Comment on “Increased growing-season productivity drives earlier autumn leaf senescence in temperate trees”
Richard J. Norby
Abstract
Zani et al . (Research Articles, 27 November 2020, p. 1066) propose that enhancement of deciduous tree photosynthesis in a CO 2 -enriched atmosphere will advance autumn leaf senescence. This premise is not supported by consistent observations from free-air CO 2 enrichment (FACE) experiments. In most FACE experiments, leaf senescence or abscission was not altered or was delayed in trees exposed to elevated CO 2 .
Topics & Concepts
SenescenceAbscissionTemperate climateDeciduousBiologyPhotosynthesisTemperate deciduous forestProductivityBotanyAtmosphere (unit)Growing seasonHorticultureGeographyMeteorologyCell biologyMacroeconomicsEconomicsPlant responses to elevated CO2Plant Water Relations and Carbon DynamicsAtmospheric chemistry and aerosols