Skip to main content

Simulation of Leaf Conductance and Transpiration in Juniperus occidentalis

Buy Article:

$29.50 plus tax (Refund Policy)


Western juniper (Juniperus occidentalis Hook.) is a conifer species well adapted to semiarid rangelands in portions of the western United States. Over a 2-yr period (1983-1984), water relations of mature western juniper trees were observed and soil temperature, soil water, air temperature, vapor density deficit (D a), and solar radiation were recorded. Data from 1983 were used to develop and calibrate a leaf conductance model for western juniper. The model was then tested against 1984 data. A daily soil water budget was maintained by coupling the conductance model with the hydrology component of the model SPUR (Simulation of Production and Utilization of Rangelands). Results indicate that the model successfully simulated seasonal conductance trends. Conductance was strongly affected by soil temperature and D a in spring, while soil water pressure and D a were important during summer. Simulated western juniper conductance rose to maximum in spring and was usually within one standard deviation of observed values. In the 1984 simulation, western juniper transpired 141 mm of water, 47% of the total evapo-transpiration for the site, and 44% of 1984 precipitation. Simulated western juniper conductance increased whenever environmental conditions moderated in late winter and spring. Juniper withdrew 37 mm of water between January and May 1984, suggesting it has potential to significantly alter watershed value and site productivity. For. Sci. 40(1):5-17.

Keywords: Computer model; SPUR; evapo-transpiration; transpiration; water balance

Document Type: Journal Article

Affiliations: Professor of Rangeland Resources, Eastern Oregon Agricultural Research Center, Oregon State University, Burns, OR 97720

Publication date: February 1, 1994

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.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
  • Submit a Paper
  • Membership Information
  • Author Guidelines
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more