J. D. Barnes, D. Eamus, A. W. Davison, H. Ro-poulsen, and L. Mortensen, Persistent effects of ozone on needle water loss and wettability in Norway spruce, Environmental Pollution, vol.63, pp.345-363, 1990.

T. Keller and R. Hasler, The influence of a fall fumigation with ozone on the stomatal behaviour of spruce and fir, Oecologia, vol.64, pp.284-286, 1984.

E. Paoletti, Ozone slows stomatal response to light variation and wounding in a Mediterranean evergreen broadleaf, Arbutus unedo, Environmental Pollution, vol.134, pp.439-484, 2005.

V. E. Wittig, E. A. Ainsworth, and S. P. Long, To what extent do current and projected increases in surface ozone affect photosynthesis and stomatal conductance of trees? A meta-analytic review of the last 3 decades of experiments, Plant, Cell and Environment, vol.30, pp.1150-1162, 2007.

, Changes in concentrations of N compounds in stream water were significantly related to changes in air, precipitation as well as deposition. In addition, contrary to these processes, increased concentrations of SO 4 2-in stream water highly correlated with decreased concentrations of SO 2 in the air and SO 4 2-deposition. It is highly probable that after remarkable decrease in SO 2 concentration in the air and sulphates deposition, forest ecosystems became cleaner due to leaching processes which took place in nature. As a proof of the possible processes in forest ecosystem, an adverse significant effect of SO 4 2-concentrations in stream water and defoliation of the considered tree species was detected. The increase in leaching of N compounds can most likely be related not only to the contamination of precipitation, but also to mineralization of the organic matter and nitrification processes which at LT01 in 1995 and 2002-2003. With intensification of mineralization and nitrification processes