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Transpiration Studies in Douglas-fir Using the Heat Pulse Technique

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Temporal and spatial variations in stem heat pulse velocities were investigated in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) of various sizes. Heat pulse velocity was compared with actual transpiration rate and highly significant correlations were obtained. Spatial variations were investigated with respect to radial distances past the cambium and at different locations about a stem. Maximum daytime average velocities were noted within a relatively narrow band in the sapwood, but the depth at which this band occurred varied during the study. Velocity measurements at various sectors around the stem of a codominant tree suggested differential rates of water loss from various parts of the crown. Temporal variations were examined for a codominant tree and were briefly compared with those observed in trees of other crown classes. In all cases heat pulse velocity was directly dependent upon evaporative demand, but with increasing soil moisture stress stomatal closure was noted and velocities no longer followed demand. Diurnal velocity patterns in all trees were generally similar, but variations attributed to differences in sapwood area, crown exposure, or both were noted. FOREST SCI. 23:377-390.
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Keywords: Pseudotsuga menziesii; sap flow; spatial variation; temporal variation

Document Type: Journal Article

Affiliations: Professor of Forest Meteorology, College of Forest Resources, University of Washington

Publication date: 1977-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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