HR: 09:45h
AN: H41B-05    [Abstracts]
TI: Parameterizing Root Water Uptake as a Function of Water and Salinity Stress
AU: * van Genuchten, M T
EM: rvang@ussl.ars.usda.gov
AF: George E. Brown, Jr. Salinity Laboratory, USDA-ARS, 450 W. Big Springs R.d, Riverside, CA 92507 United States
AU: Skaggs, T H
EM: tskaggs@ussl.ars.usda.gov
AF: George E. Brown, Jr. Salinity Laboratory, USDA-ARS, 450 W. Big Springs R.d, Riverside, CA 92507 United States
AB: The extraction of water from soil by plant roots is a critical component of water and energy balances at the land surface. Root water uptake is affected by a number of hydropedologic variables, including soil salinity and/or drought. We review various approaches that may be used to model root water uptake as a function of water and salinity stress, emphasizing particularly the different forms of the sink term that may be incorporated into the Richards equation for local scale modeling, as well as the challenges posed by the need to model water uptake at local, field, and regional scales. Modeling approaches are illustrated using numerical simulations and experimental data collected on forage crops grown under combinations of water and salinity stress.
DE: 1812 Drought
DE: 1818 Evapotranspiration
DE: 1851 Plant ecology
DE: 1866 Soil moisture
DE: 1875 Unsaturated zone
SC: Hydrology [H]
MN: 2005 Joint Assembly