生物腐朽对湿地松木材力学性质影响的研究

Effects of biological decay on mechanical properties of slash pine wood

由于生物腐朽可以引起木材结构的严重破坏,采用不同菌种和不同生物腐朽时间对湿地松木材的最大工作荷载(WML)、抗弯弹性模量(MOE)和抗弯强度(MOR)等力学性质的影响进行了研究。结果表明:白腐菌、褐腐菌2个菌种和腐朽时间都对木材力学性质的影响显著(α=0.05),其中白腐菌处理对木材力学性质的影响很小,而褐腐菌处理木材对木材力学性质的影响很大。腐朽木材失重率与各项力学性质之间的相关性分析表明:木材失重率与WML、MOE和MOR之间都呈显著负相关。褐腐试验的相关性均在α=0.01水平时显著(双尾检验),皮尔森相关系数达到-0.937以上;而白腐试验的相关性均在α=0.05水平时显著(双尾检验),皮尔森相关系数达到-0.788以上。

Biological decay can cause severe damage to wood structures.The effect of decay fungi and exposure time on work to maximum load（WML）,modulus of elasticity（MOE） and modulus of rupture（MOR） of slash pine（Pinus elliottii） wood was investigated in this study.The results of analyses of variance show that the effect of fungi species and exposure time on the mechanical properties of wood were significant（at the 0.05 level）.The reduction in mechanical wood properties caused by white-rot decay（Trametes versicolor） was not significant,whereas brown-rot decay（Gloeophyllum trabeum） caused a significant reduction in mechanical properties.A correlation analyses showed that there was significant negative correlation between weight loss and mechanical properties of decayed wood.The correlation between brown-rot decay treatment and mechanical properties was significant at the 0.01 level（2-tailed test） with a Pearson correlation coefficient of-0.937.The correlation of white-rot decay treatment with mechanical properties was significant at the 0.05 level（2-tailed test） with a Pearson correlation coefficient of about-0.788.