2717774 FCO2 CO2 flux 16 2717775 FCO2 fractional CO2 6 2717781 FCO2 fluxes of CO2 2 2717783 FCO2 CO2 from L-(1-C)lysine oxidation 1 2717784 FCO2 CO2-fraction 1 2717780 FCO2 find that the CO2 flux density 1 2717778 FCO2 focused on identifying current knowledge about sea-air CO2 fluxes 1 2717782 FCO2 Forest soil CO2 efflux 1 2717779 FCO2 found that the mean CO2 efflux 1 2717785 FCO2 freeze-thaw cycles on the river CO2 flux 1