利用SilvilScan-3测定瓜多竹气干密度

Air-dry Density of Guadua amplexifoli Bamboo Measured by SilvilScan-3

利用SilviScan-3测定了瓜多竹竹材的气干密度,并与常规方法的测定值进行了比较分析,以揭示瓜多竹气干密度的变异规律。SilviScan-3和常规方法测定值差异不显著,也具有较强的线性相关性,决定系数（R2）为0.90。SilviScan-3测定的瓜多竹气干密度平均值为0.520 g.cm-3,分布范围为0.2391.165 g.cm-3;常规方法测定的平均值为0.604 g.cm-3,分布范围为0.4500.983 g.cm-3。与常规方法相比,SilviScan-3能连续、快速测定,更适合用于研究竹材气干密度的径向变化。按SilviScan-3方法测定结果,瓜多竹气干密度纵向变化规律为：基部小于中部,中部小于稍部;从竹壁内壁到竹壁厚度1/3处,气干密度缓慢增加,自竹壁厚度1/3处至竹壁外壁,气干密度增加幅度较大。

To investigate the air-dry density variation with respect to positions along longitudinal direction（bottom,middle and top of culm） and radial direction（from inner part to outer part of culm wall） of G.amplexifolia,air-dry density was measured by SilviScan-3 and normal method.There was no significant difference between air-dry density measured by SilviScan-3 and normal method.Ditermination coefficient of correlation was 0.90.The average air-dry density measured by SilviScan-3 and normal method were 0.520 g·cm-3 and 0.604 g·cm-3 respectively,and varied from 0.239 g·cm-3 to 1.165 g·cm-3 and from 0.450 to 0.983 g·cm-3.Compared with normal method,SilviScan-3 provided a continuous and more rapid method for determining air-dry density variation in bamboo culm.According to results of SilviScan-3,air-dry density in bottom was lower than that of in middle which was lower than that of in top of culm;air-dry density increased gradually from inner later to one third of clum wall thickness and then increased rapidly to outer layer.