Alevel阶段的生物课程需要大家兼顾理论和实践，在上篇中，小编为大家收集了Alevel生物的高频知识点，涵盖了所有有关碳循环的内容，例如定义、碳循环的分类，及其方程式示例等。本篇为碳循环的重要性和总体知识总结，中英对照的版本可供大家进行记忆和在论文写作中参考，一起来看看吧！

When organisms with calcium carbonate shells die, their body decomposes, leaving behind their hard shells. These accumulate on the seafloor and are eventually broken down by the waves and compacted under enormous pressure, forming limestone.

当具有碳酸钙外壳的生物体死亡时，它们的身体会分解，留下它们的硬壳。这些积累在海底，最终被海浪分解，在巨大的压力下被压实，形成石灰岩。

When these limestone rocks are exposed to air, they get weathered and the carbon is released back into the atmosphere as carbon dioxide.

当这些石灰岩暴露在空气中时，它们会被风化，碳会以二氧化碳的形式释放回大气中。

Importance of Carbon Cycle 碳循环的重要性

Even though carbon dioxide is found in small traces in the atmosphere, it plays a vital role in balancing the energy and traps the long-wave radiations from the sun. Therefore, it acts like a blanket over the planet. If the carbon cycle is disturbed it will result in serious consequences such as climatic changes and global warming.

尽管二氧化碳在大气中的痕迹很小，但它在平衡能量和捕获来自太阳的长波辐射方面起着重要作用。因此，它就像地球上的一条毯子。如果碳循环受到干扰，将导致严重后果，如气候变化和全球变暖。

Carbon is an integral component of every life form on earth. From proteins and lipids to even our DNA. Furthermore, all known life on earth is based on carbon. Hence, the carbon cycle, along with the nitrogen cycle and oxygen cycle, plays a vital role in the existence of life on earth.

碳是地球上每个生命形式的一个组成部分。从蛋白质和脂质到甚至我们的DNA。此外，地球上所有已知的生命都以碳为基础。因此，碳循环与氮循环和氧循环一起，在地球上的生命存在中发挥着重要作用。

What is the carbon cycle? Explain. 什么是碳循环？解释一下。

Carbon Cycle is a biogeochemical cycle where various carbon compounds are interchanged among the various layers of the earth, namely, the biosphere, geosphere, pedosphere, hydrosphere and atmosphere.

碳循环是一种生物地球化学循环，各种碳化合物在地球各层，即生物圈、地圈、土壤圈、水圈和大气中相互交换。

What are the 4 steps of the carbon cycle? 碳循环的4个步骤是什么？

· Carbon enters the atmosphere as CO2

· CO2 is absorbed by autotrophs such as green plants

· Animals consume plants, thereby, incorporating carbon into their system

· Animals and plants die, their bodies decompose and carbon is reabsorbed back into the atmosphere.

- 碳以二氧化碳的形式进入大气层

- 二氧化碳被绿色植物等自生植物吸收

- 动物食用植物，从而将碳纳入其系统中

- 动物和植物死亡，它们的身体分解，碳被重新吸收回大气中。

What are the types of the carbon cycle? 碳循环的类型有哪些？

Carbon Cycle can be classified into two types based on the duration of the process into two types 碳循环可以根据过程的持续时间分为两种类型：

Short term – This type occurs within a relatively short period of time. It is named as such because it takes just days, months or years for carbon to flow across the various carbon reservoirs.

短期--这种类型发生在一个相对较短的时间段内。之所以这样命名，是因为碳在各个碳库中的流动只需要几天、几个月或几年。

Long term – This type takes thousands of years to occur. The excess carbon from the short-term cycle is stored for a long time before they are released.

长期--这种类型需要几千年的时间才能发生。短期循环中多余的碳在它们被释放之前被储存了很长一段时间。

Why is the carbon cycle important? 为什么碳循环很重要？

Carbon Cycle is an important aspect of the survival of all life on earth. From an environmental perspective, carbon provides insulation by trapping the sun’s heat. From a biological perspective, carbon is the building block of life and forms stable bonds with other elements necessary for life.

碳循环是地球上所有生命生存的一个重要方面。从环境的角度来看，碳通过捕获太阳的热量来提供绝缘。从生物角度看，碳是生命的组成部分，并与生命所需的其他元素形成稳定的结合。

以上是小编为大家总结的Alevel生物高频考点碳循环，希望对大家有所帮助，祝各位同学学业有成金榜题名！如有更多Alevel辅导的需要，欢迎联系在线客服老师，会获得更专业的指导~