Tuesday, November 14, 2006

A Coupled Model in Studying the Paradigms for Stomatal Behavior of Corn.

Yang Yang1, Dennis Timlin2, David Fleisher3, Bruno Quebedeaux4, Soo-hyung Kim5, and V.R. Reddy3. (1) Univ of Maryland, Wye Research and Education Ctr., 10300 Baltimore Ave., Beltsville, MD 20705, (2) USDA-ARS-ACSL, Bldg. 001, Rm. 342, Beltsville, MD 20705-2350, (3) USDA-ARS, 10300 Baltimore Ave, Beltsville, MD 20705-2350, (4) Univ. of Maryland, Dept of Natural Resources Sciences and Landscape Architecture, 10300 Baltimore Ave, Beltsville, MD 20705, (5) ACSL, Bldg 001, Rm 342, Beltsville, MD 20705

The study presents a conceptual platform in the effort to study stomatal reaction of corn plants under different water status.  The model is developed by combining a two dimensional soil model (2DSOIL) and a corn model (Maizesim). Transport of water through the soil-plant-atmosphere continuum is simulated. Different mechanisms are implemented in the model to simulate the reaction of stomatal conductance to radiation level, temperature, vapor pressure deficit, soil moisture level, soil temperature etc. The applicability of different mechanisms is examined with data collected in the corn field and SPAR (soil-plant-atmosphere research) chambers.