简述大气的生态作用。 -题库考试答案搜索网

简述大气的生态作用。

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2022-03-03 10:37

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正确答案

大气的生态作用主要是氧和二氧化碳及风对生物的作用。氧，主要由植物光合作用产生，少部分来源于大气层的光解作用。高层大气中的氧分子在紫外线作用下与高度活性的氧原子结合生成臭氧，保护了地面生物免遭短波宇宙射线的伤害。二氧化碳则是植物光合作用的主要原料。氧和二氧化碳的平衡是生态系统能否进行正常运转的重要因素，而植物在调节大气中氧和二氧化碳的平衡过程中起重要作用。

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标签：大学试题农学

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