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Water Relations and Leaf Morphology of Juniperus occidentalis in the Northern Great Basin

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Relationships between seasonal and diurnal leaf conductance, xylem sap potential, transpiration rates, osmotic potential, vapor pressure deficit, soil and air temperatures, soil water potential, and photosynthetic active radiation are quantified for Juniperus occidentalis Hook. Additionally, xeromorphic aspects of leaf morphology were examined with electron microscopy. Xylem sap potentials and leaf conductance ranged from -0.5 to -2.7 MPa and 0.02 to 0.13 cm s-1, respectively, during the two-year study. Leaf conductance is not clearly related to any single environmental variable, but is primarily influenced by vapor pressure deficit, photosynthetically active radiation, and factors such as soil and air temperatures, and soil water, which influence the resistance of water flow through the plant. Stomates usually closed when xylem sap potentials reached - 2.0 MPa. Stomates on mature leaves are distributed unequally on adaxial and abaxial surfaces, with none occurring on exposed surfaces. Drought avoidance mechanisms displayed by the plant were leaf morphological characteristics, low maximum leaf conductance, and reduced maximum leaf conductance under high evaporative conditions. Cold soil temperatures increased resistance of water flow through the soil-plant-atmosphere continuum. Xeromorphic leaf structure as well as seasonal osmotic adjustment provide primary mechanisms in the tolerance of Juniperus occidentalis to drought stress. For. Sci. 33(3):690-706.

Keywords: Leaf conductance; stomata; transpiration; western juniper; xylem sap potential

Document Type: Journal Article

Affiliations: Assistant Professor, Department of Biology, Utah State University, Logan, UT 84322

Publication date: September 1, 1987

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  • 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
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