasnaoui Okkacha, Medjati Nadjat, Brahimi Naima, Benabadji Noury, and Ammam Abdelkader. "Climo-edaphic impact on the growth of Aleppo pine (Pinus halepensis Mill.) in the reforestation of the Naâma region (South-West Algeria)." South Asian Journal of Experimental Biology 9, no. 3 (October 10, 2019): 87–94. http://dx.doi.org/10.38150/sajeb.9(3).p87-94.
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Pinus halepensis Mill. (Aleppo pine) is a forest species. Since the 1970s thisspecies has been used in the reforestation of Naâma region (South-WestAlgeria) for the restoration of supposedly degraded lands and to fight againstsilting. Our study focused on the growth of this taxon and some environmental descriptors. Climatic analyses classify the study area in the arid bioclimatic stage. A clear setback of the selected stations was observed on theEmberger diagrams, and this consequently allowed us to deduce the accentuation of the pejorative effects of climate on the dynamics of the vegetationcover in place, and that P. halepensis can develop in arid climates. The results of the physicochemical analyses of the studied soils revealed silt-sandyand sandy-loam textures, with a pH ranging from 7.1 to 8.08. The measurement of the electrical conductivity allowed deducing that the soils of thestudied stations were unsalted. The total carbonate content was high; thishigh grade was related to the nature of the bedrock, which is often limestone. The recorded values of the organic matter were low and ranged from0.3% to 1.7%. The average heights of the trees sampled in the reference stations were very contrasting; they generally oscillated between 2.3 and 16.4m. The CPA based statistical combinations highlighted the importance of thesoil depth and that of the texture on P. halepensis growth. Despite an aridclimate (low rainfall, high temperature) and poor and shallow soils, Pinushalepensis stands can develop in pre-steppe areas. This species has a remarkable ecological plasticity and is resistant to changes in the region ofNaâma (south-west Algeria).
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Kholkhal, Djamel, and Benamar Benmahioul. "Effects of substrate on the germination and seedling growth of Quercus suber L." Biodiversity Research and Conservation 64, no. 1 (December 1, 2021): 7–14. http://dx.doi.org/10.2478/biorc-2021-0008.
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Abstract The seedling quality is one of the most important factors for the success of reforestation programs. In this sense, this work aimed to evaluate the effects of substrate on the germination of cork oak acorns from El Aouana forest, located in the Jijel region of north-eastern Algeria, and on the performance of seedlings, particularly their growth. The experiment was performed in the nursery of the Tlemcen Forest Conservation. For this purpose, five substrates were used: S1 (sand), S2 (topsoil), S3 (potting soil), S4 (1/2 sand + 1/2 topsoil) and S5 (1/3 sand + 1/3 topsoil + 1/3 potting soil). Germination and survival rates, and seedling morphological traits: average height of seedlings, average root collar diameter, stem height/root collar diameter ratio (H/D), average number of leaves per plant, leaf length, leaf width and leaf area, were evaluated. Results obtained after 16 months of monitoring in the nursery showed high germination rates of 91.4%, with an average survival rate of 89.5%, and significant differences were recorded between the substrates tested. In terms of growth, the best results were obtained with the potting soil substrate (S3) for all parameters. The lowest yields were recorded in seedlings grown on sand alone (S1).
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Aissi, Abdeldjalil, Yassine Beghami, and Myriam Heuertz. "Le chêne faginé (Quercus faginea, Fagaceae) en Algérie : potentiel germinatif et variabilité morphologique des glands et des semis." Plant Ecology and Evolution 152, no. 3 (November 28, 2019): 437–49. http://dx.doi.org/10.5091/plecevo.2019.1553.
