一、前言在~(60)—γ射线对马尾松木材改性研究的基础上,我们对马尾松木材的超微结构、纤维素结晶度、自由基等进行了深入的研究。木材的结晶度关系到木材的主要力学性质,是研究木材的重要参数;分析木材的超微结构,可以直接了解木材组成上的变化;木材自由基的变化,从纤维素分子结构上可看出辐射对木材结构的影响。这几方面的研究,将有助子对马尾松木材材性的分析。二、材料与方法试验用材样木5株,采自福建南平西芹,为成熟的马尾松茎干,树龄69—82年,总材积10m~3。根据国家木材物理力学试验方法 I. Introduction On the basis of ~ (60) -γ ray modification of Pinus massoniana wood, we conducted an in-depth study on the ultrastructure of wood, cellulose crystallinity, free radicals and so on. The crystallinity of wood relates to the main mechanical properties of wood and is an important parameter for the study of wood. Analyzing the ultrastructure of wood can directly understand the changes in wood composition. The changes of wood free radicals can be seen from the molecular structure of cellulose Effects of radiation on wood structure. These aspects of research, will help the analysis of wood quality of masson pine. Second, materials and methods Test sample wood 5, collected from Fujian Nanping celery, mature Pinus massoniana stems, aged 69 to 82 years, the total volume of 10m ~ 3. According to the national timber physical and mechanical test methods