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Canopy conductance, commonly denoted g_c, is a
dimensionless quantity Dimensionless quantities, or quantities of dimension one, are quantities implicitly defined in a manner that prevents their aggregation into unit of measurement, units of measurement. ISBN 978-92-822-2272-0. Typically expressed as ratios that a ...
characterizing radiation distribution in tree
canopy Canopy may refer to: Plants * Canopy (biology), aboveground portion of plant community or crop (including forests) * Canopy (grape), aboveground portion of grapes Religion and ceremonies * Baldachin or canopy of state, typically placed over an a ...
. By definition, it is calculated as a ratio of daily water use to daily mean vapor pressure deficit (VPD). Canopy conductance can be also experimentally obtained by measuring sap flow and environmental variables.
Stomatal conductance Stomatal conductance, usually measured in mmol m−2 s−1 by a porometer, estimates the rate of gas exchange (i.e., carbon dioxide uptake) and transpiration (i.e., water loss as water vapor) through the leaf stomata as determined by the degree of ...
may be used as a reference value to validate the data, by summing the total stomatal conductance g_s of all leaf classes within the canopy. g_c = \sum_^ (g^i_ \cdot l_^i) + (g_ \cdot l_)


See also

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Ecohydrology Ecohydrology (from Ancient Greek, Greek , ''oikos'', "house(hold)"; , ''hydōr'', "water"; and , ''-logy, -logia'') is an interdisciplinary scientific field studying the interactions between water and ecological systems. It is considered a sub disc ...
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Stomatal conductance Stomatal conductance, usually measured in mmol m−2 s−1 by a porometer, estimates the rate of gas exchange (i.e., carbon dioxide uptake) and transpiration (i.e., water loss as water vapor) through the leaf stomata as determined by the degree of ...
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Transpiration Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. It is a passive process that requires no energy expense by the plant. Transpiration also cools plants, c ...


References

Plant physiology {{plant-physiology-stub