Environmental controls on ozone fluxes in a poplar plantation in Western Europe.
Tropospheric O3 is a strong oxidant that may affect vegetation and human health. Here we report on the O3 fluxes from a poplar plantation in Belgium during one year. Surprisingly, the winter and autumn O3 fluxes were of similar magnitude to ones observed during most of the peak vegetation development. Largest O3 uptakes were recorded at the beginning of the growing season in correspondence to a minimum stomatal uptake. Wind speed was the most important control and explained 44% of the variability in the nighttime O3 fluxes, suggesting that turbulent mixing and the mechanical destruction of O3 played a substantial role in the O3 fluxes. The stomatal O3 uptake accounted for a seasonal average of 59% of the total O3 uptake. Multiple regression and partial correlation analyses showed that net ecosystem exchange was not affected by the stomatal O3 uptake.
Department of Biology, Research Group of Plant and Vegetation Ecology, University of Antwerp, Wilrijk, Belgium; Department of Animal and Plant Sciences, University of Sheffield, Sheffield, UK. Electronic address: D.zona@sheffield.ac.uk.
D
D
Zona
B
B
Gioli
S
S
Fares
T
T
De Groote
K
K
Pilegaard
A
A
Ibrom
R
R
Ceulemans
D000383:Agriculture; D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D001530:Belgium; D017753:Ecosystem; D004784:Environmental Monitoring; D016468:Forestry; D006801:Humans; D010126:Ozone / Q000032:analysis*; D032107:Populus / Q000502:physiology*; D012621:Seasons; D014919:Wind
D000393:Air Pollutants; D010126:Ozone
AOT40; Deposition velocity; Eddy covariance; Stomatal O(3) uptake