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Modeled needle sugar (a) δ18O and (b) δ13C of Scots pine at 13:30 h with negligible sugar pool size and the observed sugar pool size. Panel (c) presents the formation period of the needle sugar pool isotopic signals and the weight of the current day assimilates in forming the isotopic signal of the needle sugar pool. The formation period and the current day weight were calculated assuming the sugar pool is well‐mixed and its size set equal to observed (see text).
