tailieunhanh - Báo cáo lâm nghiệp: "A flexible radial increment model for individual trees in pure even-aged stands"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: A flexible radial increment model for individual trees in pure even-aged stands. | Ann. For. Sci. 61 2004 327-335 INRA EDP Sciences 2004 DOI forest 2004026 327 Original article A flexible radial increment model for individual trees in pure even-aged stands Christine DELEUZEa Olivier PAINa Jean-Francois DHÔTEb Jean-Christophe HERVÉb a AFOCEL Station territoriale nord-est route de Bonnencontre 21170 Charrey-sur-Saône France b Laboratoire d etude des ressources forêt-bois UMR INRA-ENGREF 1092 Équipe Dynamique des Systèmes Forestiers ENGREF 14 rue Girardet CS 4216 54042 Nancy France Received 7 April 2003 accepted 22 September 2003 Abstract - To capture the common feature of various individual growth models for trees in pure and even-aged stands a generic model with a form parameter according to each species is proposed. With a final objective of implementing this model into simulation software of silvicultural treatments particular care was taken to structure the model for consistent behaviour outside the data fields of calibration and to limit the independent variables to those available to managers. The first analysis using data from a young spruce stand allowed introduction of simple variables basal area and dominant height to express competition effects. Then the model was fitted on a large data set to take into account silvicultural treatments and fertility conditions. Finally the model tested on spruce was directly adjusted for Douglas-fir and was found to be sufficiently flexible to describe growth of this species. This newly derived model is a relatively generic tool which can be fitted for other species in regular stands. tree growth model regular stand silviculture software simulation spruce Douglas-fir Résumé - Un modèle générique de croissance radiale d arbre en peuplements purs et réguliers. Un modèle générique de croissance de type arbre pour des peuplements purs et réguliers est propose en utilisant les points communs de differents modèles de la littérature et en tenant compte à travers un paramètre des différentes formes .