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Standardized sensitivity of GPP to air temperature (Ta), vapour pressure deficit (VPD), soil water content (SWC) and photosynthetic photon flux density (PPFD) during the summers of 2018 and 2016 under different SWC changes. Error bars represent ±1 standard error. Insert numbers are mean surface conductance (Gs, ± standard error) in the summer of 2018 (orange) and 2016 (blue). (Online version in colour.)
