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Progression of stem water potential Ψstem and gas exchange between the two water status zones in 2017. (A) Ψstem, (B) stomatal conductance, gs, (C) net carbon assimilation, AN, (D) intrinsic water use efficiency, WUEi. Error bars represent standard error of the mean. Asterisks represents significant levels p: ∗∗∗p < 0.001, ∗∗p < 0.01, ∗p < 0.05.
