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过去我们讲过二氧化碳是植物光合作用不可缺少的物质,那么 co_2又是怎样进入植物体内的呢?原来扁平的叶片有上下两层表皮,表皮上都有非常多的小气孔。在一般情况下,下表皮的气孔比上表皮要多20%左右,这些气孔很小,直径只有几微米到几十微米,肉眼是看不见的。玉米每平方厘米的叶片表皮上就有2,000～3,000个气孔,虽然全部气孔
In the past we have talked about carbon dioxide is an integral part of plant photosynthesis, then co_2 is how to enter the plant body? The original flat leaves have two layers of epidermis, the epidermis has a lot of small pores. Under normal circumstances, the lower epidermis stomata than the upper epidermis about 20%, these stomata small, only a few microns to tens of microns in diameter, the naked eye is invisible. There are 2,000 to 3,000 stomata on the leaf epidermis per square centimeter of corn, although all stoma