tailieunhanh - Báo cáo khoa học: "Growth and development of individual Douglas-fir in stands for applications to simulation in silviculture"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Growth and development of individual Douglas-fir in stands for applications to simulation in silviculture. | Ann Sci For 1991 48 651 -666 Elsevier INRA 651 Original article Growth and development of individual Douglas-flr in stands for applications to simulation in silviculture JM Ottorini INRA-Nancy Station de Sylviculture et Production 54280 Champenoux France Received 23 May 1991 accepted 9 September 1991 Summary Growth and development of individual Douglas-fir Pseudotsuga menziesii Mirb Franco were studied on the basis of a sample of 44 trees felled in the north east of France taking into consideration various stand conditions. This work was conducted with a view to future use of the information In a simulation system to predict the effects of silvicultural treatments on Douglas fir stands stem and branches were analysed In all trees and relationships combining branch growth with growth and development of crown and stem were obtained. These relationships give insight into interactions between tree growth and stand dynamics. Among the prediction equations obtained a major one was tested on a further 12 newly felled trees analysed for past bole Increments and crown development reconstruction. This suggested the use of a scaling factor to correct a possible underestimation. Douglas-flr Pseudotsuga menzesli I crown stem growth and development silviculture Résumé Crolssance et développement Individuals du douglas en peuplement. Applications à la simulation en sylviculture. La croissance et le développement individuals du douglas Pseudotsuga menziesll Mirb Franco ont été étudiés à partir d un óchantillon de 44 arbres abattus dans le Nord-Est de la France en tenant compte de differentes conditions de peuplement. Ce travail a été effectud dans le cadre d une exploitation ultérieure des résultats par un systdme de stimulation de fagon à prddire les effets de traitements syvicoles sur les peuplements de douglas. La tige et les branches de tous les arbres ont dtd analysdes et des relations liant la croissance des branches à la croissance et au ddveloppement du houppier et de la .