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In preparation for an investigation of the effects of elevated carbon dioxide (CO2) concentration on the two tree species Pinus radiata D. Don and Nothofagus fusca (Hook. f.) Oerst, the environmental conditions inside sixteen open-top chambers, of the design described by Heagle et al. (1989), were measured and compared with those outside. During a period in late summer, both air temperature and air saturation deficit were greater inside the chambers, with mean increases of 0.3?C and 0.1 kPa, respectively. The increases were closely related to solar irradiance, reaching maximum differences for temperature and air saturation deficit of 4.3?C and 0.8 kPa, respectively, when solar irradiance was greater than 1600
Whitehead et al. (Wed,) studied this question.