tailieunhanh - Báo cáo khoa học: "atterns in individual growth, branch population dynamics, and growth and mortality of first-order branches of Betula platyphylla in northern Japan"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Patterns in individual growth, branch population dynamics, and growth and mortality of first-order branches of Betula platyphylla in northern Japan. | 587 Ann. For. Sci. 57 2000 587-598 INRA EDP Sciences Original article Patterns in individual growth branch population dynamics and growth and mortality of first-order branches of Betula platyphylla in northern Japan Kiyoshi Umeki L and Kihachiro Kikuzawa a Hokkaido Forestry Research Institute Koshunai Bibai Hokkaido 079-0198 Japan b Laboratory of Forest Biology Graduate School of Agriculture Kyoto University Japan Received 1 February 1999 accepted 27 March 1999 Abstract - Growth of individual trees population dynamics of first-order branches within individuals and growth and mortality of first-order branches were followed for two years in an plantation of Betula platyphylla in central Hokkaido northern Japan. The data were analyzed by stepwise regressions. The relative growth rate in terms of above-ground biomass of individuals was negatively correlated with a log-transformed competition index ln CT which was calculated for each individual from the size and distance of its neighbours. The change in branch number within an individual was also correlated with ln CT . The growth and mortality of branches was correlated with the size of branches size of individuals growth of individuals relative height of branches and ln CT . Generally the patterns revealed by the regressions were consistent with what was expected and can be used as references against which the behavior of more detailed process-based models can be checked. Betula platyphylla branch population dynamics competition branch growth branch mortality Résumé - Modèles de croissance individuelle dynamique de développement des branches et croissance et mortalité des branches du Betula Platyphylla La croissance des arbres individuels la dynamique de développement des branches de premier ordre sur les arbres individuels ainsi que la croissance et la mortalité des branches de premier ordre ont été étudiées pendant deux ans dans une pépinière de Betula Platyphylla de la région centrale du Hokkaido dans le nord du .