The seasonal variability of air pollution effects on pine conditions under changing climates |
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| Authors: | Algirdas Augustaitis Ingrida Augustaitien? Almantas Kliu?ius Gintaras Pivoras Dalia ?opauskien? Rasel? Girg?dien? |
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| Institution: | (1) Lituanian University of Agriculture, 53362 Kaunas dstr, Lithuania;(2) Institute of Physics, Savanoriu 231, 02300 Vilnius, Lithuania |
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| Abstract: | The multiple-stressor effects of air pollution, nutrient and water availability are the key issues of present forest ecosystem
research. However, too little is known about the seasonal effect of pollutants on tree crown defoliation and their interaction
with changes in climate. Therefore, data on seasonal variation in air pollution, including surface ozone, deposition of acidifying
compounds and meteorological conditions, were tested against pine defoliation to identify the periods when the effect of the
considered contaminants is most pronounced. The findings of the study revealed that a higher level of air concentrations of
acidifying pollutants and their deposition was observed during the dormant period, with the exception of only ΣNH4+ air concentrations and their monthly deposition. An increase in precipitation over the vegetation period and mean monthly
temperature from September to December, as well as a decrease in temperature and precipitation over the remaining months of
the dormant period represented the climate change condition over the 14-year period in the observed region. Detected changes
in the considered parameters during the dormant period were found to be most significant to changes in pine crown defoliation.
Therefore, we concluded that climate changes, if they occur by the detected scenarios, should mitigate the negative effect
of air pollutants and acid deposition on pine crown condition. |
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