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      MADERA DE COMPRESIÓN EN PINUS RADIATA D. DON: I, CARACTERÍSTICAS ANATÓMICAS Translated title: COMPRESSION WOOD IN RADIATA PINE: I, ANATOMICAL FEATURES

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          Abstract

          Se caracterizó la madera de compresión en 10 árboles de Pinus radiata D.Don con inclinaciones menores a 10 º en dos sitios.          Los diámetros de traqueidas de los árboles del sitio Arena húmeda resultaron estadísticamente mayores que los del sitio Arcilla; pero no resultaron diferentes al comparar madera juvenil y madura o al compara madera de compresión con madera opuesta.          Diferencias significativas se determinaron en el largo de traqueida entre sitios (Arena húmeda-Arcilla), tipo de madera (madera de compresión-opuesta) y edad (madera juvenil-madura), resultados coincidentes con otros autores.          Para el coarseness diferencias no significativas entre sitios, así como entre madera juvenil y madura y entre madera de compresión y opuesta coinciden y difieren de los de otros autores que comparan árboles de distintos sitios.          Las discrepancias y coincidencias de estos resultados con los de otros autores se explican considerando el comportamiento diferente de las dimensiones celulares de la madera temprana y tardía y las diferencias que hay entre madera de compresión leve y la madera de compresión severa

          Translated abstract

          Compression wood in 10 Pinus radiata D. Don trees with lean smaller to 10º from two sites were characterized. The tracheid diameters of the trees of the humid sand site were statistically greater than those from the clay site; but they were not different when comparing juvenile wood with mature wood or to it compares compression wood with opposite wood.          Significant differences were determined in the tracheid length between sites (humid sand-clay), type of wood (compression-opposite wood) and age (juvenile-mature wood), were similar results with other authors.          For coarseness non significant differences between sites, as well as between juvenile and mature wood and compression and opposite and agree and different from those of other authors who compare trees of different sites.          The discrepancies and coincidences of these results with those of other authors are explained considering the behavior from the cellular dimensions of the earlywood and latewood wood and the differences between severe compression and mild compression wood

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          Most cited references45

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          Rapid Measurement of the Transverse Dimensions of Tracheids in Radial Wood Sections fromPinus radiata

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            Recent progress in the chemistry and topochemistry of compression wood

            T E TIMELL (1982)
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              Hydraulic properties of Douglas-fir (Pseudotsuga menziesii) branches and branch halves with reference to compression wood.

              Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) branch segments were used to test the hypothesis that compression wood reduces xylem transport efficiency. Whole 3-year-old segments were first measured for specific conductivity (k(s), m(2) s(-1) MPa(-1)), then split lengthwise into upper and lower halves, the latter containing all or most of the compression wood in the segment. Halves were then remeasured for k(s) using a new technique that prevents leakage of permeating fluid during measurements. Lower branch halves had significantly lower k(s) than upper halves (6.4 +/- 0.3 versus 9.3 +/- 0.3 m(2) s(-1) MPa(-1) x 10(-4), respectively; n = 36), and despite their larger size, significantly lower hydraulic conductivity (k(h), m(4) s(-1) MPa(-1)) than upper halves. Lower branch halves had higher specific gravity (0.51 +/- 0.01 versus 0.45 +/- 0.01; n = 36), lower water content (123 +/- 2% versus 155 +/- 3%; n = 36), and larger proportions of volume occupied by both cell wall and air than upper halves. Lower halves had more tracheids per annual ring than upper halves (73 +/- 3 versus 63 +/- 2 per radial transect, respectively; n = 36), but tracheids were shorter and had narrower lumens than those of upper branch halves. Differences in hydraulic properties between upper and lower halves suggest that compression wood does reduce xylem transport efficiency. In contrast, the amount of compression wood in each sample did not explain any variation in whole unsplit sample hydraulic properties.
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                Author and article information

                Journal
                maderas
                Maderas. Ciencia y tecnología
                Maderas, Cienc. tecnol.
                Universidad del Bío-Bío (Concepción, , Chile )
                0718-221X
                2007
                : 9
                : 1
                : 29-43
                Affiliations
                [02] Concepción orgnameUniversidad de Concepcion orgdiv1Facultad de Ciencias Forestales Chile lvalenzu@ 123456udec.cl
                [01] Valdivia orgnameUniversidad Austral de Chile orgdiv1Instituto de Tecnología de Productos Forestales Chile
                Article
                S0718-221X2007000100003 S0718-221X(07)00900103
                e87f6c58-6f77-4960-b225-731bb0710fa2

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 01 December 2006
                : 05 September 2006
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 48, Pages: 15
                Product

                SciELO Chile

                Categories
                ARTICULOS

                Lend stems,mild compression wood,tracheid length,pino radiate,coarseness,tracheid diameter,opposite wood,earlywood,laterwood,Fustes inclinados,madera de compresión leve,largo de traqueidas,pino radiata,diámetros de traqueidas,madera opuesta,madera juvenil,madera madura

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