Abstract
Sixteen sour orange tree (Citrus aurantium L.) seedlings were grown out-of-doors at Phoenix, Arizona, in eight clear-plastic-wall open-top enclosures maintained at four different atmospheric CO2 concentrations for a period of 2 years. Over the last year of this period, the trees were coppiced five times. The amount of dry matter harvested at each of these cuttings was a linear function of the atmospheric CO2 concentration to which the trees were exposed. For a 75% increase in atmospheric CO, from 400 to 700 microliter per liter (μL liter 1), total aboveground biomass rose, in the mean, by a factor of 3.19; while for a 400 to 800 μL liter 1 doubling of the air's CO2 content, it rose by a factor of 3.92. The relative summer (mean air temperature of 32.8 C) response to CO2 was about 20% greater than the relative winter (mean air temperature of 16.4 C) response.
Published Version
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