"The increase in carbon dioxide by about 100 parts per million has had a profound effect on the number of stomata and, to a lesser extent, the size of the stomata, " Dilcher said.

Dilcher说：“二氧化碳在大气中的含量每增加万分之一就会对植物气孔的数量产生深远的影响，同时还会使气孔的宽度变窄。”

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The size and density of stomata are of negative correlation.

气孔大小与密度成负相关。

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This study consists of 8 species, 28 cultivars, and the density and size of the stomata were measured.

本研究包括8个种，28个品种类型，测定了气孔密度和大小。

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