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The Portuguese Oak in Algeria (Quercus faginea, Fagaceae): germination potential and variability of acorn and seedling morphology
Background and aims – The Portuguese Oak, Quercus faginea Lam. (Fagaceae) forms part of iconic Mediterranean forest communities and is of great ecological and taxonomic value in Algeria. Unfortunately, the species is under threat and its populations remain poorly characterized. The aim of this paper is to study the variability of acorn morphology and germination potential of Q. faginea in Algeria, to examine variability in the growth of seedlings and to evaluate the influence of physical treatments on germination capacity and the subsequent development of seedlings at the intra- and inter-provenance levels.Methods – Mature acorns from four Q. faginea provenances of the species in Algeria were used for this work. In each provenance, ten trees were selected, and 100 acorns collected from each tree. Prior to germination, phenotypic seed traits were measured and a set of physical treatments was performed. The germinated seedlings were transplanted into polyethylene bags and several characteristics of plant growth were measured.Key results – The comparative analysis on acorn morphology and germination features revealed heavier acorns in the Baloul provenance and smaller and lighter leaves in the Chelia provenance, in comparison with other provenances. Germination features and seedling growth showed that the size of the acorns had no influence on seedling development.Conclusions – Our results show a morphological variability of leaves and acorns of the Portuguese Oak at the inter-provenance level. This diversity is probably a consequence of genetic variation and / or variable environmental conditions of the provenances. The study of the germination and seedling development reveals a considerable potential for germination and growth. Given all the factors that threaten the persistence of Portuguese Oak in Algeria, we recommend conservation action for the species through reforestation, ex situ plantations and protective fences to avoid genuine and irreversible population regression, which would most likely lead to its disappearance.
Contexte et buts visés – Le chêne faginé, Quercus faginea Lam. (Fagaceae), représente un intérêt patrimonial, écologique et taxonomique remarquable en Algérie, mais malheureusement l’espèce est menacée et peu étudiée. L’objectif de ce travail est d’étudier la variabilité morphologique et le potentiel germinatif des glands de Q. faginea en Algérie, d’examiner la variabilité de la croissance des semis et d’évaluer l’influence des traitements physiques sur le potentiel germinatif et le développement ultérieur des semis, tant au niveau intra- qu’inter-stationnel.Méthodes – Des glands mûrs de chêne faginé récoltés sur quatre stations de l’espèce en Algérie ont été utilisés. Sur chaque station, dix arbres ont été sélectionnés, représentés par 100 glands chacun. Une analyse de traits phénotypiques a été réalisée sur les glands ; ensuite un ensemble de traitements physiques ont été effectués afin de tester leur effet sur la germination. Les semis issus de la germination ont été transplantés dans des sachets en polyéthylène et plusieurs caractères de croissance ont été mesurés. Résultats-clés – L’étude comparative morphologique et germinative révèle des glands plus longs et plus lourds à la station de Baloul, et des feuilles plus petites et plus légères à la station de Chélia, en comparaison avec les autres stations. Un effet significatif des traitements sur la germination a été montré dans toutes les stations. La taille des glands n’a aucune influence sur le développement des jeunes semis.Conclusions – Nos résultats montrent une variabilité morphologique inter-stationnelle des feuilles et des glands du chêne faginé. Cette diversité est probablement la conséquence de variations génétiques et/ou des conditions environnementales des stations. L’étude de la germination et de l’évolution de plants révèle un potentiel germinatif et de croissance considérables. Compte tenu de l’ensemble des facteurs qui menacent la pérennité du chêne faginé en Algérie, nous recommandons des actions pour la conservation de l’espèce telles que des reboisements, des plantations ex situ et des clôtures de protection pour éviter une régression réelle et irréversible des peuplements qui conduirait très probablement à sa disparition.
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Lazreg, F., L. Belabid, J. Sanchez, E. Gallego, J. A. Garrido-Cardenas, and A. Elhaitoum. "First Report of Fusarium equiseti Causing Damping-Off Disease on Aleppo Pine in Algeria." Plant Disease 98, no. 9 (September 2014): 1268. http://dx.doi.org/10.1094/pdis-02-13-0194-pdn.
