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Effects of genetic entry and competition by neighbouring trees on growth and wood properties of cloned Norway spruce (Picea abies)
Effets de la part génétique et de la concurrence des arbres voisins sur la croissance et les propriétés du bois de clones d’épicéa (Picea abies)
Annals of Forest Science volume 66, page 806 (2009)
Abstract
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• The aim of this work was to study both the effects of genetic entry and competition by neighbouring trees on growth, yield, wood density traits and fibre properties of 20 Norway spruce clones grown in an experimental trial located in southern Finland. The material included 10 Finnish clones, 2 Russian clones and 8 provenance-hybrids clones, the latter ones representing crosses between Finnish and foreign parent trees.
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• We found that, compared to growth and yield, wood density traits and fibre properties showed, on average, lower phenotypic variations. Moreover, significant differences could be observed among the clones regardless of the trait (p < 0.05). Conversely, on average, no clear differences could be found between Finnish, Russian and provenance-hybrids clones in most of the studied traits.
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• The marked differences among the clones, and lack of clear differences among the provenances suggested that any ranking, regarding different traits, should be based on individual clones. The phenotypic correlations between different traits ranged from moderate to strong suggesting that selection based on one trait would affect other traits. Regardless of clone, the growth of trees (e.g. breast height diameter) decreased and the wood density increased with increasing competition by neighbouring trees, which was expressed by competition index.
Résumé
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• Le but de ce travail était d’étudier à la fois les effets de la part génétique et de la concurrence des arbres voisins sur la croissance des arbres, la production, les caractéristiques de la densité du bois et les propriétés des fibres de 20 clones d’épicéa cultivés dans un dispositif expérimental d’essai situé dans le sud de la Finlande. Le matériel était constitué de 10 clones finlandais, 2 clones de Russie et de 8 provenances de clones hybrides, ces derniers représentant les croisements entre arbres parents le Finlandais et étrangers.
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• Nous avons trouvé que, comparativement à la croissance et à la production, la densité du bois et les caractéristiques des propriétés des fibres montraient, en moyenne, de plus faibles variations phénotypiques. En outre, des différences significatives ont pu être observées chez les clones, quel que soit le caractère (p < 0, 05). Inversement, en moyenne, pour la plupart des caractéristiques étudiées, on n’a pas constaté de différences claires entre les clones finlandais, russes et les provenances de clones hybrides.
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• Les différences marquées entre les clones, et l’absence de différences évidentes entre les provenances ont suggéré que tout classement, en ce qui concerne les différentes caractéristiques, devrait être basé sur des clones individuels. Les corrélations phénotypiques entre les différentes caractéristiques varient de modéré à fort, suggérant que la sélection sur la base d’une caractéristique serait de nature à affecter les autres caractéristiques. Indépendamment des clones, la croissance des arbres (par exemple le diamètre à hauteur de poitrine) a diminué et la densité du bois a augmenté avec l’accroissement de la concurrence des arbres voisins, qui a été exprimée par l’index de concurrence.
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Zubizarreta Gerendiain, A., Peltola, H., Pulkkinen, P. et al. Effects of genetic entry and competition by neighbouring trees on growth and wood properties of cloned Norway spruce (Picea abies). Ann. For. Sci. 66, 806 (2009). https://doi.org/10.1051/forest/2009075
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DOI: https://doi.org/10.1051/forest/2009075