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Notes: Within-Crown Patterns of Transpiration, Water Stress, and Stomatal Activity in Abies amabilis

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Within-crown patterns of transpiration, water stress, and stomatal activity were investigated in Abies amabilis growing at 1300 m elevation in the Washington Cascades. Cuvettes were used to measure transpiration, stem moisture stress was estimated with a Scholander pressure bomb, and relative stomatal aperture was determined by pressure infiltration. Zones of stem moisture stress within the crowns of these open-grown trees were not always related to crown micro-environment. Frequently, stomatal resistance appeared to be the controlling factor. Redistribution of water from other parts of the crown appeared to determine some of the patterns observed. Forest Sci. 16:490-492.

Keywords: Sap velocity

Document Type: News

Affiliations: Ph.D. Candidate, College of Forest Resources, Univ. of Washington, Seattle

Publication date: December 1, 1970

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