Bai Yueming, Wang Chunyi, Wen Min, et al. Experimental study of single and interactive effects of double CO2, O3 concentrations on soybean. J Appl Meteor Sci, 2003, 14(2): 245-251.
Citation: Bai Yueming, Wang Chunyi, Wen Min, et al. Experimental study of single and interactive effects of double CO2, O3 concentrations on soybean. J Appl Meteor Sci, 2003, 14(2): 245-251.

EXPERIMENTAL STUDY OF SINGLE AND INTERACTIVE EFFECTS OF DOUBLE CO2, O3 CONCENTRATIONS ON SOYBEAN

  • Received Date: 2002-03-21
  • Rev Recd Date: 2002-07-19
  • Publish Date: 2003-04-30
  • The single or interactive effects of double CO2 and O3 concent rations on soybean (Gly cine max L.Merr.) are investigated for first time by using a soybean cultivars, Zhonghuang-14, in an open-top chamber.Cont rasting to the control, the effects of doubled CO2 concentration alone on soybean biomass, yield, legumen bunches, legumen numbers, grain numbers and weight are posit ive, but the effects of doubled O3 concent ration alone on the above parameters are obviously negative; and the longer the ventilation time periods are, the more obvious the effects are.When both CO2 and O3 concentrations are doubled, their interaction shows that the effect of CO2 is greater than that of O3.In the process of CO2 and O3 concentrations increasing gradually, the negative O3 effect approached the posi tive CO2 effect eventually because of the gradually cumulating O3 concent ration and gradually increasing stimulation.The doubled O3 concent ration alone suppresses photosynthetic products into the soybean roots and grains, but increases those into soybean stems and leaves, resulting in the reduced root/shoot ratio (RSR) and grain/culm ratio (GCR).The long-period effect reduces Harvest Index (HI) and increases Leaf Weight Ratio (LWR) markedly.With the ventilation time prolonged the effects are more remarkable.The interactive effects of doubled CO2 and O3 concentrations on the RSR、LWR、GSR and HI are relatively slight, only within±10%.
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    • Received : 2002-03-21
    • Accepted : 2002-07-19
    • Published : 2003-04-30

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