气干材：长期贮存于大气中，与大气的相对湿度趋于平衡的木材。其含水率取决于周围环境的温度和相对湿度，一般在8%~20%之间，我国国标把气干材平均含水率定为12%。
用X射线扫描密度计测量气干材含水率及其每一年轮的水分分布。
In this paper, the moisture content and its distribution of each growth ring in air dried wood specimens have been tested by using X-ray scanning densitometer.
在物理力学性质指标中成熟材的基本密度、气干密度、顺纹抗压强度、抗弯强度、抗弯弹性模量及冲击韧性高于幼龄材；
In physical and mechanical indexes, the basic density, air-dried density, compression strength parallel to grain, MOR, MOE and toughness of mature wood are higher than that of juvenile wood.
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