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Spatial and Temporal Aspects of Water Relations of Three Tree Species with Different Vascular Anatomy

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White oak, eastern redcedar, and black walnut trees exhibited distinct patterns of water relations in response to seasonal variations in soil moisture and evaporative demand. While in all three species drought periods were associated with declining leaf water potential and leaf conductance, black walnut maintained higher predawn and solar noon leaf water potential and leaf conductance (particularly late in the growing season) than did white oak or redcedar. These differences may have been related to deeper rooting and early leaf abscission in black walnut as compared to white oak and redcedar, a situation which would likely result in water conservation and greater water supply to individual leaves. Flow resistance between soil and leaves and water potential gradients between root and crown were greater in eastern redcedar than in either angiosperm species, a result largely attributable to high resistance presented by xylem tissue in which only tracheids participated in axial waterflow. Forest Sci. 29:317-329.
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Keywords: Juglans nigra; Juniperus virginiana; Quercus alba; flow resistance; water potential gradients

Document Type: Journal Article

Affiliations: Assistant Professor, School of Forestry, Fisheries and Wildlife, University of Missouri, Columbia, MO 65211

Publication date: 1983-06-01

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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