TAILIEUCHUNG - Báo cáo lâm nghiệp: "The effects of stock type and radicle pruning on blue oak morphology and field performance"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: "The effects of stock type and radicle pruning on blue oak morphology and field performance. | Ann Sci For 1996 53 641-648 Elsevier INRA 641 Short note The effects of stock type and radicle pruning on blue oak morphology and field performance DD McCreary University of California Sierra Foothill Research and Extension Center 8279 Scott Forbes Road Browns Valley CA 95918 USA Received 10 November 1994 accepted 2 November 1995 Summary Blue oak Quercus douglasii Hook Am acorns were germinated and divided into three groups or stock types. The first group was directly sown in the field the second was sown into containers and grown for 4 months before outplanting and the third was grown for a year before out-planting. In addition each of these groups was further divided into three radicle pruning treatments i radicles left intact ii 2-3 mm cut from radicle tip and iii radicles pruned back to 1 cm. Results indicated that radicle pruning dramatically altered the morphology of container seedlings but had almost no effect on field performance stock type however dramatically influenced field growth and survival with the directly sown acorns and the 4-month-old seedlings growing far faster than the 1 -year-old seedlings. blue oak radicle pruning I regeneration seedling production California Resume Les effets de la qualité des plants et du cernage racinaire sur la morphologie et la croissance de Quercus douglasii. Des glands de Quercus douglasii ont été mis à germer et répar-tis en trois groupes OU types de plants. Le premier a été semé directement au champ le second a été élevé en conteneurs pendant 4 mots et le troislème pendant un an avant transplantation. De plus cha-cun de ces groupes a été subdivisé en trois traitements de cernage racinaire I racines intactes ii ablation de 2-3 mm a I apex Hi cernage à 1 cm. Les résultats indiquent que le cernage a fortement modify la morphologie des semis en conteneurs mais n avaitpratiquement aucun effet sur les performances de croissance après transplantation. En revanche le type de plants a fortement affecte la croissance et la .

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