【摘要】 本文对大兴安岭林区产白桦、枫桦和黑桦的宏观构造、微观构造、纤维形态、物理力学性能、化学性质进行了比较研究。研究结果表明三种桦木结构相似，材性相近，枫桦力学强度稍大，黑桦、枫桦纤维形态较好。更多还原

【Abstract】 This paper sttidy on the gross structure.Microscopic structure. Fibre state,physical andstrength properties.Chemical properties,and compare with eachother.It isshowed that the three kinds of birch are simllar in structure,hardly same in characteristics,but costaI trautv’s strength is larger than others.DahtJrica pall and coastaI Trautv’s fiberstate are better than plantyphylla suk.更多还原