What is the use of stomatal index?

The stomatal index is a measure used to quantify the density of stomata (pores) on a leaf surface relative to the total number of epidermal cells. It is useful in assessing plant responses to environmental conditions, such as changes in atmospheric CO2 levels, and can indicate adaptations to different habitats. Additionally, the stomatal index is employed in paleobotany to infer past climates by examining fossilized plant material. This metric helps researchers understand plant physiology and ecosystem dynamics over time.