Ozone deposition in relation to canopy physiology in a mixed conifer forest in Denmark

In this study CO2 and H2O flux measurements made above a spruce forest was compared with the ozone flux to the canopy during growing seson 1995. The fluxes were determined by micro meteorological gradient methods using a 36-m tall meteorological mast. The trees were about 12 m high and air sampling was done from 36 and 18 m. The preliminary results suggest that there is only little correlation between ozone concentration in 36 m and the ozone flux to the forest, but the diurnal pattern of ozone uptake seems to be significantly influence by stomatal conductance. The cumulative total ozone uptake seems to follow very well the evapotranspiration.