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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 ...
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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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