摘要
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 1.54×107 t CaCO3 a-1,equal to 1.85×106 t C a-1.
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 1.54×107 t CaCO3 a-1,equal to 1.85×106 t C a-1.
基金
supported by the National Natural Science Foundation of China (40872213)
the Project of the China Geological Survey (1212010911062)
the Project of the China Geological Survey(S-2010- KP03-07-02)