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The Aleppo pine (Pinus halepensis Mill.) is a conifer native to the Mediterranean region. In 2008 and 2009, a survey of Aleppo pine seedling diseases was performed in three forest nurseries from Relizane, Sidi Bel Abbes, and Tlemcen provinces in northwestern Algeria. Aleppo pine seedlings showed symptoms of pre- and post-emergence damping-off disease, with an incidence of 64 to 77%. Four composite samples were taken from each location. Disinfested root and root collar segments, approximately 5 mm in length, were cultured on potato dextrose agar (PDA) and incubated at 25°C, and hyphal tips were transferred to PDA. Fusarium equiseti (Corda) Sacc. (teleomorph: Gibberella intricans Wollenw.) was identified from roots of two seedlings from the Sidi Bel Abbes nursery. Morphological identification was done according to Fusarium keys (2). PDA colonies with abundant, loosely floccose, whitish aerial mycelium and beige pigmentation were observed. Macroconidia with usually 5 to 6 septa, 31 to 45 μm long. A pronounced dorsiventral curvature, tapered and elongated apical cell, and prominent foot shape were observed. Microconidia were absent. Chlamydospores were produced in hyphae, most often intercalary, solitary, in pairs, frequently forming chains or clusters, globose (7 to 13 μm). To confirm the identity of this fungus, the internal transcribed spacer of F3RS1 and F19RS1 isolates of F. equiseti were amplified and sequenced using ITS1 and ITS4 primers (4), GenBank accession nos. JX114784 and JX114791, respectively. Those sequences bore 100% (HQ671182) similarity with sequences of F. equiseti in GenBank. Pathogenicity tests were performed to fulfill Koch's postulates. Inoculum was produced by adding a 5-mm-diameter plug from a 7-day-old CMA petri dish culture to a previously sterilized 500 ml flask (237.5 g sand, 12.5 g cornmeal, 80 ml sterile distilled water), shaken over 9 days at 25°C, and mixed with sterile sandy clay soil at 1:3 (v:v). Infested soil was then transferred to 500 ml pots, and 10 Aleppo pine seeds were planted per pot. A completely randomized design was used with three replicates per isolate and three control pots with a similar non-infested soil. After 1 month at 25°C the two tested isolates caused typical damping-off symptoms (collar rot) on seedlings and were re-isolated from recently infected tissues. The percentages of the inoculated plants that became infected were 59 to 65% among isolates (0% in control pots). To our knowledge, infection by F. equiseti is a first report on Aleppo pine in northwestern Algeria, Northern Africa, and globally, and on conifers in the Mediterranean region (1,3). In Algeria, F. equiseti is associated with black pepper (Piper nigrum L.) (3). These findings highlight the moderate impact of F. equiseti on the production of Aleppo seedling stock for reforestation activities in northwestern Algeria. References: (1) D. F. Farr and A. Y. Rossman. Fungal Databases, Systematic Mycology and Microbiology Laboratory. ARS, USDA, Beltsville, MD. Retrieved from http://nt.ars-grin.gov/fungaldatabases/ , February 20, 2013. (2) J. F. Leslie and B. A. Summerell. The Fusarium Laboratory Manual. Blackwell Publishing, Ames, IA, 2006. (3) D. W. Minter. Cybertruffle's Robigalia, Observations of Fungi and their Associated Organisms. Retrieved from http://www.cybertruffle.org.uk/robigalia/eng/ , February 20, 2013. (4) T. J. White et al. Page 315 in: PCR Protocols: A Guide to Methods and Applications. Academic Press, San Diego, 1990.
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Zouidi, Mohamed, Amine Habib Borsali, Ayoub Allam, and Raphael Gros. "Characterization of coniferous forest soils in the arid zone." Forestry Studies 68, no. 1 (June 1, 2018): 64–74. http://dx.doi.org/10.2478/fsmu-2018-0006.
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Abstract Arid zones are very harsh environments characterized by binding edaphic and climatic factors, their rainfall is low and irregular accentuated by high temperatures and their soils are fragile and vulnerable. In recent years, it has been noted that vegetation is regressing and that the majority of reforestation has been a failure. Our study aims to know the physico-chemical and microbiological characteristics of forest soils in the pinewoods of an area of the highlands of western Algeria (Naama). For this we analyzed several soil samples spread over five sampling stations in a forest of Aleppo pine. The results show that the forest soils of our study area are characterized by a generally sandy texture and an orange color for all the selected stations. They are characterized by: a very high C/N ratio that indicates a slow evolution of organic matter and a nitrogen deficiency that is necessary for carbon decomposition. The conductivity shows that the soil contains some salinity, its permeability is strong and its humidity fairly low with an alkaline pH (> 8) due to the increase in the limestone level in the area. Basal respiration is low compared to microbial biomass due to poor physico-chemical quality of soils and the effect of water stresses that slow down microbial activities. Soils in this arid forest are generally characterized by soil homogeneity sensitive to the influence of environmental factors mainly poverty into elements necessary for its proper functioning such as nitrogen and water that accentuate soil degradation of these forest formations, which results in the risk of degradation being triggered.
