Abstract
To study the effect of global warming concomitant with rising CO2 on plant growth under field‐like conditions, a CO2–temperature gradient chamber (CTGC) was created from a standard temperature gradient chamber (TGC). Despite great daily and seasonal changes in ambient air temperature, the gradient of air temperatures was simulated by 5°C warmed conditions at the air outlet, rising at a rate of 1°C at 5 m intervals. Also, CO2 concentrations were linearly increased from the air inlet to the outlet; those at the air inlet and 25 m distance from the air inlet were 372 p.p.m and 756 p.p.m. (doubled), respectively. The CTGC proved successful in biological experiments conducted through a full growth season in 1998. This apparatus will be useful for understanding plant response to simultaneous changes in CO2 and temperature. Being a combination of a TGC and a CO2 gradient chamber, the improved CTGC allows parameters and validation data sets to both be obtained for models contributing to plant growth, species composition, and global carbon flux analysis.
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