Title
Future atmospheric <tex>$CO_{2}$</tex> leads to delayed autumnal senescenceFuture atmospheric <tex>$CO_{2}$</tex> leads to delayed autumnal senescence
Author
Faculty/Department
Faculty of Sciences. Biology
Research group
Plant and Vegetation Ecology (PLECO)
Publication type
article
Publication
Oxford,
Subject
Chemistry
Biology
Source (journal)
Global change biology. - Oxford
Volume/pages
14(2008):2, p. 264-275
ISSN
1354-1013
ISI
000253313400006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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 similar to 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.
E-info
https://repository.uantwerpen.be/docman/iruaauth/669300/3cf6164.pdf
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