Water use along a semi-arid riparian continuum
Description:
    This project examines intra- and interspecific patterns of water use by desert riparian tree species. We are testing predictions from a root optimal allocation model that incorporates cost and income estimates of root function. The model is intended to explain ground water and precipitation use patterns by woody species growing at perennial, intermittent, and ephemeral stream channels in southeastern Arizona. Specific tasks include: 1) field estimates of tree water sources 2) transpiration measurements estimated from sap flux, and 3) measurements of root respiration and construction costs.
College/School:
    College of Agriculture; Renewable Natural Resources, School of		Department/Unit/Center:
    School of Renewable Natural Resources
Investigator(s):
    David Williams (dgw@ag.arizona.edu)
Start date:
     1996		Duration:
    Two to five years		Total funding:
    $98000		Project status:
    ongoing
Funding source:
    USDA-NRI
Research areas:
    biology; botany; ecology; forests; groundwater; hydrology; riparian; surface; supply
Additional information:
    Schaeffer, S., and D.G. Williams (1998) Transpiration of desert riparian forest canopies estimated from sap flux. Pages 180-184, In Wood, E.F., A.G. Chebouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the Special Symposium on Hydrology. American Meteorological Society, Boston, Massachusetts.

Snyder, K.A., D.G. Williams, and V.L. Gempko (1998) Water source determination for cottonwood, willow and mesquite in riparian forest stands. Pages 185-188, In Wood, E.F., A.G. Chebouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the Special Symposium on Hydrology. American Meteorological Society, Boston, Massachusetts.

Williams, D.G., J.-P. Brunel, S.M. Schaeffer, and K.A. Snyder (1998) Biotic controls over the functioning of desert riparian ecosystems. Pages 43-48, In Wood, E.F., A.G. Chebouni, D.C. Goodrich, D.J. Seo, and J.R. Zimmerman, technical coordinators. Proceedings from the Special Symposium on Hydrology. American Meteorological Society, Boston, Massachusetts.


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