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The soil is a major reservoir for carbon (C) in biosphere, containing globally twice as much C as the atmosphere and three times as much as vegetation. Soil CO2 efflux is highly sensitive to changes in surface temperature and relatively small changes in surface temperature may have a major influence on the magnitude of soil efflux. The potential increase in CO2 release from the soil caused by future elevated temperature may have a positive feedback effect on the atmospheric CO2 and global changes. For estimation o...