Log characteristics and basic density of four common Mongolian softwoods

IF 1.3 Q2 MATERIALS SCIENCE, PAPER & WOOD International Wood Products Journal Pub Date : 2022-02-08 DOI:10.1080/20426445.2022.2036932

Murzabyek Sarkhad, F. Ishiguri, I. Nezu, Bayasaa Tumenjargal, Yusuke Takahashi, Bayartsetseg Baasan, Ganbaatar Chultem, J. Ohshima, S. Yokota

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Abstract

ABSTRACT Log characteristics and basic density were evaluated in four common Mongolian softwoods, Pinus sylvestris L., Pinus sibirica Du Tour, Picea obovata Ledeb., and Larix sibirica Ledeb. by developing the linear or nonlinear mixed-effects models for longitudinal and radial variations of measured characteristics. Total of 19 trees from four species were used in this study. Log taper and juvenile wood percentage increased from base to treetop in all species, except for log taper in Pinus sylvestris. Dynamic young’s modulus of logs decreased from base to treetop, and the mean values were 7.81, 5.74, 7.12, and 8.78 GPa for Pinus sylvestris, Pinus sibirica, Picea obovata, and Larix sibirica, respectively. Basic density increased (Pinus sylvestris and Larix sibirica) or decreased (Pinus sibirica and Picea obovata) and then became stable values. The estimated whole tree values of basic density in juvenile wood significantly differed from those in mature wood for all species.

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四种常见蒙古软木的木材特性及基本密度

摘要对4种常见蒙古针叶松、西伯利亚松和黄云杉的原木特征和基本密度进行了评价。和西伯利亚落叶松。通过建立测量特性纵向和径向变化的线性或非线性混合效应模型。本研究共使用了4个树种的19棵乔木。除西洋松(Pinus sylvestris)的原木锥度和幼材率外，所有树种的原木锥度和幼材率均由基部向树梢增加。原木动态杨氏模量从基部到树梢依次递减，平均值分别为7.81、5.74、7.12和8.78 GPa，分别为柴油松、西伯利亚松、云杉和西伯利亚落叶松。基本密度增加(针叶松和西伯利亚落叶松)或减少(西伯利亚松和云杉)后趋于稳定。各树种幼木的全树基本密度估计值与成熟木的全树基本密度估计值存在显著差异。

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International Wood Products Journal MATERIALS SCIENCE, PAPER & WOOD-

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