Analysis of dendrometric diversity among natural populations of cork oak (Quercus suber L.) from Morocco
Analysis of dendrometric diversity among natural populations of cork oak (Quercus suber L.) from Morocco
The cork oak (Quercus suber L.) has been the focus of research dealing with the conservation and reforestation of this species due to its economic importance and the problem of deforestation affecting it. The genetic diversity of this tree species, its main aspect of adaptation, has not been sufficiently studied. The Moroccan cork oak tree is found in the northern part of the country, where the fruits of the tree are soft corns. This forest tree species has undergone a strong decline due to many factors, including a significant loss of its biological diversity. While working within the national framework of protection and enhancement of this tree species, our research aimed to analyze and assess the phenotypic diversity of different provenances, using qualitative and quantitative dendrometric traits and geographical characteristics such as the total height of the tree (H), the height to the first branch (Hbr), girth (Gir), surface coefficient of the bole (K) (K = (H × Gir/200)), number of branches (NbrBr), vigor (V), foliage density (D), and altitude. The population of trees studied included 390 individuals from 6 regional provenances: the central plateau, Mamora, the Middle Atlas, the western Rif, the eastern Rif, and the Atlantic Rif. Univariate analysis showed a highly significant variability among these provenances. The highest coefficient of variation concerned K (62.79%) and Gir (42%), followed by NbrBr and Hbr with 32% and 30%, respectively. Hierarchical clustering led to the identification of 2 major groups, with the central plateau and eastern Rif representing the first group, and the Middle Atlas, western Rif, Atlantic Rif, and the Mamora forest representing the second group. The assembling of different groups as explained by dendrometric variation is mainly based on geographical traits.
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- Aafi A, Achhal EL, Kadmiri A, Benabid A, Rouchdi M (2005a). Richesse et diversité floristique de la subéraie de la Mamora (Maroc). Acta Bot Malacitana 30: 127138 (in French).
- Aafi A, Achhal EL, Kadmiri A, Benabid A, Rouchdi M (2005b). Utilisation des images satellitaires SPOT pour la cartographie des types de peuplements de la forêt de la Mamora (Maroc). RFPT 178 (2): 3035 (in French).
- A.E.F.C.S. (1973). Procès Verbal dAménagement de la Forêt de la Mamora 19731992, 35 (in French).
- Avise JC (2000). Phylogeography: The History and Formation of Species. Cambridge, MA, USA: Harvard University Press.
- Belhabib N, Ouassou A, Dahmani J, Douira A (2005). Contribution à létude de lintrogression génétique entre Quercus suber L. et Q. rotundifolia (Lamk.) Trabut au Maroc par lutilisation des marqueurs microsatellites. Bulletin de lInstitut Scientifique, Rabat, Section Sciences de la Vie; 2627: 3134 (article in French with an abstract in English).
- Belghazi B, Ezzahiri M, Amhajar M, Benziane M (2001). Régénération artificielle du chêne-liège dans la forêt de la Mâamora (Maroc). Forêt méditerranéenne t. XXII, 3(in French).
- Bellarosa B, Schirone B, Maggini F, Fineschi S (1996). Inter- and intraspecific variation in three Mediterranean oaks (Q. cerris, Q. suber, Q. crenata). In: Kremer A, Mühs HJ, editors. Proceedings of the Workshop on Inter- and Intraspecific Variation in European Oaks: Evolutionary Implications and Practical Consequences. Brussels, Belgium: Official Publication of the European Communities, pp. 239276.
- Benabid A (2000). Flore et écosystème du Maroc: évaluation et préservation de la biodiversité. Paris: Ibis Press, pp. 357 (in French).
- Cermak J, Riguzzi F, Ceulemans R (1998). Scaling up from the individual trees to the stand level in Scots pine: 1. Needle distribution, overall crown and root geometry. Ann Sci For 55: 6388.
- Coelho AC, Lima MB, Neves D, Cravador A (2006). Genetic diversity of two evergreen oaks (Quercus suber L. and Quercus ilex subsp. rotundifolia Lam.) in Portugal using AFLP markers. Silvae Genet 55: 105118.
- El Antry Tazi S, Abourouh M (2008). Etat de connaissances scientifiques sur les subéraies : bilan et perspectives. Ann Rech For Maroc t. 39: 918 (in French).
