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Leaf Resistance and Xylem Potential Differ Among Broadleaved Species

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Mean leaf diffusive resistance in unstressed trees and shrubs of 27 species in New Hampshire and southern Maine ranged only from 2.5 to 4.5 s/cm after normalizing to 15 mbar vapor pressure deficit. One species, Spiraea latifolia, had a higher resistance, 5.8 s/cm. During water stress, stomata partially closed at xylem pressure potentials that differed among genera, averaging -15 bar for Betula, -17 for Populus, -21 for Quercus, and -23 for Prunus. The potentials did not decrease further as resistances increased. Stressed Quercus and Prunus seedlings had lower potentials than did larger trees. FOREST SCI. 23: 411-419.
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Keywords: Diffusive resistance; drought; plant water potential; water stress

Document Type: Journal Article

Affiliations: Principal Meteorologist, Northeastern Forest Experiment Station, Forestry Sciences Laboratory, USDA Forest Service, Durham, N. H. 03824

Publication date: 1977-12-01

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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