An attempt to establish a synthetic model of photosynthesis-transpiration based on stomatal behavior for maize and soybean plants grown in field

• Published in: Journal of plant physiology Vol. 158; no. 7; pp. 861 - 874
• Main Authors: Yu, Gui-Rui, Zhuang, J.i.e., Yu, Zhen-Liang
• Format: Journal Article
• Language: English
• Published: Jena Elsevier GmbH 2001; Elsevier
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Economic plant physiology; Fundamental and applied biological sciences. Psychology; Metabolism; Net assimilation, photosynthesis, carbon metabolism. Photorespiration, respiration, fermentation (anoxia, hypoxia); Nutrition. Photosynthesis. Respiration. Metabolism; photosynthesis; Photosynthesis, respiration. Anabolism, catabolism; Plant physiology and development; stomatal conductance; synthetic model; transpiration; Water and solutes. Absorption, translocation and permeability; Water relations, transpiration, stomata; water use efficiency; water use efficiency; stomatal conductance; transpiration; photosynthesis; synthetic model; Water; Monocotyledones; Zea mays; Interspecific comparison; Carbon dioxide; Stomatal conductance; Stomata; Water use efficiency; Glycine max; Modeling; Cereal crop; Field experiment; Grain legume; Leguminosae; Gramineae; Net assimilation rate; Water regime; Dicotyledones; Angiospermae; Evapotranspiration; Spermatophyta; Gas exchange; Diffusion coefficient; Photosynthesis
• ISSN: 0176-1617; 1618-1328
• DOI: 10.1078/0176-1617-00177

A synthetic model of photosynthesis-transpiration was established based on a comprehensive consideration of models of CO 2 and H 2O fluxes controlled by stomata of plant leaves.The synthetic model was developed by introducing the internal conductance to CO 2 assimilation, g ic, and the general equation of stomatal conductance model to H 2O diffusion, g sw = g 0+a 1 A m f( D s)/( C s-Γ), into models of CO 2 and H 2O diffusion through the plant leaves stomata. In the above expression, g 0 and a 1 are coefficients, C s ambient CO 2 concentration at leaf surface, Γ CO 2 compensation point, and f( D s) the general function describing the response of stomatal conductance to humidity. Using the data observed in maize ( Zea mays L.) and soybean ( Glycine max Merr.) plants grown in the field, the parameters in the model were identified, and the applicability of the model was examined. The verification indicated that the developed model could be used to estimate net assimilation rate, transpiration rate, and water use efficiency with a high enough level of precision. The examination also showed that when f( D s) = h s or f( D s) = (1+ D s/ D 0) −1 was employed, the estimation precision of the synthetic model was highest. In the study, the parameter g ic was estimated by means of a linear function of Q P because it was shown to be mostly correlated with photosynthetic photon flux, Q P, among various environmental factors.