Water Use by Tree and Shrub Forms of Dryland Oaks
Investigators (most current known information)
Water use by mature and sprout (coppice) forms of Emory oak (Quercus emoryi) was estimated by the sap-flow method. Five standards and five coppice trees were sampled in an area that had been harvested for fuelwood and five mature trees were sampled in an uncut area. Differences were recognized between coppice and standards in the cut area and between coppice trees and mature trees from the uncut area. Regression equations were derived relating estimated annual water use to tree diameter, height, and crown measurements for both cut- and uncut-area trees. Seasonal water use by each tree form showed relationship to precipitation, but little relationship to temperature and relative humidity. Woodland density and tree size measurements facilitate extrapolation of water use from the 15 sampled trees to a per area basis. Water use was approximately 1,900 cubic meters per hectare per year, based upon drc measurements, for the uncut area and 3168 cubic meters for the cut area. Estimated water use on a per unit area was approximately 1.67 times greater for the cut area than the uncut area.
Articles in Journals
Schiller, G., S. Cohen, E.D. Ungar, Y. Moshe, and Nir Herr. 2007. "Estimating water use of sclerophyllous species under East-Mediterranean climate. III. Tabor oak forest sap flow distribution and transpiration." Forest Ecology and Management . 238(1-3):147-155.
Ffolliott, P. F., G.J. Gottfried, Y. Cohen and G. Schiller. 2003. "Transpiration by dryland oaks: Studies in the southwestern United States and northern Israel." Journal of Arid Environments 55:595-605.
Ffolliott, P. F. 2000. "An annual water budget for Emory oak woodlands: An initial approximation." Hydrology and Water Resources in Arizona and the Southwest 30:37-41.
Ffolliott, P.F. and G.J. Gottfried. 1999. "Water use by Emory oak in southeastern Arizona." Hydrology and Water Resources in Arizona and the Southwest 29:43-48.
Ffolliott, P. F. and G.J. Gottfried. 2000. "Changes in transpiration by Emory oak following tree harvesting." In Watershed 2000:Science and engineering technology for the new millennium. eds. Flug, M. and D. Frevert, Environment & Water Resources Institute, CD-ROM. American Society of Civil Engineers, Reston VA.
Gottfried, G.J., P. F. Ffolliott, G. Schiller and Y. Cohen. 1999. "Water use by dryland oaks." In IALC land management workshop: A tenth anniversary celebration of USFS, CSREES, Israeli and IALC partnerships," 3-4. International Arid Lands Consortium. Tucson AZ.
Folkerts, Shuan H. 1999. Water use by Emory oak in southeastern Arizona: Estimation by sap-flow measurements. M.S. Thesis. University of Arizona, Tucson AZ.