CO2 source-sink in karst processes in karst areas of China

The CO2 source-sink of atmospheric greenhouse has a close relationship with karst processes. The corrosion of carbonate rocks lends to the sink of atm ospheric CO2, whereas the deposition of carbonate rocks gives off CO2 into atmosphere, which is one of the sources of atmospheric CO2. According to th e exposed areas of carbonate rocks in China, the flux of atmospheric CO2 co nsumed in karst processes is estimated at about 1.77 x 10(13) g CO2/a, Cons idering the global karst area the flux Of atmospheric CO2 consumed in corro sion may be an important parr of the missing sink. And the sink has a tende ncy of continuous increase. The release of CO2 from karst water is usually less than the sink of atmospheric CO2 consumed in karst processes. But in a ctive tectonic zone the release of high CO2 concentration of mantle source in the geothermal karst water should not be neglected.