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By definition, stomatal conductance, usually measured in mmol m−2 s−1, conditions the net molar flux of carbon dioxide (CO2) entering or water vapor exiting through the stomata of a leaf, for a given concentration difference of CO2 or water vapor between the atmosphere and the sub-stomatal cavity. The so conditioned molar fluxes are for CO2 the net CO2 assimilation rate and for water vapour the transpiration rate.

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  • By definition, stomatal conductance, usually measured in mmol m−2 s−1, conditions the net molar flux of carbon dioxide (CO2) entering or water vapor exiting through the stomata of a leaf, for a given concentration difference of CO2 or water vapor between the atmosphere and the sub-stomatal cavity. The so conditioned molar fluxes are for CO2 the net CO2 assimilation rate and for water vapour the transpiration rate. The stomatal conductance, or its inverse, stomatal resistance, is under the direct biological control of the leaf through its guard cells, which surround the stomatal pore. The turgor pressure and osmotic potential of guard cells is directly related to the stomatal conductance. Stomatal conductance is a function of stomatal density, stomatal aperture, and stomatal size. Stomatal conductance is integral to leaf level calculations of transpiration (E). Multiple studies have shown a direct correlation between the use of herbicides and changes in physiological and biochemical growth processes in plants, particularly non-target plants, resulting in a reduction in stomatal conductance and turgor pressure in leaves. (en)
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  • By definition, stomatal conductance, usually measured in mmol m−2 s−1, conditions the net molar flux of carbon dioxide (CO2) entering or water vapor exiting through the stomata of a leaf, for a given concentration difference of CO2 or water vapor between the atmosphere and the sub-stomatal cavity. The so conditioned molar fluxes are for CO2 the net CO2 assimilation rate and for water vapour the transpiration rate. (en)
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  • Stomatal conductance (en)
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