Abstract
This paper explores the possibility to use a model for assimilation rate, A n, to calculate stomatal conductance, g s. The relation between stomatal conductance, g s, and net photosynthetic rate, A n, is studied for grapevine ( Vitis Vinifera L. cv Airen). Data were collected in a dry Mediterranean vineyard in Central Spain, under a wide range of temperature and humidity conditions, but with sufficient water supply. The data confirm the existence of a strong correlation between A n and g s. However, the relation is strongly influenced by leaf-to-air specific humidity deficit, D s. This influence can be expressed by means of a linear relation between D s and the ratio f, which is the ratio of internal to external CO 2 concentration, C i C s , corrected for CO 2 concentration. The data were used to tune a coupled A n− g s model using as much standard coefficients as possible. Using the linear relation between D s and f the model also takes stomatal humidity responses into account. A model test reveals that the current approach is able to simulate the photosynthetic rate and stomatal conductance of grapevines reasonably well.
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