有些木材,由于它本身构造的原因,在干燥过程中翘曲、开裂,变形很大,如刺槐、枫香、落叶松等;有的木材易受虫蛀,如臭椿、马尾松等;有的易变色和腐朽,如杨木、桦木等。上述这些缺点严重影响扩大树种利用。我国广大的劳动人民在防止木材翘裂、虫蛀和腐朽方面具有非常丰富的实践经验,创造了许多木材改性的好方法。经过河南、山东和山西三 Some wood, because of its own construction reasons, in the drying process of warping, cracking, deformation, such as acacia, sweetgum, larch, etc .; some wood susceptible to insects, such as Ailanthus altissima, Masson; some Easy discoloration and decay, such as poplar, birch and so on. These shortcomings as mentioned above seriously affect the expansion of tree species utilization. The vast working people in our country have a wealth of practical experience in preventing the cracking, moth-eaten and decaying of wood, and have created many good methods of wood modification. After Henan, Shandong and Shanxi three