stomatal index

例句：

1. 1.The plant's stomatal index is a key indicator of its health and growth.
   植物的气孔指数是其健康和生长的关键指标。
2. 2. The stomatal index in the leaves of this species has been found to be higher than that in other species.
   这种物种叶片的气孔指数比其他物种高。
3. 3. The stomatal index can be used to predict the yield of crops, as it is closely related to the amount of photosynthesis.
   气孔指数可以用来预测作物产量，因为它与光合作用的数量密切相关。