The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.

The carbon cycle is thought of including the following major reservoirs of carbon: the atmosphere, the terrestrial biosphere, the oceans, the sediments and the Earth's interior.

The carbon cycle is one of the most important cycles of the Earth and allows for carbon to be recycled and reused throughout the biosphere and all of its organisms.

碳循环是一个生物地质化学循环圈，碳通过此循环在生物圈、土壤圈、地层、水圈、大气中交流。

碳循环一般包括以下几个主要的碳储藏所：大气、陆地生物圈、海洋、沉积物以及地球内部。

碳循环是地球最重要的循环之一，它使碳在整个生物圈及其所有有机体中得到循环和重复利用。