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中文摘要：
分别于2008和2009年夏季对南海南沙群岛永暑礁（环礁）、西沙群岛永兴岛（岛礁）和海南三亚鹿回头岸礁进行了海-气CO2交换的连续观测.结果表明：（1）南海珊瑚礁区表层海水和大气pCO2存在明显的日周期变化,白天下降,晚上上升;（2）不同礁区大气pCO2日变幅小,而表层海水pCO2日变幅较大,永暑礁潟湖为～70μmol mol^-1,鹿回头及永兴岛礁坪分别为264～579μmol mol^-1和420～619μmol mol^-1,鹿回头礁外为324～492μmol mol^-1;（3）不同礁区海-气CO2交换通量也有较大差异,永暑礁潟湖为0.4mmol CO2m^-2d^-1,永兴岛礁坪为4.7mmol CO2m^-2d^-1,鹿回头湾为9.8mmol CO2m^-2d^-1,表明南海珊瑚礁在夏季是大气CO2的源.在水深较浅的礁坪,生物代谢是海水pCO2变化的主要驱动因素,而较深的潟湖或礁外,水动力条件和生物代谢共同作用影响海水pCO2的变化.相对于大洋区,无机碳代谢对珊瑚礁区海水pCO2的变化有更显著的影响.
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