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Photosynthesis, Water Relations, and Drought Adaptation in Six Woody Species of Oak-Hickory Forests in Central Missouri

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Responses of photosynthesis, leaf conductance, water potential, and tissue water relations to drought were compared during two growing seasons for saplings of six woody species that occupy natural habitats of varying soil moisture regime. Drought substantially restricted leaf conductance in all angiosperm species (Quercus velutina, Q. alba, Q. rubra, Cornus florida, and Acer saccharum), but only slightly reduced conductance of Juniperus virginiana. Cornus florida exhibited the most accentuated response to drought because of its inability to avoid low water potential, a situation attributable to the known shallow rooting habit of this species. Differences in drought adaptation among angiosperms were apparent, with Quercus species exhibiting generally lower osmotic potentials at full turgor and turgor loss point, higher moduli of leaf tissue elasticity, and higher rates of photosynthesis under drought compared with A. saccharum and C. florida. These characteristics would confer a competitive growth advantage to the oaks on dry sites. Juniperus virginiana, a species usually found on very xeric sites, exhibited a very different, but no less effective, pattern of drought adaptation. An inherently low capacity for water loss and the ability to sustain stomatal opening at low water potentials appear to promote the success of this species in dry environments. Forest Sci. 31:557-569.

Keywords: Drought tolerance; water relations

Document Type: Journal Article

Affiliations: Research Specialist, School of Forestry, Fisheries and Wildlife, University of Missouri, Columbia, MO 65211

Publication date: 1985-09-01

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
    Other SAF Publications
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