Future atmospheric CO2 leads to delayed autumnal senescence

Gail Taylor, Matthew J. Tallis, Christian P. Giardina, Kevin E. Percy, Franco Miglietta, Pooja S. Gupta, Beniamino Gioli, Carlo Calfapietra, Birgit Gielen, Mark E. Kubiske, Giuseppe E. Scarascia-Mugnozza, Katre Kets, Stephen P. Long, David F. Karnosky

Research output: Contribution to journalArticlepeer-review


Growing seasons are getting longer, a phenomenon partially explained by increasing global temperatures. Recent reports suggest that a strong correlation exists between warming and advances in spring phenology but that a weaker correlation is evident between warming and autumnal events implying that other factors may be influencing the timing of autumnal phenology. Using freely rooted, field-grown Populus in two Free Air CO2 Enrichment Experiments (AspenFACE and PopFACE), we present evidence from two continents and over 2 years that increasing atmospheric CO2 acts directly to delay autumnal leaf coloration and leaf fall. In an atmosphere enriched in CO2 (by ∼45% of the current atmospheric concentration to 550 ppm) the end of season decline in canopy normalized difference vegetation index (NDVI) – a commonly used global index for vegetation greenness – was significantly delayed, indicating a greener autumnal canopy, relative to that in ambient CO2. This was supported by a significant delay in the decline of autumnal canopy leaf area index in elevated as compared with ambient CO2, and a significantly smaller decline in end of season leaf chlorophyll content. Leaf level photosynthetic activity and carbon uptake in elevated CO2 during the senescence period was also enhanced compared with ambient CO2. The findings reveal a direct effect of rising atmospheric CO2, independent of temperature in delaying autumnal senescence for Populus, an important deciduous forest tree with implications for forest productivity and adaptation to a future high CO2 world.
Original languageEnglish
Pages (from-to)264-275
JournalGlobal Change Biology
Issue number2
Early online date29 Oct 2007
Publication statusPublished - Feb 2008


  • autumnal phenology
  • elevated CO2
  • FACE
  • LAI
  • Populus
  • senescence


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