"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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Stoma (pl. stomata) One of a large number of pores in the epidermis of plants through which gaseous exchange occurs.

植物叶片表皮存在的数目众多的小孔，打开时允许气体自由出入进行交换。

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