Abstract
Investigations using chlorophyll fluorescence induction kinetics provide the parameters R fd , L and A p to characterize different specifications of the photosynthetic system (PS). The application of ozone, with concentrations between 100 μg m −3 and 2000 μg m −3 to spruce in closed chambers yields a reduction of R fd between 6% and 23% for the current year's needles, which indicates a reduced potential photosynthetic capacity. Further measurements on the current year's needles of spruce of the damage classes SO/S1, S2 and S3 show also a reduction of R fd of between 7% and 14% in 2 successive years. In addition, the parameter L increases for damaged trees by between 11% and 49%, indicating a change of the chlorophyll content and of the internal energy distribution between PSI and PSII. As no effect of L can be observed with ozone fumigation, it is concluded that the change of some specifications of the PS can be simulated well by ozone fumigation (e.g. R fd ) while other specifications cannot (e.g. L).
Published Version
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