Practical Considerations and Limitations of Using Leaf and Canopy Temperature Measurements as a Stomatal Conductance Proxy:Sensitivity across Environmental Conditions,Scale,and Sample Size

Stomatal conductance(gs)is a crucial component of plant physiology,as it links plant productivity and water loss through transpiration.Estimating gs indirectly through leaf temperature(Tl)measurement is common for reducing the high labor cost associated with direct gs measurement.However,the relationship between observed Tl and gs can be notably affected by local environmental conditions,canopy structure,measurement scale,sample size,and gs itself.