- Elena-Rossello JA, Lumaret R, Cabrera E, Michaud H (1992). Evidence for hybridization between sympatric Holm oak and cork oak in Spain based on diagnostic enzyme markers. Vegetation 99100: 115118.
- El Yousfi SM, Hoffmann D, Mtarji BA (1997). Système réglementaire de récolte et dutilisation des semences forestières au Maroc. Ann Rech For Maroc sp: 207227 (in French).
- Faith DP (1992). Conservation, evaluation and phylogenetic diversity. Biol Conserv 61: 110.
- Faith DP, Minchin PR, Belbin L (1987) Compositional dissimilarity as a robust measure of ecological distance. Vegetatio 69: 5768.
- Frison E, Varela MC, Turok J (1995). Quercus suber network. Report of the first two meetings, 13 December 1994 and 2627
- February 1995; Rome, Italy: EUFORGEN/IPGRI, p. 41.
- Gandour M, Khouja M, Toumi L, Tariki S (2007). Morphological evaluation of cork oak (Quercus suber L.): Mediterranean provenance variability in Tunisia. Ann Sci For 64: 549555.
- García-Valdecantos JL, Catalán G (1993). Possible criteria for selection of Quercus suber plus trees. Ann Sci For 50 (Suppl 1): 448451.
- GTZ (1997). Les ressources génétique forestières au Maroc peuplement à graines classés et arbres plus. Volume 6, chêne liège (Quercus suber L.) (in French).
- Hammoudi A. 2002. La subéraie: biodiversité et paysage. HautCommissariat aux Eaux et Forêts et à la Lutte contre la Désertification. VIVEXPO 2002, VIVES 30 Mai2 Juin 2002, MCEF, Maroc (in French).
- Hirakawa Y, Nagao H, Yamashita K, Toshinari T (2002). Intravascular variations in wood properties of Japanese Cedar (Cryptomeria japonica) planted on sloping ground. FFPRI 48: 6372.
- Jiménez P, Agúndez D, Alía R, Gil L (1999). Genetic variation in central and marginal populations of Quercus suber L. Silvae Genet 48: 278284.
- Lopez-Aljorana A, Ángeles Bueno M, Aguinagalde I, Pedro Martin J (2007). Fingerprinting and genetic variability in cork oak (Quercus suber L.) elite trees using ISSR and SSR markers. Ann For Sci 64: 773779.
- Lumaret R, Tryphon-Dionnet M, Michaud H, Sanuy A, Ipotesi E, BORN C, Mir C (2005). Phylogeographical variation of chloroplast DNA in cork oak (Quercus suber L.). Ann BotLondon 96: 853861.
- Mona CP, Claude G, Frederic G, Maurice R (2004). Dendrometry and morphometry of Pinuspinea L. in Lower Provence (France): adaptability and variability of provenances. Forest Ecol Manag 194: 319333.
- Nixon KC (1993). Infrageneric classification of Quercus (Fagaceae) and typification of sectional names. Ann Sci For 50 (Suppl 1): 25s34s.
- Ohsawa T, Saito Y, Sawada H, Ide Y (2008). Impact of altitude and topography on the genetic diversity of Quercus serrata populations in the Chichibu Mountains. Central Japan Flora 203: 187196.
- Perrier X, Flori A, Bonnot F (2003). Data analysis methods. In: Hamon P, Seguin M, Perrier X, Glaszmann JC, editors. Genetic Diversity of Cultivated Tropical Plants. Montpellier, France: Science Publishers, pp. 4376.
- Schaal BA, Haywood DA, Olsen KM, Rausher JT, Smith WA (1998). Phylogeographic studies in plants: problems and prospects. Mol Ecol 7: 465474.
- Simeone MC, Alessio P, Federico V, Rosanna B, Francesco S, Bartolomeo S (2009). Multiple genome relationships and a complex biogeographic history in the eastern range of Quercus suber L. (Fagaceae) implied by nuclear and chloroplast DNA variation. Caryologia 62: 3: 236252.
- Toumi L, Lumaret R (1998). Allozyme variation in cork oak (Quercus suber L.): the role of phylogeography and genetic introgression by other Mediterranean oak species and human activities, Theor Appl Genet 97: 647656.
- Wahid NC, González-Martínez S, Elhadrami I, Abdelaliboulli A (2006). Variation of morphological traits in natural populations of maritime pine (Pinus pinaster Ait.) in Morocco. Ann Sci For 63: 8392.