TAILIEUCHUNG - Báo cáo lâm nghiệp: "Geographic variation and bud dormancy in seedlings (Fagus sylvatica L)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: "Geographic variation and bud dormancy in seedlings (Fagus sylvatica L). | 967 Ann Sci For 1996 53 967-979 Elsevier INRA Original article Geographic variation and bud dormancy in beech seedlings Fagus sylvatica L M Falusi R Calamassi Dipartimento di Biologia Vegetate Laboratori di Botanica agraria e forestale Università di Firenze Piazzale delle Cascine 28 50134 Florence Italy Received 10 March 1995 accepted 23 August 1995 Summary - Italian populations of beech originating from zones of similar altitudes but different latitudes 38 16 -43 49 N were studied. The seedlings 1 and 2 years old were grown in Florence 43 45 under natural conditions or in climate-controlled chambers with short SD or long day LD after having been exposed or not to winter chilling CH and NCH respectively . Differences observed in precociousness of sprouting thermal time growth in length and duration of growing season all indicate a variation among the populations tied to the latitude of their zones of origin. Winter chilling was demonstrated to be the principal factor in the removal of dormancy in all the populations studied. In the northernmost populations a significant effect on sprouting was attributable also to photoperiodic regime. The interaction chilling X long day indicates that LD is able to partially substitute winter chilling and that once the need for removal of dormancy has been satisfied temperature is presumably the principal environmental factor that controls sprouting. bud dormancy chilling Fagus sylvatical growing season photoperiod Resume - Variation géographique et dormance des bourgeons Chez de jeunes plants de hêtre Fagus sylvatica L . Sur de jeunes plantules de hêtre on a étudié la variation géographique du débourrement printanier et influence qu ont le froidpendant I hiver et le regime photopériodique sur la sortie de dormance. Les altitudes des lieux de provenance du materiel sont identiques mais les latitudes sont differentes. Dans la premiere experience on a cultivé les plantules des trois populations Bagno di Romagna latitude 43 49 N .

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