TAILIEUCHUNG - Báo cáo khoa học: "Effects of canopy opening on height and diameter growth in naturally regenerated beech seedlings"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Effects of canopy opening on height and diameter growth in naturally regenerated beech seedlings. | 127 Ann. For. Sci. 58 2001 127-134 INRA EDP Sciences 2001 Original article Effects of canopy opening on height and diameter growth in naturally regenerated beech seedlings Catherine Colleta Olivier Lantera and Marta Pardosb a Équipe Croissance et Production INRA Nancy 54280 Champenoux France b Departamento de Selvicultura CIFOR-INIA Ap. Correos 28080 Madrid Spain Received 4 February 2000 accepted 13 November 2000 Abstract - In order to analyze the growth dynamics of beech seedlings growing under contrasting canopy conditions a beech stand in which two types of canopy opening canopy release or gap creation had been applied in 1995 was selected. Three and four years after the canopy had been opened 113 naturally regenerated seedlings were sampled in gaps or under the canopy. The effects of canopy opening and seedling age on annual height and diameter growth were analyzed using mixed models. Under closed canopy average annual seedling height and diameter increments were cm and mm respectively. Diameter growth increased in the first year after the canopy had been opened and exhibited considerable inter-annual variation related to climatic conditions. Conversely height growth did not increase immediately after canopy opening but increased regularly in the following years. Four years after the gap had been created annual seedling height and diameter growth were cm and mm respectively in the gaps and cm and mm respectively under released canopy. Age did not affect the dynamics of seedling growth. gap shade tolerance natural regeneration Fagus sylvatica L. mixed model Résumé - Effets de l ouverture du couvert sur la croissance en hauteur et en diamètre de semis naturels de hêtre. La dynamique de croissance de jeunes semis de hêtre poussant dans les conditions de couvert contrastées a été étudiée dans un peuple-ment à base de hêtre dans lequel deux types d ouverture du peuplement ont été réalisés. En 1995 un simple relevé de couvert a été .

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp