密粘褶菌生物性降解对杉木木材性质的影响

Wood properties of Chinese-fir after biological degradation by Gloeophyllum trabeum(Pers.) Murrill

选用密粘褶菌(Gloeophyllum trabeum(Pers.)Murrill)对杉木(Cunninghamia lanceolata(Lamb.)Hook.)木材进行生物性降解,研究不同降解时间对杉木木材化学成分、结晶度、微力学性能和微观形态的影响。结果表明,密粘褶菌不降解杉木木材的木质素,其中边材综纤维素、纤维素和半纤维含量在6周分别降低了6.91%、4.07%和13.34%;心材综纤维素、纤维素和半纤维含量在6周分别降低了6.84%、4.09%和12.97%。木腐菌处理后,杉木木材纤维素结晶度均有所降低;杉木的抗弯强度和抗弯弹性模量均呈现减小的趋势,18周时降到最低,杉木边材抗弯强度减少了46.17%,抗弯弹性模量减小了29.66%,心材抗弯强度减少了53.74%,抗弯弹性模量减少了47.74%。

In this research, we studied the effect of degradation time on chemical component, crystallinity, micro-mechanical properties, and micromorphology when using Gloeophyllum trabeum to degrade Chinese-fir. The result showed that Gloeophyllum trabeum did not degrade Chinese-fir＇s lignin. The mass fractions of holocellulose, cellulose, and hemicellulose in sapwood decreased by 6.91%, 4.07%, and 13.34%, and those in heartwood decreased by 6.84%, 4.09%, and 12.97% at the 6th week. After treated with wood rot fungi, the cellulose crystallinity, MOR, and MOE decreased and reached the minimum value at 18 th week. The MOR and MOE of sapwood, and the MOR and MOE of the heartwood decreased by 46.17% and 29.66%, 53.74% and 47.74%, respectively.