Research on the Characteristics of Photosynthetic Diurnal Variations of Five Dwarf Bamboos

We investigated diurnal variations of photosynthesis of pot-grown dwarf bamboos.We discovered that their net photosynthetic rate and transpiration rate exhibited two peaks in the curves of diurnal changes and obvious phenomena of midday depression.Environmental factors affected net photosynthetic rate by affecting available photosynthetic radiation,water deficit,intercellular CO2 concentration and leaf temperature.Stomatic conductance affected the variations of photosynthetic characteristic parameters,which was critical to net photosynthetic rate.Decrease of stormic conductance caused the depression of net photosynthetic rate which was regulated by stomatal factors.