tailieunhanh - Báo cáo lâm nghiệp: "Physiological and morphological responses of dormant and growing Norway spruce container seedlings to drought after planting"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Physiological and morphological responses of dormant and growing Norway spruce container seedlings to drought after planting" | 201 Ann. For. Sci. 62 2005 201-207 INRA EDP Sciences 2005 DOI forest 2005011 Original article Physiological and morphological responses of dormant and growing Norway spruce container seedlings to drought after planting Pekka Helenius Jaana Luoranen Risto Rikala Finnish Forest Research Institute Suonenjoki Research Station Juntintie 154 77600 Suonenjoki Finland Received 17 March 2004 accepted 30 September 2004 Abstract - Survival root egress height growth xylem water potential and chlorophyll fluorescence of dormant and growing Norway spruce Picea abies L. Karst. container seedlings exposed to postplanting drought periods 1 2 3 and 4 weeks in the field were studied. Growth stages were created by terminating overwinter frozen storage 5 weeks growing or 5 days dormant before planting. Without postplanting drought root egress of growing seedlings during the 6-week study period was twice that of dormant seedlings. When exposed to postplanting drought growing seedlings showed a greater decline in root egress and xylem water potential than dormant seedlings. Postplanting drought had no effect on chlorophyll fluorescence in dormant seedlings whereas in growing seedlings chlorophyll fluorescence decreased after the 3-week drought period. The results indicate that planting seedlings kept dormant by prolonged frozen storage in summer is beneficial only if very long dry periods occur after planting. chlorophyll fluorescence drought growth stage Picea abies root egress Résumé - Reaction physiologique et morphologique à la sécheresse après plantation de semis dormants ou en croissance de Picea abies cultivés en conteneurs. La survie la production de nouvelles racines la croissance de la pousse le potentiel hydrique du xylème et la fluorescence de la chlorophylle ont été étudiés sur des semis de Picea abies L. Karst dormants ou en croissance cultivés en conteneurs et exposés à des périodes 1 2 3 et 4 semaines de sécheresse après plantation au champ. Pour préparer les .