Browsing by Author "Norero, Aldo"

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    A functional-structural model for radiata pine (Pinus radiata) focusing on tree architecture and wood quality
    (OXFORD UNIV PRESS, 2011) Paulina Fernandez, M.; Norero, Aldo; Vera, Jorge R.; Perez, Eduardo
    Backgrounds and Aims Functional-structural models are interesting tools to relate environmental and management conditions with forest growth. Their three-dimensional images can reveal important characteristics of wood used for industrial products. Like virtual laboratories, they can be used to evaluate relationships among species, sites and management, and to support silvicultural design and decision processes. Our aim was to develop a functional-structural model for radiata pine (Pinus radiata) given its economic importance in many countries.
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    Morphological trends in main stem of Pinus radiata D. Don: Transition between vegetative and reproductive phase
    (TAYLOR & FRANCIS AS, 2007) Fernandez, Maria Paulina; Norero, Aldo; Barthelemy, Daniel; Vera, Jorge
    Developmental patterns of structural units of the main tree axis of Pinus radiata were investigated in two plantations in Chile growing under different ecological conditions. Environmental characteristics of sites were recorded and structural features of sample trees were measured. Annual shoot length, number of growth units per annual shoot, growth unit length, and number of branches and cones per growth unit were statistically compared between sites and between vegetative and reproductive phases of trees. No clear pattern of stand development was apparent when variables were directly examined in terms of actual dimensions ( cm) and time scale ( years). In contrast, common patterns of development of structural parameters were indicated after dimensions and time were normalized so as to express them on a ontogenetic scale. The number of growth units per annual shoot and average length of annual shoot increased during the juvenile stage of development. Transition from juvenile to mature stages brought about a change in this trend, either stabilizing or reversing the pattern of development and size of these structural elements. The practical consequence of these changes on wood quality for industrial purposes is discussed.
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    Relation between length and diameter of Pinus radiata branches
    (TAYLOR & FRANCIS AS, 2006) Fernandez, M. Paulina; Norero, Aldo
    The purpose of this study was to construct a model for the architecture of branches in Pinus radiata D. Don and to use it as a part of a modelling effort to relate timber quality as a function of growth and development. Diameter of branches at the insertion point and their length were measured from two types of branches on 2127 normal, healthy and growing branches of different ages, on 15-year-old radiata pine growing in a good and medium productive site in Chile, in stands that either were left without management or had been thinned and pruned. Statistical analysis showed a simple linear relationship between length and diameter with a common proportionality coefficient (slope) in both types of branches, different sites and management regimens. The equation for order 2 branches differed from that of order 3 branches only in the intercept. The results suggest that the uniform linear relationship between branch length and branch diameter could be applied to radiata pine stands of different site fertility and management regimens.