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本文通过对中国南方岩溶区近２０００个水化学分析资料的统计分析，研究了云南、贵州、四川、广西、湖南、湖北六省（区）岩溶水ＣＯ２含量，ＣＯ２吸收模数，计算了南方碳酸盐岩出露区和分布区岩溶系统吸收ＣＯ２的数量，对全国碳酸盐岩出露区吸收的ＣＯ２作了估算，９０．７万ｋｍ２的碳酸盐岩出露面积所吸收的ＣＯ２为１４．０３×１０９ｋｇ／ａ，在碳循环平衡计算中，除了海洋吸收，大气增量以外，还有１２％被“遗漏的汇”吸收，岩溶系统吸收的ＣＯ２在这１２％中占１５％，它是全球碳循环的一个重要组成部分，是一个被“遗漏的汇”，它对大气ＣＯ２具有不可忽视的调节功能。
In this paper, the karst water CO2 content and CO2 absorption modulus of Yunnan, Guizhou, Sichuan, Guangxi, Hunan and Hubei provinces (districts) were studied through statistical analysis of nearly 2000 water chemistry analysis data in south karst area of China. The amount of CO2 absorbed by karst outcropping and distribution areas of the acid rock and the CO2 absorption of the carbonate outcropping area of the country are estimated. The CO2 absorption area of 907,000 km2 of carbonate rock is 14.03 × 109kg / a. In the calculation of carbon cycle balance, in addition to the ocean absorption and atmospheric increment, 12% is absorbed by “missed sinks”, and the CO2 absorbed by the karst system accounts for 15% of the 12% An important part of the carbon cycle is a “missing sink” that has a non-negligible regulatory function on atmospheric CO2.