脉冲电场作用对植物释放负离子的影响

Negative air ions generated by plants upon pulsed electric field stimulation applied to soil

在脉冲电场作用下对蟹爪兰等10种植物释放负离子的能力进行研究.结果表明:在自然状态下,10种植物释放负离子的能力很弱,吊兰和绯牡丹的24 h浓度均值最高,为43ion·cm-3,金边龙舌兰最低,为19 ion·cm-3,当适当强度的脉冲电场作用在植物的根际土壤时,10种植物较自然状态下(未刺激)释放负离子的能力均大幅提高,以脉冲电压2.0×104V、脉冲频率1 Hz、脉冲宽度50 ms的脉冲电场效果最佳,10种植物中释放负离子浓度最高的为寒兰,达1454967 ion·cm-3,是自然状态下的48498.9倍;最低为蟹爪兰为34567 ion·cm-3,是自然状态下的843.1倍.在不同强度脉冲电场作用下,植物释放负离子的能力差异显著.

This paper investigated the capacity of plants （Schlumbergera truncata, Aloe vera var. chineusis, Chlorophytum comosum, Schlumbergera bridgesii, Gymnocalycium mihanovichii var. friedrichii , Aspidistra elatior , Cymbidium kanran , Echinocactus grusonii , Agave americana var. marginata, Asparagus setaceus ） to generate negative air ions （NAI） under pulsed electric field stimulation. The results showed that single plant generated low amounts of NAI in natural condition. The capacity of C. comosum and G. mihanovichii vat. friedrichii generated most NAI among the above ten species, with a daily average of 43 ion · cm-3. The least one was A. americana var. mar- ginata with the value of 19 ion · cm-3. When proper pulsed electric field stimulation was applied to soil, the NAI of ten plant species were greatly improved. The effect of pulsed electric field u3 （ aver- age voltage over the pulse period was 2.0×104 V, pulse frequency was 1 Hz, and pulse duration was 50 ms） was the greatest. The mean NAI concentration of C. kanran was the highest 1454967 ion · cm-3 which was 48498.9 times as much as that in natural condition. The lowest one was S. truncata with the value of 34567 ion · cm-3 which was 843.1 times as much as that in natural condition. The capacity of the same plants to generate negative air ion varied extremely under differ- ent intensity pulsed electric fields.