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Facco, Douglas Stefanello, Ana Caroline Paim Benedetti, Waterloo Pereira Filho, Eduardo André Kaiser, and Janderlei Velasque Dal Osto. "Geotecnologias para monitoramento florestal no município de Nova Palma - Rio Grande Do Sul – BR." Revista Eletrônica em Gestão, Educação e Tecnologia Ambiental 20, no. 1 (February 27, 2016): 417. http://dx.doi.org/10.5902/2236117019946.
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Human land occupation has always been associated to gathering natural resources, where it is necessary to know about land coverage and usage dynamics. This way, the purpose of this work is to investigate temporal dynamics of forest coverage, by geotechnologies such as Remote Sensing. Methodology starts by multitemporal mapping of forest coverage in the municipality of Nova Palma, located in the Quarta Colônia de Imigração Italiana (fourth colony of italian imigration), Rio Grande do Sul. Using software SPRING, in monitored classification of satellite images of Landsat 5 Satellite in the year of 1985 Landsat 8 Satellite in the year of 2014. Afterwards spatial analysis, by Spatial Lenguage for Algebric Geopressessing (LEGAL), it was able to determine the following situation: forestal regeneration, deforestation and maintenance. Results show that reforestation areas concentrate in the influence area of Usina Hidreletrica de Dona Francisca (Hydroeletric Plant of Dona Francisca). Areas of deforestation ocurred in areas that the land are being prepared to production. The maintenance was by areas of greater terrain declivity, hill tops and watershed surroundings, areas considered Areas of Permanent Preservation (Área de Presevação Permanente - APP). In conclusion, the forestal expansion process was predominant in the municipality during monitoration season.
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Khaouani, Boumediene, Azziz Hirche, Said Bourfa, Djamaledine Berrabeh, Ilyes Hadbaoui, Okkacha Youb, and Abdessamed Derdour. "Assessing the evolution of the Aleppo Pine plantations by using field measurements and one-way Analysis of variance." Technium Social Sciences Journal 34 (August 8, 2022): 604–23. http://dx.doi.org/10.47577/tssj.v34i1.6995.
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Moudjbara area considered a gateway to Algeria's Great Sahara, was the first perimeter to be afforested with Aleppo pine in 1972 as part of a green dam initiative to combat desertification and preserve soil from wind erosion. This study examines the evolution of the species Pinus Halepensis Mill commonly known as the Aleppo pine in the Moudjbara plantations by comparing it to that of the natural forest of the Djellal Mountains in the Chergui region. Several field surveys were conducted, and four sites were selected in the natural forest and four sites in the Moudjbara afforestation. In each site, we performed 50 dendrometric measurements with 200 tree stakes. The selection is based on information on regeneration and plant quality. Stations are classified into four categories namely station of good regeneration, station slightly well regenerated, station moderately regenerated, and station of weak regeneration, which allow us to have primary reference data and to make a reliable assessment of the behavior of Aleppo pine in the Green Dam. The attribute ranking obtained from the ANOVA approximation provides us with crucial information of comparison between the natural forest and the reforestation zone. The results obtained can be used to adjust the planting density, rigorously choose the species, and adapt the soil preparation and planting techniques.
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Labarca-Rojas, Yalbeiry, J. Esteban Hernández-Bermejo, José L. Quero, and Francisca Herrera-Molina. "Bioclimatic habitat limitations for argan trees (Argania spinosa (L.) Skeels) in Northern Africa and Spain." Regional Environmental Change 22, no. 1 (January 19, 2022). http://dx.doi.org/10.1007/s10113-021-01869-w.
