Fig. 3.

Venn diagrams showing the contributions of different factors and their interactions to the increase in GPP under elevated CO₂ conditions as compared to that under ambient CO₂ conditions for the whole growing season (A), dissected contributions on a sunny day during the early developmental stage (195 DOY) (B), dissected contributions on a cloudy day during the later developental stage (231 DOY) (C), and dissected contributions on a sunny day during the later developmental stage (234 DOY) (D).