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 Stomatal aperture is the dominant factor in the diffusion conductance of leaf surfaces, which controls both the water loss from
plant leaves and the uptake of CO2 for photosynthesis. Measurements of diffusion conductance are therefore important indicators
of plant water status and provide a valuable insight into plant growth and plant adaptation to environmental variables.
Quoted accuracy figures for other porometers and gas analysis systems are based on time-consuming laboratory set-up and calibrations which bear little comparison to field conditions. In contrast, the AP4 features simple direct calibration in the field against a tested physical standard. The AP4 measures diffusion conductance by comparing the precise rate of humidification within a small cuvette to readings obtained with a calibration plate. The plate has 6 diffusion conductance settings whose values have been accurately determined by finite element analysis.
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