土壤干旱条件下不同施钾水平对烟草光合速率和蒸腾效率的影响

Effect of potassium on tobacco photosynthesis and transpiration efficiency under soil drought stress and different potassium supplied

研究了土壤干旱条件下 ,不同的施钾水平对烟草光合速率、胞间 CO2 浓度、气孔导度、蒸腾速率、蒸腾效率及生物量的影响。结果表明 :在土壤干旱条件下适量施钾可以减少叶肉细胞光合活性的下降 ,消弱非气孔因素对光合的限制 ,增强气孔调节能力 ,提高蒸腾效率 ,并获得较高的生物量。

The experiment of the effect of different potassium supplied on tobacco photosynthesis rate,intercelluar CO 2 content,stomatal conductance,transpiration rate,transpiration efficiency,and biomass under soil drought was carried out in pots.The results showed:The decrease of mesphylls photosynthetic action was reduced by appropriate potassium supplied,and non stomatal inhibition of photosynthesis was also reduced.The adjustive capability of stomatal and transpiration efficiency were improved by appropriate potassium supplied,and got higher biomass.