Abstract
Abstract Stand level O 3 fluxes were calculated using water balance calculations for 21 Common beech ( Fagus sylvatica L.) stands and O 3 data from 20 monitoring stations in Southern Germany. For this intention, the daily loss of water by evapotranspiration per stand area was set against the daily O 3 uptake. During the last 30 years, O 3 uptake ranges between 0 and 187 mmol ha −1 d −1 per stand area. Cumulative O 3 uptake (CUO 3), ranging between 0.1 and 0.7 mmol m −2 yr −1 per stand area, shows increasing trends since 1971 with considerably greater values at high altitudes. Effects in radial growth were used to derive an initial approximate critical threshold value for O 3 impacts on the vitality and growth of mature beech stands in Southern Germany. It is concluded that this concept of O 3 flux estimation in combination with dendroecological analyses offers both a site specific and regional applicable approach to derive new critical levels for O 3.
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