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超声声速可用来研究谷类茎部组织的发育。通过脉冲波在茎轴线方向上的传播,测量了频率为0.1MHz的纵波声速。样品是薄圆筒,它是在植物生长过程中每3—7天从植物的同一节间位置得到的。植物从生长到成熟过程中,其超声声速由400m/s增加到5000m/s。声速的变化决定于组织发育的不同阶段,厚膜组织中微原细胞纤维素的沉积和细胞壁中生理水的损失对声速的影响最为明显。脉管束纤维的木质化过程将引起脉冲声速的微小变化。由于茎部的发育程度与声速
Sonic velocity can be used to study the development of cereal stem tissue. By the propagation of the pulse wave in the direction of the stem axis, the velocity of the longitudinal wave at a frequency of 0.1 MHz was measured. The sample is a thin cylinder that is taken from the same internode position of the plant every 3-7 days during plant growth. From the plant growth to maturity, its ultrasonic speed increased from 400m / s to 5000m / s. The change of sound velocity depends on the different stages of tissue development. The deposition of micropropagated cellulose and the loss of physiological water in the cell wall affect the sound velocity most obviously. The lignification of vascular bundles will cause small changes in pulse sound velocity. Due to the degree of development of the stem and the speed of sound