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Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Branchiness of Norway spruce in northeastern France: predicting the main crown characteristics from usual tree measurements. | Ann Sci For 1992 49 511 -538 Elsevier INRA 511 Original article Branchiness of Norway spruce in northeastern France predicting the main crown characteristics from usual tree measurements F Colin 1 F Houllier 2 INRA Centre de Recherches Forestieres de Nancy Station de Recherches sur la Qualité des Bois Champenoux F-54280 Seichamps 2 ENGREF Laboratoire ENGREF INRA de Recherches en Sciences Forestieres Unite Dynamique des Systèmes Forestiers 14 rue Girardet F-54042 Nancy Cedex France Received 5 March 1992 accepted 6 July 1992 Summary This paper is part of a study proposing a new method for assessing the quality of wood resources from regional inventory data. One component of this method is a wood quality simulation solfware that requires detailed input describing tree branchiness and morphology. The specific purpose of this paper is to construct models that predict the main characteristics of the crown for Norway spruce. One hundred and seventeen spruce trees sampled in northeastern France have been described in detail. The position of the different parts of the crown the size the insertion angle the number and the position of the whorl branches have been predicted as functions of usual whole-tree measurements ie diameter at breast height total height total age and of the position of the growth unit along the stem e distance to the top and number of growth units counted downward or upward for branchiness prediction. The most efficient predictors of crown descriptors have been established and preliminary models are proposed. branchiness Picea abies Karst modelling I wood quality crown ratio wood resources Resume Branchaison de répicéa commun dans le Nord-Est de la France prediction des prin-cipales caractéristiques du houppier à partir des mesures dendrométriques usuelles. Cette étude s insere dans le cadre d un projet qui vise à proposer une nouvelle methode d evaluation de la quanta de la ressource à partir des données issues d un inventaire forestier regional. Ce .
