![]() ![]() Constant high relative humidity (RH) slightly stimulated CO 2 uptake while low nighttime RH reduced nocturnal CO 2 uptake. Constant chamber conditions also inhibited nocturnal CO 2 uptake. High rates of nocturnal CO 2 uptake were observed under day/night temperature regimes of 25/10, 25/15, 25/20, 30/20, and 35/20 C however, daytime temperatures of 40 C eliminated nighttime CO 2 uptake and a nighttime temperature of 5 C eliminated nocturnal CO 2 uptake, regardless of day temperature. No substantial seasonal effects on CO 2 exchange were observed. Plants were collected from a study site in North Carolina and placed in a gas exchange chamber for several days of continuous measurements. Patterns of CO 2 exchange in Spanish moss under various experimental conditions were measured using an infrared gas analysis system.
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