tailieunhanh - Báo cáo lâm nghiệp: " Growth and mineral content of young chestnut trees under controlled conditions of nutrition"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: | Ann Sci For 1997 54 681 -693 Elsevier Inra 681 Original article Growth and mineral content of young chestnut trees under controlled conditions of nutrition A Laroche V Freyssac A Rahmani JP Verger H Morvan Laboratoire de biologie cellulaire végétale et valorisation des espèces ligneuses facidte des sciences 123 rue A-Thomas 87060 Limoges cedex France Received 23 August 1996 accepted 3 March 1997 Summary - The growth of young forest trees under conditions of controlled nutrition limiting export and import of nutrients is an efficient tool to obtain a rapid understanding of the direct effects of fertilization. This approach reveals the ability of chestnut trees to i grow in a poor soil with no additional supply of minerals for at least 2 years and ii draw elements from the mineral reserve of the soil. The growth of trees is enhanced by supplying nutrients especially NPK. These nutrients directly modify the element availability in the soil and increase its pH. They also induce variations in cation content within different organs eg significant increases in calcium and magnesium but not in potassium content. Moreover manganese seems to be important for the cationic balance in all organs as it is accumulated when trees are unfertilized but not when quick-lime is supplied. calcium Castanea sativa I fertilization growth mineral nutrition Resume - Croissance et contenu mineral de jeunes châtaigniers cultivés en conditions nutritives contrôlées. La culture contrôlée de jeunes arbres forestiers en limitant les entrees et sorties d elements minéraux permet d evaluer rapidement les effets directs de la fertilisation. Ainsi le Chataignier est capable de pousser pendant au moins deux ans sur un substrat pauvre et sans amendement montrant ainsi son aptitude à puiser des elements dans la reserve minérale du sol. Toutefois une fertilisation notamment par NPK améliore sa croissance. Ces apports modifient la disponibilité des elements dans le sol y augmentent le pH et provoquent des

• 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