显微结构有不同程度的变化，在电子显微镜下可以看到纹孔膜发生破裂，木材的径切面上产生横向的裂纹；
Secondly , the microstructure of larch wood was changed to some extent , the observed changes by scanning electronic microscope were the pit membrane cracking and the cross crack on radial section of the specimen .
径切面