How does decomposition contribute to the carbon cycle?

Decomposition plays a key role in the carbon cycle by returning carbon from dead organisms back into the environment.

When plants and animals die, their bodies contain carbon in the form of organic compounds such as carbohydrates, proteins, and fats. Decomposers like bacteria and fungi break down these compounds during decomposition.

In aerobic conditions, carbon is released into the atmosphere as carbon dioxide through microbial respiration. In anaerobic conditions, decomposition may produce methane, another carbon-containing gas.

The released carbon dioxide is then utilized by plants during photosynthesis to produce food, completing the carbon cycle. Some carbon may also remain in the soil as humus, contributing to soil organic matter.

Thus, decomposition ensures the continuous movement of carbon between living organisms, the atmosphere, and the soil, maintaining balance in the carbon cycle.