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To analyze the daytime and phenological variations of canopy O3 and CO2 uptake of winter wheat, the canopy fluxes of wheat plants were measured using a chamber system with four different O3 levels (0, 40, 80, and 120 nmol mol−1) being applied. During the daytime (7:30–18:00 hours), canopy fluxes usually peaked around noon in early growing stages, while a generally decreasing trend from morning to...
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