Extended Data Fig. 3: Comparison of long-term climatological aridity and ecosystem-scale traits between SM- and VPD-dominated pixels across energy-limited regions.
From: When and where soil dryness matters to ecosystem photosynthesis
Comparison of wetness index (a), apparent rooting depth (Zr, b), xylem water potential measured at 50% xylem conductivity loss (Ψ50, c), degrees of anisohydricity (d), and canopy height (e) between SM- and VPD-dominated pixels across energy-limited regions. Only the PFTs with a sample size greater than 50 for both SM- and VPD-dominated pixels are shown. The central lines of box plots indicate the median values, the upper and lower box limits represent the 75% and 25% percentiles, and the upper and lower whiskers extend to 1.5 times the interquartile range, respectively. The comparison is done by Welch’s two-tailed t-tests, with adjusted p-values (Bonferroni correction) indicating different significant levels: P < 0.05 (*), P < 0.01 (**), P < 0.001 (***), and P < 0.0001 (****). The numbers in parentheses (e) represent the sample size for each PFT in a-e.
