Image Instrumentation of Plants Exposed to Air Pollutants

Quantification of Physiological Information Included in Thermal Infrared Images

Abstract

Heat and mass transfer on a leaf were examined from the standpoint of evaluating distributional patterns of physiological informations such as transpiration rate, stomatal resistance and air pollutant sorptions from leaf temperature distribution measured by an instrumentation system of thermal infrared images, and models for the evaluating were derived. Furthermore, parameters of the models, accuracies of environmental controls and measurements on the leaf and so on were examined by experiments. As a result, transpiration rate and stomatal resistance to water vapor diffusion on the leaf were evaluated within accuracies of 0.02×10^-5g·cm^-2·s^-1 and 0.3s·cm^-1, respectively. Accuracies of sorption rates of air pollutants such as SO₂, NO₂, O₃ and PAN will be applied corespondingly to that of transpiration rate from an analogy between the models for the evaluating transpiration rate and sorption rates of these air pollutants. Finally, changes in distributions of physiological informations mentioned above were evaluated from the changes in distribution of leaf temperature during SO₂ exposure.