Effect Of Electrical Stimulation On Negative Air Ions Release Of Euphorbiaceous Indoor Plants

The effect of high-voltage pulsed electrical stimulation on negative air ions (NAI) generation by pot plants in family Euphorbiaceae was surveyed. The main results are as follows:1. Variation in NAI levels of control groups and NAI levels generated by11species (or cultivars) of euphorbaceous pot plants under natural conditions11species(cultivars) of euphorbaceous pot plants were chosen and3treatment groups and1control group for each species (or cultivar) was design to determine and compared from each other about their NAI levels under natural situation in80×80×80cm3sealed spaces. Mean values of NAI levels in500s were determined and mean values were calculated for each species.NAI level in Codiaeum variegatum f. lobatum is the highest among11species(cultivars) of euphorbaceous pot plants and attained to439.00ion/cm3, which was5.24times as high as that in control group. And NAI level in Codiaeum variegatum f. taeniosum ’Graciosum’ is the lowest among11species(cultivars) of euphorbaceous pot plants and attained to48.00ion/cm3, which was1.37times as high as that in control group.ANOVA showed highly significant deference in NAI levels between species (or cultivar) of11species(cultivars) of euphorbaceous pot plants (P=0.00<0.01) and LSD multiple comparison showed that there were significant differences between species (or cultivar) of11species(cultivars) of euphorbaceous pot plants except Codiaeum variegatum and Euphorbia neriifolia var.cristata.2. Daily variations in NAI levels of6species(cultivars) of euphorbaceous pot plants under natural conditions6species(cultivars) of euphorbaceous pot plants were chosen and3treatment groups and1control group for each species (or cultivar) was design to determine and compared from each other about their NAI levels under natural situation in80×80×80cm3sealed spaces. Mean values of NAI levels over24hours were determined for each species.Daily variations in NAI levels showed time intervals at which peak values and valley values for6species(cultivars) of euphorbaceous pot plants appeared in the treatment group was inconsistent with those in the control groups. Not all plants released NAI at any time. The NAI level was lower in Codiaeum variegatum in the treatment group than that in the control group at10:00-11:00and15:00-16:00, Which indicated that it was absorbing NAI.And Codiaeum variegatum f. taenosum’Graciosum’indicated that it is absorbing NAI at all the time except at1:00-6:00and22:00-23:00.3. Variation in NAI levels in11species (cultivars) of euphorbaceous pot plants under electrostimulation conditions11species(cultivars) of euphorbaceous pot plants were selected and3treatment groups and1control group for each species (or cultivar) was design to determine and compared from each other about their NAI levels under electrostimulation conditions in80x80*80cm3sealed spaces. Pulsed Electric Field (pulse voltage15kV, frequence1s and pulse width50ms) was applied for electrostimulation. Mean values of NAI levels in500s were determined for each species.NAI levels in all11species (cultivars) of euphorbaceous pot plants are higher under electrostimulation conditions than those under natural conditions. Euphorbia sp. generated lowest NAI level under electrostimulation conditions and attained to44153.33ion/cm3, which was159.40times as high as that under natural conditions. Codiaeum variegatum f. taeniosum’Graciosum’generated highest NAI level under electrostimulation conditions and attained to1263206.33ion/cm3, which was26316.80times as high as that under natural conditions. ANOVA showed highly significant deference in NAI levels between species (or cultivar) of11species(cultivars) of euphorbaceous pot plants under electrostimulation conditions (P=0.00<0.01).4. Orthogonal design to optimize parameters of pulsed electric fieldsThree factors, namely pulse voltage, frequence and pulse width, were selected for orthogonal design to optimize the parameters of electrostimulation to generate highest NAI concentration. The optimal parameters of electrostimulation for11species (cultivars) of euphorbaceous pot plants are as follows:pulse voltage18kV, frequence0.5s and pulse width90ms for Codiaeum variegatum.pulse voltage15kV, frequence0.5s and pulse width90ms for Codiaeum variegatum f.lobatum. pulse voltage18kV, frequence0.5s and pulse width90ms for Codiaeum variegatum f.taeniosum’Graciosum’.pulse voltage15kV, frequence0.5s and pulse width90ms for Codiaeum variegatum f.crispum.pulse voltage11kV, frequence0.5s and pulse width35ms for Codiaeum variegatum f.cornutum ’PodorcarpLeaves.’pulse voltage15kV, frequence0.5s and pulse width90ms for Codiaeum variegatum f.platypHyllum.pulse voltage15kV, frequence0.5s and pulse width90ms for Euphorbia trigona.pulse voltage18kV, frequence0.5s and pulse width90ms for Euphorbia splendens.pulse voltage18kV, frequence0.5s and pulse width90ms for Euphorbia pulcherrima.pulse voltage18kV, frequence0.5s and pulse width90ms for Euphorbia neriifolia var. Cristata.pulse voltage18kV, frequence0.5s and pulse width90ms for Euphorbia sp.