TAILIEUCHUNG - Báo cáo lâm nghiệp: "Influence of light conditions on the predetermination of foliar characteristics in Betula alleghaniensis Britton"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Influence of light conditions on the predetermination of foliar characteristics in Betula alleghaniensis Britton. | 497s Ann. Sci. For. 1989 46 suppl. 497s-501s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Influence of light conditions on the predetermination of foliar characteristics in Betula alleghaniensis Britton M. Labrecque1 p. Bellefleur2 . Simon3 and s. Popovich4 1 Jardin Botanique de la Ville de Montréal 4101 est rue Sherbrooke Montréal Qc H1X2B2 2 Faculte de Foresterie et Géodésie Université Laval Ste-Foy Qc G1K 7P4 __ 3 Departement des Sciences Biologiques Université de Montreal Montreal Qc H3C 3J7 and 4 Centre de Foresterie des Laurentides Forets Canada . 3800 Ste-Foy Qc G1V4C7 Canada Introduction Several studies have shown that the morphology and physiological processes of leaves are largely influenced by light conditions in the environment. However little is known about the importance of light conditions during the previous year on the development of leaves the following spring. A few researchers have reported contradictory information. Isanogle 1944 Cormack and Gorham 1953 and more recently Goulet and Bellefleur 1986 found that light intensity before leaf expansion was not important in determining leaf characteristics and that leaf expression was not predetermined in the bud. Other reports concluded that the anatomical and physiological characteristics of early leaves preformed in the winter buds which emerge shortly after bud break are primarily determined by the light conditions prevailing during the previous growth season Hansen 1959 Roy eta . 1986 . The objective of this study was to determine the effect of various light treatments applied during one growth season on the morphology and chlorophyll content of leaves developing during the following year. The study was conducted with reforestation in mind and takes into account the problem of changes in light conditions which seedlings grown in the nursery for 1 or 2 seasons are subjected to when planted. Materials and Methods During one growth season n 50 seedlings of yellow birch Betula .

• 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