Modelling the Uptake of SO2 into Leaves of Forest Canopies — Dynamic and steady state considerations
Using a network for diffusion and reaction of SO2 uptake via the stomates and metabolization in various compartments of the leaves of coniferous and deciduous forest canopies is taken into consideration. On the basis of the uptake rates computed for leaves we predict within the validity of our dynamic model a mean annual uptake of 0.35 g S•m-2•yr-1 for beech canopies and a corresponding uptake of 0.79 g S•m-2•yr-1 for spruce canopies. Taking into consideration the most important tree species growing in the FRG we compute a weighted mean average of 0.55 g S•m-2•yr-1 for stomatal uptake. On the basis that the dry deposition of S within the FRG amounts to 0.8•106 t•yr-1, corresponding to an average of 3.2 g S•m-2•yr-1 it can be concluded from our calculations that between 6 and 16% of the total dry deposition can be ascribed to stomatal uptake. We can show explicitely for a reduced leaf/canopy model that SO2 uptake is controlled by the relative proportions of diffusive transport and biochemical reactions within the leaf.
KeywordsStomatal Resistance Elimination Reaction Annual Uptake Uptake Velocity Hydrogen Sulfite
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