Modeling of the impact of the air temperature increments on the stomatal conductance and ozone doses in the mountain area of High Tatra Mts., Slovakia

Tropospheric ozone is a reactive compound originating from both biogenic and anthropogenic emissions and stratospheric intrusions. Open-top chamber studies and fumigation experiments have already proven an adverse effect of its elevated concentrations on vegetation including changes in microscopical structures, leaf bronzing, and most important the decrease in growth increment. Ozone distribution in the troposphere is irregular in both time and space and its daily and annual course is affected by several factors (such as solar radiation and precursor concentrations). Ozone concentrations increase with altitude, which might lead to the assumption, that the mountain flora is more endangered by ozone effects than the flora at the lower altitude. The studies focusing on ozone effects on vegetation are oriented predominantly on the crop and timber production species and the research in the natural environment beyond this production is marginal. One of the ways to estimate ozone impact on vegetation is ozone dose calculation POD_Y. The determining factor of ozone dose modeling is stomatal conductance (g_sto, mmol m^-2s^-1), which describes the degree of stomata opening and therefore regulates the ozone uptake by the stomata. This variable is weather- and environment-dependent. The stomatal conductance was estimated by the stochastic model and Jarvis model, which is recommended by United Nations Economic Commission for Europe. The expected air temperature increase might influence the ozone doses mostly by the change in stomatal conductance and by the prolongated growth season of plants. The poster will provide the basic evaluation of air temperature increments on ozone doses for forest species in High Tatra Mts. for future projections.