TARGAS-1 Operation Manual V. 1.02
77
Determine the rate of net photosynthesis (
) from the difference between CO
readings are corrected for water vapor, temperature, and atmospheric pressure. The
addition of transpirational water vapor dilutes the air leaving the cuvette (
assimilation we rearrange equation (
TARGAS-1 calculates and displays the CO
). As related to the calculated values in
concentration in the sub-stomatal cavity (
) using the equation derived by von
sub-stomatal CO2 concentration,
is the total conductance to CO
(1.585 is the diffusion ratio of CO
, and 1.37 is the diffusion ratio of CO
These calculations are based on the following assumptions:
the leaf is exposed on both upper and lower leaf surfaces
the upper and lower boundary layer resistances are similar
stomata are evenly distributed on both upper and lower leaf surfaces.