Abstract
AbstractCO2 and H2O vapor exchange were measured by enclosing citrus (Citrus sinensis cv. Sour Orange) leaves in a temperature controlled transparent leaf chamber. Introduction of dry air into the closed circuit gas flow caused cyclic oscillation in CO2 and H2O vapor exchange. It is suggested that oscillation in the CO2 exchange at the CO2 compensation concentration is due to oscillation in non‐stomatal resistance to CO2. Three types of oscillation were observed: 3–6 min (peak to peak) in young leaves, 30 min in mature leaves, and 160 min in old leaves.
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