Evaluation of Non-steady State Water Uptake by Plant Roots.
(S01-zhuang114818-poster)
Authors:
J. Zhuang* - Texas Tech Univ.
G.R. Yu - Chinese Academy of Sciences K. Nakayama - Chiba University, Japan
Abstract:
Understanding of water uptake by plant roots is vital for management of crop production. In this study, based on the field experiments on sap flow of maize plants, relationships between water uptake rate, water potential difference, and resistance were examined. The steady-state model of van den Honert was compared with the non-steady state model. Futhermore, the steady state model was extended into instantaneous non-steady state model by introducing ‘coil-effect’ concept to consider the instantaneous nature of water uptake by roots. The simulation of water flow in soil-maize plant system indicates that inclusion of capacitance of plant and ‘coil-effect’ of water uptake significantly improved prediction of root water uptake.
Speaker Information: Jie Zhuang, Texas Tech Univ., Department of GeoSceinces MS 41053 Texas Tech Un, Lubbock, TX 79409-1053; Phone: 806-742-1603; E-mail: [email protected]
Session Information: Tuesday, November 4, 2003, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 1110) Keywords: Root water uptake; Non-steady sate; Maize; Sap flow
