Extended Data Fig. 4: Analyses of the partial correlation coefficients between Amax,2000 and \(\overline{{T}_{\boldsymbol{air}}}\) derived from long-term flux sites and their relationships with the site-level average \({T}_{\boldsymbol{air}}\) and variability of \({T}_{\boldsymbol{air}}\).
From: Evidence for widespread thermal acclimation of canopy photosynthesis
a, Geographic distribution of partial correlation coefficients between Amax,2000 and \(\overline{{T}_{{air}}}\) controlling for \(\overline{{PPFD}}\), fAPAR and Tair across sites with observations spanning over five years. b, Relationship between partial correlation coefficients and the site-level averages of \(\overline{{T}_{{air}}}\). c, Relationship between partial correlation coefficients and the site-level standard deviation of \(\overline{{T}_{{air}}}\). The black lines in b and c represent the predicted mean values from linear regression models, and the grey shaded areas indicate their 95% confidence intervals. P-values are determined through two-sided Pearson’s correlation significance tests. The “Forest” biome category includes evergreen needle-leaf forests, deciduous broadleaf forests, and mixed forests. Other PFTs are croplands (CRO), evergreen broadleaf forests (EBF), grasslands (GRA), and wetlands (WET).
