Diurnal Measurements

Diurnal measurements are a series of discrete measurements taken throughout the day. This measurement tracks plant responses to changing temporal and environmental conditions.

diurnal graph

Photosynthetic assimilation rate of Glycine max (soybean) measured over a day. Soybeans were treated either with ambient air (control, blue), elevated CO2 (550ppm) in ambient air (black), or elevated O3 (1.25x ambient) in ambient air (orange) in a free-air gas concentration enrichment (FACE) system. Errors bars are the standard error of the means (n=4).

Bernacchi et al., 2006, Plant, Cell and Environment 29(11): 2077-2090.


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