水稻植株释放负离子研究

Generation of negative air ions by rice plants

脉冲电场作用下对丰两优1号(r1)等6个水稻品种释放负离子的浓度特性进行研究.结果表明:在自然状态下,6个水稻品种的植株释放负离子的能力很弱,负离子浓度最高为特优420(22 ion·cm-3),最低为冈优527(15 ion·cm-3).适当的脉冲电场刺激水稻根部,6个水稻品种较常态下释放负离子的能力均大幅度提高,以脉冲电场u2(脉冲电压15 kV,脉冲频率1 Hz,脉冲宽度50 ms)的效果最大,释放负离子浓度最高为冈优527(r2),达4168100 ion·cm-3,是对照组刺激无水稻植株的土壤(r7)的24959倍,是自然状态下(未刺激)的208405倍;最低为糯广优201(r3),为2786000 ion·cm-3,是对照组刺激无水稻植株的土壤(r7)的16683倍,是自然状态下(未刺激)的139300倍.以同一强度脉冲电场对不同生长期的水稻进行刺激,以四叶期的释放量最大,抽穗期阶段均出现下降趋势.

In the pulse electric field the characteristics of rice （Fengliangyou 1, Gangyou 527, Nuoguangyou 201, Teyou 420, Yongyou 9, Zhongzheyou 8） to generate different concentrations of negative air ions were investigated. The results showed as fol- lows. Rice generated low amounts d negative air ions under natural conditions. The capacity of Teyou 420 generating negative air i- ons was the maximum among the above six varieties, with a day average of the concentration 22 ion ·cm^-3, while the minimum was generated by Gangyou 527 with the concentration 15 ion ·cm^-3. When proper pulse electric field stimulations were applied to roots, the ability of six rice varieties to generate negative air ions was greatly improved in comparison with those under normal conditions. The effect of pulse electric field u2 （average voltage during the pulse period U = 15 kV, pulse frequency f= 1 Hz, pulse duration ＇r = 50 ms） was the greatest. In the role of pulse electric field u2, the mean negative air ions concentration generated by Gangyou 527 was the highest one,4168100 ion ~ cm-3, 24959 times higher than the control group soil （without rice plants） and 208405 times higher than the control group under natural conditions （unstimulated）, while the lowest concentration of negative air ions was gener- ated by Nuoguangyou 201 with the value 4168100 ion ~ cm^-3, 16683 times higher than the control group soil （without rice plants） and 139300 times higher than the control group under natural conditions （unstimulated）. With the same intensity pulse electric field on the different growth stages of rice to stimulate, the capacity to generate at four-leaf stage was the largest and at heading stage be- gan to follow a downward trend.