Fig. 1.

Relationship between the short-term response of g _s to elevated [CO₂] [measured during short (hours) interruptions in CO₂ enrichment] and the long-term effect of growth under elevated [CO₂] on g _s in temperate forest free-air CO₂ enrichment (FACE) experiments. Regression statistics are shown in the figure. Based on data from Cech et al. (2003), Keel et al. (2007), Maier et al. (2008), Domec et al. (2009), Onandia et al. (2011) and Tor-ngern et al. (2015)