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Diurnal Dimensional Fluctuations in a Douglas-fir Stem in Response to Tree Water Status

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Diurnal changes in stem circumference at the 1954 and 1963 internodes of a 22-year-old Douglas-fir were monitored with automated band dendrometers. Determinations of internal tree water potential and estimates of transpiration were used to characterize the water status of the tree. Environmental monitoring encompassed air temperature along the tree stem and solar radiation above the forest canopy. The 1963 internode, within the live crown, was relatively more sensitive to the factors affecting stem dehydration and shrinkage than the 1954 internode below the live crown. The diurnal patterns of stem shrinkage seemed to be determined by the lag between water absorption and transpirational loss, which was in turn dependent upon soil water supply and atmospheric moisture demand. In addition, transpirational demand appeared to be partially fulfilled by water temporarily stored in stem tissue. Forest Sci. 19:251-255.
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Keywords: Transpiration; evaporative demand; water potential

Document Type: Journal Article

Affiliations: Research Assistant, College of Forest Resources, University of Washington, Seattle

Publication date: 1973-12-01

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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