Analyses of assumptions and errors in the calculation of stomatal conductance from sap flux measurements.

  title={Analyses of assumptions and errors in the calculation of stomatal conductance from sap flux measurements.},
  author={Brent E Ewers and Ram Oren},
  journal={Tree physiology},
  volume={20 9},
We analyzed assumptions and measurement errors in estimating canopy transpiration (E(L)) from sap flux (J(S)) measured with Granier-type sensors, and in calculating canopy stomatal conductance (G(S)) from E(L) and vapor pressure deficit (D). The study was performed in 12-year-old Pinus taeda L. stands with a wide range in leaf area index (L) and growth rate. No systematic differences in J(S) were found between the north and south sides of trees. However, J(S) in xylem between 20 and 40 mm from… CONTINUE READING
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