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Influence of pulsed electrical fields on generation of negative air ions by plants and its mechanism.

WU Ren-ye1,2, ZHENG Jin-gui2*, WENG Hai-yong2, ZHANG Wan-chao3, DENG Chuan-yuan3, YE Da-peng4, WANG Qing-shui2, SUN Yuan-fen2#br#   

  1. (1Ministry of Education Key Laboratory for Crop Genetics, Breeding and Multiple Utilization of Crops, College of Crop Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 2 Fujian Engineering Technology Research Center of Breeding and Utilization for Special Crops, Fuzhou 350002, China; 3College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou 350002, China; 4College of Mechanical and Electronic Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China).
  • Online:2017-05-10 Published:2017-05-10

Abstract: In natural condition, the capacity of plants to generate negative air ions (NAIs) is very weak. However, a pulsed electrical field can result in a substantial improvement of the capacity in NAI generation. To investigate the mechanism underlying NAI generation by plant following the pulsed electrical field stimulation, the present study examined the generation of NAI in Clivia miniata, Echinocactus grusonii, and Chlorophytum comosum among the ten tested plant species (Guzmania lingulata etc) in the  presence of a pulsed electrical field, which possess strong capacity of generating NAI under natural conditions. The results showed that various parameters of pulsed electrical field affected the generation of NAI in the plants. Each plant had its own optimal pulsed electrical field with combination of parameters for the efficient generation of NAI: C. miniata with A4B4C4 (A4,U = 2.0×104 V; B4, T=2.0 s; C4, τ=90 ms), E. grusonii with A4B1C3 (A4, U=2.0×104 V; B1, T=0.5 s; C3, τ = 65 ms) and C. comosum with A3B1C2 (A3,U=1.5×104 V; B1, T=0.5 s; C2, τ=35 ms). With the application of a pulsed electrical field to a plant, the higher voltage in the plant, the greater capacity of NAI generation was (P<0.05). With the enhancement of light intensity, the ability of the plant to generate NAI significantly increased (P<0.05). A plant’s capacity of NAI generation was closely related to the characteristics of leaf stomata. Greater degree of stomatal opening and stomatal density facilitated a stronger ability of the plant to generate NAI (P<0.05). In sum, these results suggested that NAI generation by plants was a complex physiological process that was influenced by several factors, including the presence of pulsed electrical field stimulation, light intensity, and plant characteristics.

Key words: soil heavy metal, semi-variance, paddy field, spatial variation, correlation analysis., soil nutrient, kriging interpolation