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Ciência Florestal
Centro de Pesquisas Florestais - CEPEF, Departamento de Ciências Florestais - DCFL, Programa de Pós Graduação em Engenharia Florestal - PPGEF
ISSN: 0103-9954
EISSN: 0103-9954
Vol. 26, No. 3, 2016, pp. 901-912
Bioline Code: cf16078
Full paper language: Portuguese
Document type: Research Article
Document available free of charge

Ciência Florestal, Vol. 26, No. 3, 2016, pp. 901-912

 en MODELING THE EFFECT OF PRUNING AND THINNING ON GROWTH STRAIN OF Eucalyptus globulus check for this species in other resources Labill.
Navarrete, Eduardo; Valenzuela, Carolina & Nutto, Leif

Abstract

A 12-year-old Eucalyptus globulus check for this species in other resources plantation forest was studied with the aim of assessing and modeling the effect of both pruning and thinning activities on the growth strain. The stand is located in the Andean foothills of Bío Bío region in Chile. Two forest management activities were carried out after 2 and half years from planting, and were evaluated according to different pruning intensities (from 0 to 60 % from total height of the tree) and different thinning densities (800 UPH with thinning and 1.600 UPH without thinning). Furthermore, the effect of the crown classes (dominant, co-dominant and intermediate crown) was studied by the combination of two treatments on the behavior of the growth strain. Each treatment was defined by two levels of pruning and thinning. Data at single-tree level were collected to each sampling unit for estimating the most relevant parameter for the stand. Thirty-three trees in total were sampled. The growth strain was measured at the dbh in each one of them, with an extensometer designed by the CIRAD-Forêt. The pruning and thinning did not significantly affect the behavior of the growth strain in Eucalyptus globulus according to the research study; on the other hand, the crown class had a highly significant affect on the variation of strains, showing the highest levels of it in dominant crown class trees that trees belonging to co-dominant and intermediate crown classes, respectively. The logarithmic functions and the variance obtained by measurements of dbh, crown radii, and pruning respectively, were entered into regression models as predictor variables of behavior of growth strain, showing a R2 0,44 and a SEE 0,132.

Keywords
crown class; Eucalyptus; growth strain; silvicultural treatment

 
 pt MODELACIÓN DEL EFECTO DE LA PODA Y RALEO SOBRE LAS DEFORMACIONES RESIDUALES LONGITUDINALES EN Eucalyptus globulus check for this species in other resources Labill.
Navarrete, Eduardo; Valenzuela, Carolina & Nutto, Leif

Resumo

Se estudió una plantación de Eucalyptus globulus check for this species in other resources ubicada en el sector precordillerano andino de la región del Bío Bío, Chile, con el objetivo de evaluar y modelar el efecto de la poda y raleo sobre las deformaciones residuales longitudinales (DRL). El lugar de estudio correspondió a un rodal de 12 años de edad, el cual fue intervenido a los 2 años y medio de establecido, donde se evaluaron distintas intensidades de poda (0% y 60% de la altura total) y densidades de raleo (1.600 árb·ha-1 (sin raleo) y 800 árb·ha-1). En cada tratamiento definido por la combinación de los dos niveles de poda y raleo, se estudió además, el efecto de la clase de copa (dominante, codominante e intermedia) sobre el comportamiento de las DRL. En cada unidad de muestreo se registraron variables a nivel de árbol individual, estimando los parámetros de rodal más relevantes. Se muestreó un total de 36 árboles, midiéndose en cada uno de ellos las DRL a nivel del Dap con un extensómetro diseñado por el CIRAD-Forêt. Los resultados determinaron que la poda y raleo no afectaron significativamente el comportamiento de las DRL en Eucalyptus globulus; en cambio, la clase de copa, tuvo un efecto altamente significativo sobre la variación de las deformaciones residuales, presentando los árboles dominantes mayores niveles de deformación que las clases de copa codominante e intermedia, respectivamente. El modelo de estimación incluyó como variables predictivas del comportamiento de las DRL, las expresiones logarítmicas del Dap y del inverso multiplicativo de la varianza de los radios de copa, además de la poda, presentando un R2 de 0,44 y un EEE de 0,132.

Palavras-chave
Eucalyptus; clase de copa; manejo silvícola; deformación residual longitudinal

 
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