Leaf Resistance and Xylem Potential Differ Among Broadleaved Species
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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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
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