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 season 1995. The fluxes were determined by micro meteorological gradient meth ods using a 36-m tall meteorological mast. The trees were about 12 m h igh and air sampling was done from 36 and 18 m. The preliminary result s suggest that there is only little correlation between ozone concentr ation in 36 m and the ozone flux to the forest, but the diurnal patter n of ozone uptake seems to be significantly influenced by stomatal con ductance. The cumulative total ozone uptake seems to follow very well the evapotranspiration. (C) 1998 Elsevier Science Ltd.