Evaluation of the Tritiated Water Method for Measurement of Transpiration in Young Pinus taeda L.

• DOI: 10.1093/forestscience/28.1.5
• Publication Date: 1982-03-01
• Authors: Jeffrey C. Luvall; Charles E. Murphy
• Keywords: Tritiated water

The tritiated water (HTO) technique was evaluated as a method for measurement of transpiration young loblolly pine. Twenty-one millicuries tritium in 3 ml were injected into holes drilled at the base trees. rate estimated to average 8.3 liters/day per tree three trees February and 40.4 single July. Several methods collecting from analysis evaluated. collection by condensation clear plastic bags sealed around branch tips proved be simple, reliable water. Difference integral activity with distance injection site found. Serious errors estimation are possible if difference canopy not taken account. measured collected nearest point provided good when compared evaporation determined soil balance or Penman-Monteith formula.