Response to Comment on "Increased growing-season productivity drives earlier autumn leaf senescence in temperate trees"

Abstract

Our study showed that increases in seasonal productivity drive earlier autumn senescence of temperate trees. Norby argues that this finding is contradicted by observations from free-air CO₂ enrichment (FACE) experiments, where elevated CO₂ has been found to delay senescence in some cases. We provide a detailed answer showing that the results from FACE studies are in agreement with our conclusions.