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Differing Diffusive Resistance and Leaf Development May Cause Differing Transpiration Among Hardwoods in Spring

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Buds of several Betula and Prunus species and of Populus tremuloides broke before those of other species in spring, exposing green leaves having diffusive resistances as low as 5 s/cm. Leaves of Acer saccharum and Fagus grandifolia unfolded 10 days later and initially had resistances around 7 s/cm. Quercus rubra and Q. coccinea leaves developed still later, were initially chlorotic, and had resistances over 10 s/cm. This initially high resistance may help to reduce transpiration in these ring-porous species until the conducting system of the new annual ring is well developed. Resistance decreased during and after leaf expansion to final values of 3 to 5 s/cm in all species. Resistances of adaxial surfaces of all species were nearly always greater than 30 s/cm. Apparently in newly unfolded leaves, cuticular resistance is high, but in some species, stomata are open. Both leaf area and diffusive resistance can limit transpiration in spring. The product of diffusive conductance and leaf length squared indicated that transpiration begins several weeks earlier in Betula and P. tremuloides than in Quercus; Prunus, A. saccharum, and F. grandifolia are intermediate. Forest Sci. 22:359-364.

Keywords: Stomatal resistance; phenology

Document Type: Journal Article

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

Publication date: 1976-09-01

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 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
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