冲击加载对植物种子萌发率的影响

Effect of Shock Compression on Germination Rate of Plant Seeds

为分析冲击加载对植物种子萌发率的影响,利用轻气炮加载装置,对2种典型植物种子(苜蓿草种子和萝卜种子)进行飞片撞击实验。采用非显性有限元分析软件ANSYS AUTODYN,模拟盖板的变形以及冲击波在凹槽内的传播。通过测定实验后收集到的植物种子的萌发率,得到苜蓿草种子和萝卜种子的萌发率随峰值压力变化的关系。在385MPa的峰值压力作用下,苜蓿草种子和萝卜种子的相对萌发率分别降为65.4%和6.1%。分析表明,实验中的种子破损是影响萌发率的次要原因。

The influence of shock compression on the germination rate of plant seeds was investigated experimentally by a light gas gun and numerically by finite element method. The deformation of cover- plate and the shock wave propagation in groove were simulated by ANSYS AUTODYN. The germina- tion rates of two kinds of plant seeds （alfalfa and turnip） were assayed after experiments,and the ex- perimental results indicated the different sensitivity of these two seeds and the relationship between germination rate and peak pressure. At the peak pressure of 385 MPa,the relative germination rates of alfalfa and turnip seeds were decreased to 65.4% and 6. 1%, respectively. Different type of damage seeds were observed by a scanning electron microscope. It is believed that the damage is only a minor factor for germination rate of plant seeds.