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AbstractArgania spinosa L. Skeels is an Algerian-Moroccan endemic tree. This species is part of various plant communities consisting of Mediterranean, Macaronesian and Saharan floristic elements. It has been introduced and perhaps sometimes naturalized in various regions of the Mediterranean basin. Due to its role in combating desertification, high socio-economic value, and traditional use as fodder and food, the southwestern Moroccan argan grove (Arganeraie) was declared Biosphere Reserve. It had already been subject to conservation and reforestation programs a century earlier. Its cultivation for oil production could be, besides an economic objective, an effective method to conserve its genetic diversity. Therefore, this study aims to estimate its potential distribution and establish efficient breeding programs by determining its ecological requirements, identifying its different habitats, and predicting habitat suitability models for Morocco, Algeria, Tunisia, and Spain. Using 53 occurrence points, wind speed and direction data, and 29 bioclimatic variables, multivariate methods were applied to describe the ecological profiles and characterize the heterogeneity of its habitat to subsequently, train a Maxent model that establishes, besides Morocco and Algeria, suitable cultivation areas in Tunisia and Spain. The North African potential area is limited to the western Mediterranean coast of Algeria and flat and coastal areas of eastern Tunisia. The increased likelihood of suitability remains in the southeast Iberian Peninsula. A high probability of argan cultivation is also evident in the Canary Islands. These results provide possibilities for future expansion of argan crop and a window of opportunity to improve its genetic diversity and conservation.
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SARMOUM, Mohamed, Rafael NAVARRO-CIRRILLO, Frederic GUIBAL, and Fatiha ABDOUN. "TYPOLOGY, PRODUCTIVITY AND DYNAMICS OF ALEPPO PINE STANDS IN THE OUARSENIS MASSIF (ALGERIA)." AGROFOR 5, no. 2 (June 10, 2020). http://dx.doi.org/10.7251/agreng2002114s.
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Aleppo pine is the most important forest species in Algeria. This species has been used for a long time in reforestation programs, notably the “green dam” planted in the 1970s. Despite this importance, the Aleppo pine continues to undergo all kinds of degradation such as land clearing, illegal cutting and fire. This situation is causing reduction of potential wood production, also jeopardizing the vitality of the stands and their regeneration. This work aims to describe the typology, productivity and dynamics of Aleppo pine stands in the Ouarsenis massif (West of Algeria). 27 plots were installed to describe the stands (composition of forest species, dbh , total height, and basal area). Regeneration was estimated by the rate of juvenile individuals (dbh5cm). The results obtained shows that the Aleppo pine develops different conditions for altitude, climate and type of soil. These conditions have a direct influence on the structure of the Aleppo pine and its productivity. The best populations develop on an average altitude (500 to 1400 m), in subhumid and semi-arid climates, on southern exposures and on limestone soils. The stands are mostly young (age 70 years) with good natural regeneration. These results put focus on the factors of degradation of the Aleppo pine, in particular the recurring fires and the lack of silvicultural management which application can improve the productivity and the vitality of the stands.
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Roblero, Rodrigo, Jesús Chávez-Morales, Laura A. Ibáñez-Castillo, and Oscar L. Palacios-Vélez. "Estimation of water erosion in the Necaxa system, Puebla, Mexico." Agro Productividad 15, no. 1 (February 8, 2022). http://dx.doi.org/10.32854/agrop.v15i1.2003.
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Objective: To estimate the potential and current water erosion in the Necaxa system and to propose alternatives aimed to reduce the siltation problem in the hydraulic infrastructure.Design/methodology/approach: The Universal Soil Loss Equation (USLE) was applied, using a Geographic Information System to process the map algebra.Results: The current estimated water erosion was 159 t ha-1 per year; this factor impacts the loss of farmland and soil nutrients, the accumulation of matter towards urban areas, the siltation of riverbeds and dams, and the loss of the system’s hydraulic works capacity.Study limitations/implications: No data about runoff plots in the field is available; therefore, it is not possible to compare current water erosion values with those obtained by the USLE applied, using the map algebra technique. Findings/conclusions: The reforestation and conservation agriculture proposal would help to reduce erosion to 16 t ha -1 per year. However, if control actions are not carried out and the current vegetation cover is not preserved, the problem can increase until it reaches potential erosion values >200 t ha -1 per year.