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Biology

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Biology

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Ecosystems

Carbon Movement in Living Systems

Description

Carbon moves through living systems and Earth over short and long time scales. It is the basis of all organic matter on Earth, and it cycles through ecosystems by passing between organisms and by moving through rocks, oceans, and the atmosphere. Human activities, including farming and burning fossil fuels, have changed this ...

Transcript

在碳循环中

碳原子能在整个生态系统移动

从光合作用开始 如植物等的自养生物

能将空气中的碳原子

以二氧化碳形式转化成

能被异养生物吸入的可消耗能源

这类生物会通过呼吸将

二氧化碳排放到空气中

或通过分解将之释放到土壤中

空气中的二氧化碳

容易溶解于水

因此海洋是碳的主要储藏库

二氧化碳与水产生的反应会先形成碳酸

再形成碳酸离子

海水中的碳酸钙

可用于构造珊瑚骨骼和软体动物贝壳

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