【摘要】 对闽江下游夏季表层水体的二氧化碳分压（简记为p）进行测定,探讨河流表层水体中p及水-气界面CO₂通量在感潮段的时间变化特征及其影响因素.结果表明,闽江下游夏季p介于217～2 539 Pa之间,均值为（1 011.06±654.13） Pa;河流CO₂通量变化范围为-1.15～13.10 mmol·m^-2·d^-1,平均值为（4.48±5.13） mmol·m^-2·d^-1,总体表现为大气CO₂的弱源;p与电导率、营养盐组成呈现显著正相关关系（p<0.05）,与DO呈现极显著负相关关系（p<0.01）.更多还原

【Abstract】 The carbon dioxide partial pressure（p） in the surface water of the lower reaches of Minjiang River was measured in summer.The characteristics about the temporal changes of p and CO₂ flux of surface water from a tidal reach and their influencing factor were discussed combined with the hydrological conditions.The results showed that p during summer in the lower reaches of Minjiang River was between 217～2 539 Pa,the mean value was（1 011.06±654.13） Pa. The CO₂ fluxs from the river ranged from-1.15 to 13.10 mmol·m^-2·d^-1 and the mean value was（4.48±5.13） mmol·m^-2·d^-1,and acted as a weak source of atmospheric CO₂. p and conductivity and nutrient were positively correlated（P< 0.05）,there was a very significant negative correlation with DO（P<0.01）.更多还原