The effects of brown-rot decay on select wood properties of poplar (Populus cathayana Rehd.) and its mechanism of action
The effects of brown-rot decay on select wood properties of poplar (Populus cathayana Rehd.) and its mechanism of action
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DOI：
10.1515/hf-2016-0150
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发表时间：
2017-04
期刊：
影响因子：
2.4
通讯作者：
Xiao-wen Ge;Lihai Wang;J. Hou;Binbin Rong;X. Yue;Shengming Zhang
中科院分区：
文献类型：
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作者：
Xiao-wen Ge;Lihai Wang;J. Hou;Binbin Rong;X. Yue;Shengming Zhang
摘要：研究了褐腐对青杨（Populus cathayana Rehd.）木材力学和化学性质的影响，同时对几种性质与腐朽程度以及它们之间的相关性进行了量化。在腐朽过程中，冲击弯曲强度（IBS）和抗弯强度（MOR）的损失随腐朽程度呈对数增加，而弹性模量（MOE）和平行于纹理的抗压强度（CS∥）的损失则呈线性缓慢增加。四种力学参数对腐朽响应速度和腐朽影响程度的排序为：IBS > MOR > MOE > CS∥。半纤维素优先被褐腐真菌分解。纤维素的显著降解始于18.7%的质量损失（WL），此时相对结晶度降低。总之，半纤维素的降解导致IBS快速且显著下降，随后非晶态纤维素的去除导致MOR损失。MOE的变化与纤维素含量相关。CS∥的下降是由于结晶纤维素的缓慢劣化。
Abstract The effects of brown-rot decay on the mechanical and chemical properties of poplar (Populus cathayana Rehd.) wood were investigated, while the correlation of several properties to the decay degree and to each other were quantified. During the decay process, the losses in impact bending strength (IBS) and modulus of rupture (MOR) increased logarithmically with the degree of decay, whereas the losses in modulus of elasticity (MOE) and compressive strength parallel to grain (CS∥) increased slowly with linear trends. The ranking of the four mechanical parameters for the response speed to decay and the degree of the influence of decay were IBS>MOR>MOE>CS∥. Hemicelluloses were preferably decomposed by the brown-rot fungus. The prominent degradation of cellulose began from a weight loss (WL) of 18.7%, where the relative crystallinity decreased. In summary, the degradation of hemicelluloses caused a fast and significant decrease in IBS while the subsequent removal of paracrystalline cellulose resulted in MOR loss. The variation of MOE was in correlation with the cellulose content. A decrease in CS∥ was due to the slow deterioration of crystalline cellulose.