松木幼材的物理力学特性和生长特性随树龄和种植间距的变化

IF 0.6 4区 农林科学 Q4 FORESTRY Revista Arvore Pub Date : 2022-01-01 DOI:10.1590/1806-908820220000027
Érica Machado Garbachevski, É. Hillig, Raul de Abreu Neto, F. A. D. S. Retslaff, H. Koehler
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引用次数: 1

摘要

自20世纪60年代以来,巴西南部以不同的间距和较短的采伐期种植松林,以提高木材产量。减少轮作周期和改变人工林的间距可以影响木材的物理和机械特性,因为它们是年轻的树木,在其组成中还没有大量的成熟木材。在此背景下,本研究旨在研究3种种植间距(3.0 × 2.0 m、4.0 × 2.0 m和2.0 × 2.0 m)和2种树龄(13和15年树龄)对木材生长特性和物理力学性能的影响及其相互关系。评估了表观密度、后期木材百分比、每英寸环数、静态弯曲强度和刚度以及平行于颗粒的压缩强度和抗剪强度。不同种植间距对幼松木材力学性能的影响没有统计学意义。所研究的年龄对木材的表观密度没有影响。然而,将切割年龄从13年改为15年可显著提高木材的强度和刚度。在弯曲和平行压缩中,树木的生长特征与强度、刚度之间存在统计学上显著的相关性,约为0.500 R2,这表明该参数可以用来帮助估计这些特性。根据NBR 7190/97的要求,本研究使用的红松木材可分为结构木材,13年树龄为C20级,15年树龄为C25级和C30级。
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PHYSICO-MECHANICAL PROPERTIES AND GROWTH CHARACTERISTICS OF PINE JUVENILE WOOD AS A FUNCTION OF AGE AND PLANTING SPACING
ABSTRACT Pinus forests have been implanted in the South of Brazil since the 1960s in different spacing and harvested in shorter terms to increase wood yield. Reducing the rotation period and changing the spacing of forest plantations can influence the wood’s physical and mechanical properties, as they are younger trees that do not yet have a significant amount of mature wood in their composition. In this context, this research aimed to study the influence of three levels of planting spacing (3.0 × 2.0 m, 4.0 × 2.0 m, and 2.0 × 2.0 m) and two ages (13 and 15 years old) on growth characteristics and physical-mechanical properties of wood, as well as the relationship between them. Apparent density, latewood percentage, rings per inch, strength and stiffness in static bending as well as compression parallel to the grain, and shear strength were evaluated. The evaluated planting spacings did not cause statistically significant changes in the mechanical properties of juvenile Pinus taeda L. wood. The studied ages did not influence the wood’s apparent density. However, changing the cutting age from 13 to 15 years significantly increased the strength and stiffness of the wood. There was a statistically significant correlation between tree growth characteristics and strength, and stiffness in bending and parallel compression, around 0.500 R2, which suggests that this parameter can be used to assist in estimating those properties. The wood of Pinus taeda L used in this study can be classified as structural wood, class C20 for 13 years-old trees and classes C25 and C30 for 15 years-old trees, according to NBR 7190/97 requirements.
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来源期刊
Revista Arvore
Revista Arvore FORESTRY-
CiteScore
1.00
自引率
0.00%
发文量
32
审稿时长
4-8 weeks
期刊介绍: A Revista Árvore é um veículo de comunicação científica da Sociedade de Investigações Florestais – SIF. O jornal é de acesso gratuito, revisado por pares, que publica bimestralmente trabalhos científicos originais no campo da Ciência Florestal. As áreas temáticas para publicação são: Ambiência e Conservação da Natureza, Manejo Florestal, Silvicultura e Tecnologia da Madeira e Utilização de Produtos Florestais. A política editorial visa manter alta conduta ética em relação à publicação e aos seus funcionários, rigor na qualidade dos artigos científicos, seleção de revisores qualificados, respeito profissional aos autores e processo de tomada de decisão imparcial. A Revista Árvore publica artigos apenas em inglês. Artigos de revisão podem ser publicados se houver uma discussão relevante resumindo o estado da arte sobre o assunto. A revisão estrita da literatura não é aceita.
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