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Leaf Conductance and Photosynthesis in Four Species of the Oak-Hickory Forest Type

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Forest grown saplings of sugar maple, northern red oak, white oak, and black oak were transplanted to a greenhouse. Measurements of leaf conductance, xylem pressure potential, osmotic potential, photosynthesis, leaf temperature, photosynthetically active radiation, vapor pressure gradient, and soil water potential were recorded on days which represented various stages in a dehydration-rehydration cycle. Under light sufficient conditions, leaf conductance in sugar maple, white oak, and northern red oak reacted to changes in turgor pressure while stomata in black oak responded only to changes in vapor pressure gradient. Photosynthesis was significantly related to leaf conductance in all species, and photosynthesis decreased with decreasing photosynthetically active radiation and/or decreasing soil water potential. After reaching a species specific optimum, photosynthesis decreased with increasing leaf temperature. Appreciable rates of photosynthesis (between 18 and 33 percent of maximum) were observed at leaf temperatures as high as 40°C. These physiological observations are discussed in terms of known ecological patterns of behavior for these species. Forest Sci. 24:73-84.

Keywords: Acer saccharum; Quercus alba; Quercus rubra; Quercus velutina; Water relations

Document Type: Journal Article

Affiliations: Research Analyst, School of Forestry, Fisheries and Wildlife

Publication date: March 1, 1978

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

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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