Leaf Temperature Effects on Measurements of Diffusive Resistance to Water Vapor Transfer

Abstract
Substantial errors can be introduced to estimates of leaf resistance (rl) obtained from diffusion porometers unless precautions are taken to reduce the leaf-cup temperature difference (Tleaf — Tcup) to acceptable levels prior to measurement. When Tleaf > Tcup, underestimation of leaf resistance occurs; the reverse applies when Tleaf < Tcup.