Class 12 Biology Ecosystem Carbon cycle

Carbon cycle

Carbon constitutes of 49% of dry weight of organisms.

4x1013 kg of carbon is fixed in the biosphere by photosynthesis.

Large amount of carbon returned to the atmosphere as carbon di oxide through respiration of producers and consumers.

Decomposers also return carbon dioxide to reservoir during decomposition process.

Some amount of carbon is lost to sediments and removed from circulation.

Burning wood, forest fire, combustion of organic matter, fossil fuel also release carbon dioxide to atmosphere.

Rapid deforestation and massive burning of fossil fuel for energy and transport have significantly increased the rate of release of carbon dioxide into the atmosphere.

 

Fig. the carbon cycle  

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