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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.

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: December 1, 1977

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