HR: 1400h
AN: H33B-13    [Abstracts]
TI: Storage and Hysteresis in the Soil Plant Atmosphere Continuum
AU: * Rigby, J R
EM: jrrigby@duke.edu
AF: Duke University, Department of Civil and Environmental Engineering, 127 Hudson Hall, Durham, NC 27708-0287, United States
AU: Porporato, A
EM: amilcare@duke.edu
AF: Duke University, Department of Civil and Environmental Engineering, 127 Hudson Hall, Durham, NC 27708-0287, United States
AB: We explore potential models of the effects of storage and hysteresis in plant tissues on transpiration and water stress. We extend the traditional circuit analogy for the soil-plant-atmosphere continuum to include the coupling of the plant with a stochastic soil moisture potential representing rainfall input. Analytic solutions for the soil- moisture dry-down coupled with the transpiration pathway and diurnal stomatal control are presented along with approximate solutions of the full stochastic problem. We also examine numerically the effect of introducing nonlinearities into the simple plant model (e.g., variable capacitance as a method of simulating xylem cavitation) and the potential for resulting hysteretic behavior in the transpiration stream.
DE: 1813 Eco-hydrology
DE: 1818 Evapotranspiration
DE: 1847 Modeling
DE: 1852 Plant uptake
SC: Hydrology [H]
MN: 2007 Joint Assembly