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Diefendorf et al. (1) and I (2) compiled plant isotopic datasets to further explore long-recognized dependencies of C3 δ13C on aridity (3) and plant functional type (4). We used different approaches, and Freeman et al. (5) raise several questions regarding scientific rationale and methods, including (i) regressions and arid site data, (ii) data averaging, and (iii) applications. i) I viewed Earth's low mean annual precipitation (MAP) environments as key for groundtruthing models. Regardless, excluding low MAP (<90 mm/y) data changes my model predictions negligibly (<0.1‰ or <20 mm MAP) and implies compositions of −24.3‰ for the driest sites (<50 mm/y), indistinguishable from observations (−24.1 ± 0.6‰). Thus, data from arid sites do …

Reply to Freeman et al.: Carbon isotope discrimination by C3 plants