Canopy conductance

Canopy conductance, commonly denoted ${\displaystyle g_{c}}$ , is a dimensionless quantity characterizing radiation distribution in tree canopy. By definition, it is calculated as a ratio of daily water use to daily mean vapor pressure deficit (VPD).^[1] Canopy conductance can be also experimentally obtained by measuring sap flow and environmental variables.^[2] Stomatal conductance may be used as a reference value to validate the data, by summing the total stomatal conductance ${\displaystyle g_{s}}$ of all leaf classes within the canopy.^[3]

${\displaystyle g_{c}=\sum _{layer_{1}}^{layer_{N}}(g_{s,sun}^{i}\cdot l_{sun}^{i})+(g_{s,shade}\cdot l_{shade})}$

See also

• Ecohydrology
• Stomatal conductance
• Transpiration

References

1. Callander, B.A.; Woodhead, T. "Canopy conductance of estate tea in Kenya". Elsevier. Archived from the original on 2014-01-15. Retrieved 2014-01-15.
2. Morris, Jim; Mann, Louise; Collopy, John (1998). "Transpiration and canopy conductance in a eucalypt plantation using shallow saline groundwater". Tree Physiology. 18 (8–9): 547–555. doi:10.1093/treephys/18.8-9.547. PMID 12651341.
3. WIMOVAC (1998). "WIMOVAC Canopy Processes Module". University of Illinois.