The stomatal resistance is small in the period of jointing-booting and earlier ear sprouting-boom, but it reaches the peak in the period of later ear sprouting-boom and milk.

• 全生育期气孔阻力变化规律呈现多峰曲线，拔节孕穗期和抽穗开花前期气孔阻力值较小，而抽穗开花末期和乳熟期出现峰值。