一种植物叶的单位面积上气孔数与表皮细胞数的比例有一定的范围且较恒定，这种比例关系称为气孔指数。 测定气孔指数常用来区别不同的植物和叶类中药
上表皮气孔指数的变化规律不明显；
The stomatal index in the adaxial epidermis changed variably during development of cotyledons.
气孔指数在各器官上的变化规律差异较大。
Stomatal index in the epidermis of different organs changed variably during the developmental stages.
统计并测量叶表皮气孔大小、气孔密度及气孔指数。
The stomatal size , density and index were measured and counted .
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