Yliopiston etusivulle Suomeksi På svenska In English Helsingin yliopisto


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dc.contributor Helsingin yliopisto, Department of Forest Sciences fi
dc.contributor.author Tupek, Boris
dc.date.accessioned 2012-06-04T08:44:50Z
dc.date.available 2012-06-04T08:44:50Z
dc.date.issued 2009
dc.identifier.citation Tupek , B 2009 , ZHODNOTENIE VPLYVU TROPOSFÉRICKÉHO OZÓNU NA VYBRANÉ LESNÉ EKOSYSTÉMY SR , Technical University Zvolen . en
dc.identifier.other PURE: 21133243
dc.identifier.uri http://hdl.handle.net/10138/33925
dc.description.abstract Tropospheric ozone (O3) degrades plant tissues. Degradation is caused by the unbalance between the O3 uptake from the atmosphere and the subsequent O3 detoxication in the leaf mesophyl. The ozone uptake (UO3) is controlled by the opening closing of the stomata, stomatal conductance for O3. The study sites forms the elevation transect in Slovakian High Tatra Mountains (Stará Lesná, Tatranská Lomnica, Štart, Deviatka, Skalnaté pleso, Lomnický Štít). In the stations we were continuously measuring daily ambient O3 concentrations, simultaneusly with the meteorological weather characteristics (air temperature and moisture, global radiation) during the period of 20012003. Beside the weather records, we kept the track on the synoptic movements and the pressure formations of the air-masses over the Europe. The O3 stress index AOT40 surpassed 2 to 5 times the level for the protections of the forest stands 10 ppm/h. Based on the principles of stomatal conductance for O3 we calculated the values of UO3 for the coniferous stands of the tatra transect. The values of cumulated UO3 did not reach the level of 10 mmol/m2 , what means by the study of Wieser (1997) for the similar conditions that the reduction of the net photosynthesis did not reach 5%. We used the calculated values of UO3 (based on the principle of the ambient air O3 concentrations and stomatal conductance for O3) to develop a nonlinear regression model between UO3 and the air temperature. The ozone uptake model based on the air temperature explained on the average 74% of the variation. The optimal temperature of around 15 to 17 degree Celsius showed the maximum ozone uptake 0.031 0.046 ug/m2/s, while 60% of maximum UO3 was found in the 10 degrees deviation from the optimum temperature. The parameters of the nonlinear regression between the ozone uptake and the temperature were fitted for each synoptic type (ST). Maximum UO3 for the cyclonic situations were higher and reached during higher optimal temperature, while typically warmer anticyclonic situations showed lower maximum UO3 during the lower optimal temperature. The average maximum UO3 level of all synoptic types was 1500 ug/m2/d reached at the 18.6 degree Celsius. According to the ozone uptake models were the maximum values of UO3 for cyclonic situations on the average 1700 ug/m2/d reached at the 19.0 degree Celsius. Whereas, typically warmer anticyclonic situations reached on the average about 500 ug/m2/d lower maximum UO3 at the lower optimal temperature 18.0 degree Celsius. The model residuals from the modeled and calculated UO3 for daily synoptic types did not show a clear trend. Differences among the model residuals were by far pronounced during the analysis with 4days sequences of the same weather pattern. The most frequent 4days sequence during the summer season Wa (West anticyclone) deviated plus 100 to1000 ug/m2/d of UO3 from the modeled value. In contrary to Wa, the 4days sequences A and Sa mainly lowered UO3 values by 500 to 700 ug/m2/d from the modeled value. Ozone induced damage on the plant is not the result of the high ambient O3 concentration itself. The damage comes, if the balance between the ozone uptake and the O3 detoxification inside leaf mesophyl is shifted towards the ozone uptake. The study focused on the ozone uptake means considering the physiological O3 stress from the accumulation point of view, advanced to the ambient O3 concentration itself. On the other hand, measuring biochemical processes of depleting detoxicants, ascorbate pool, and remaining O3 concentrations degrading plant tissues would improve the quality of the future O3 stress studies. en
dc.language.iso ces
dc.title.alternative Tropospheric ozone uptake into forests of Slovakian High Tatra mountains en
dc.type G4 Doctoral Thesis, monography
dc.type.dcmitype textfile
dc.type.uri info:eu-repo/semantics/doctoralThesis

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