The impact of water quality changes of the Changjiang River on dissolved CO2 and silicate concentration and seasonal flux in the water column for the past decades were evaluated, based on monitoring data from hydrographic gauge. It was found that dissolve The impact of water quality changes of the Changjiang River on dissolved CO2 and silicate concentration and seasonal flux in the water column for the past decades were evaluated, based on monitoring data from hydrographic gauge. It was found that dissolve