tailieunhanh - Báo cáo khoa học: "Estimation of total yield of Douglas fir of incomplete growth series"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Estimation of total yield of Douglas fir of incomplete growth series. | 345 Ann Sci For 1994 51 345-355 Elsevier INRA Original article Estimation of total yield of Douglas fir by means of incomplete growth series J Begin 1 JP Schutz 2 1 Faculte de Foresterie et de Géomatique Université Laval Quebec G1K 7P4 Canada 2 École Polytechnique Federate de Zurich ETH-Zentrum 8092 Zurich Suisse Received 30 June 1993 accepted 15 February 1994 Summary - This study establishes and validates a method that takes into account yield levels and permits the reconstruction and modelling of the evolution of total yield based on incomplete growth series. The calculation of total yield of Douglas fir Pseudotsuga menziesii Mirb Franco var menziesii Franco is carried out by integrating the equation of volume increment per metre dominant height growth. The model utilized explains of the variation in volume increment per metre height growth of the 14 experimental plots. The evolution of total yield is calculated for 4 current increment levels. The concept of current increment levels is similar to the concept of yield levels and corresponds to the value of volume increment per metre height growth at a height of 30 m. At an equivalent yield level the calculated total yield curves correspond closely to those calculated by Bergel 1985 . total yield I yield level I current increment level I volume increment Douglas fir Resume Estimation de la production totale du Douglas vert au moyen de series de croissance partielles. Cette étude établit et valide une methode qui tient compte de niveaux de production et qui permet de reconstituer et de modéliser revolution de la production totale à partir de series de croissance partielles. Le calcul de la production totale du Douglas vert Pseudotsuga menziesi Mirb Franco var menziesii Franco s effectue en integrant equation de I accroissement en volume par metre d accroissement en hauteur dominante. Le modèle utilise explique 94 8 de la variation de I accroissement en volume par metre d accroissement en hauteur des 14 .