在自然干旱条件下，梨树叶片气孔密度增大，而气孔相对开张度却变小。
Under natural drought condition, the density of stomata increased, but relative opening degree of stomata decreased.
比较测定了水、旱地梨树的叶片解剖构造、气孔分布密度与相对开张度、气孔传导率、蒸腾速率以及光合速率。
Anatomic construction, density and relative opening degree of stomata, stoma conductivity, transpiration rate, and photosynthetic rate of pear leaves of both irrigated and dry land were tested.
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