i n k r n a n~ Concepts of planted seedling root morphology and root locaLes concepts portant sur la morphologie des racines des semis tion are discussed in the context of reforestation in British plant6s et de la disposition des racines sont abordks dans le conColumbia. Comparison of root form and location between nattexte du reboisement en Colombie-Britannique. La comparaison ural and planted seedlings reveals profound differences. Unnatural de la forme des racines et de leur disposition entre les semis naturels root morphology and delayed development of nursery-produced et les semis plant& r6vkle des diffkrences signifi~atives. La roofing systems, with -nt planfing technigues that -hamorphologie artificielle et le d6veloppement retard6 du systkme size vertical ofroots in mineral horizons, may exacracinaire chez les semis produits en pkpinikre, en plus des techerbate harsh microenvironmental site conditions. ~~~~~~~~ niques actuelles de plantation qui mettent l'accent sur l'orientaroot systems may inhibit optimal seedling function and compro~se tion verticale des racines dans les horizons du sol minkral, peulong-term stand stability. The forest floor is seen as an appropriate vent devenir des kl6ments contraignants sous des conditions roofing medium to which planted seedlings be ready difficiles rencontr6es au niveau microenvironmental du site. Un access. A &ange in the biological geometry (direction and depth s~stkme racklaire put restreindre le dkvelo~~ement ' ptiof root development) of the planted root system may enhance surmal du semis et compromettre la stabilitk du peuplement B long terme. Le sol forestier est p e r p comme ttant un mkdium vival, establishment, and growth. The promotion of more naturappropri6 auquel les semis plant6s devraient al, lateral, surface rooting at the organiclmineral soil interface is avoir libre &, Une modification de la gbm6trie biologique (direcproposed. Site-s~cific root and planting strategies tion et profondew du dkveloppment des rncines) du syseme mcimay be required.naire des semis plant6s pourrait accroitre la survie, l'ktablissement et la croissance. La promotion d'un systkme racinaire plus Key words: regeneration silviculture, tree-planting, target naturel, se developpant latkralement et en surface au niveau de seedling stocktype, root egress, root morphology, root location, l'interface du sol organique et du sol minQal est sugg6r6e. Une forest floor, sofitemPerature9 soil moisture, frost heaving, soil nuhmorphologie des racines spkcifiques au site B reboiser ainsi que ents, mycorrhizae, site preparation, alternative stocktypes des stratkgie de plantation pourraient &tre requises.Mots clCs: sylviculture de rkgknkration, plantation d'arbres, type de semis optimal, kmersion des racines, morphologie racinaire, localisation des racines, sol forestier, tempbature du sol, humidit6 du sol, dechaussement par le gel, Blkments nutritifs du sol, mycorhizes, prkparation du site, types de semis de rechange
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