The formation of carbonate rocks has had a dramatic sink effect on atmospheric CO 2 throughout geological time. The wide global distribution of carbonate rocks and their strong sensitivity to climate change mean that carbonate rock corrosion consuming air/soil CO 2 can play an important role in the global carbon cycle. The carbon sink accounts for 12.00%–35.29% of the “missing carbon” in the global carbon cycle. Using the Pearl River Basin as a case study, we analyzed comprehensively the factors impacting karstification and the carbon sink, collected existing monitoring data, and established a regression equation incorporating corrosion rate, annual precipitation, soil respiration rate and net primary productivity from typical observation sites. We used Arcview 3.3 software to estimate spatially the atmospheric CO 2 sink flux in the Basin’s karst region by combining the distribution of carbonate rock categories. We determined annual CO 2 consumption due to carbonate rock corrosion to be 1.54×10 7 t CaCO 3 a −1 , equal to 1.85×10 6 t C a −1 .
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Cao et al. (2011) studied this question.
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