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Correlation coefficients between photosynthetic parameters of large old Z. serrata and climatic environmental factors during the entire growth season and May (spring).
PAR photosynthetically active radiation, Tair air temperature, Tleaf leaf temperature, VPD vapor pressure deficit, RH relative humidity, Ci intercellular CO2, CO2 ambient CO2 during the entire growth season (gray) and May (spring) (white).
*p < 0.05, **p < 0.01.
Significant values are in bold.
