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Distribution of leaf life span in the vertical profile. (A) Second-, (B) third- and (C) fourth-order axes during the active seasonal growth and (D) second- and (E) third-order axes during reduced seasonal growth. Leaf life span was expressed in GDD (°Cd per leaf) and four treatments were considered: e[CO2] with irrigation, e[CO2] under rainfed conditions, a[CO2] with irrigation and a[CO2] under rainfed conditions.
