|Title||Ozone exposure affects tree defoliation in a continental climate|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2017|
|Authors||De Marco, Alessandra, Vitale M., Popa I., Anav A., Badea O., Silaghi D., Leca S., Screpanti A., and Paoletti E.|
|Journal||Science of the Total Environment|
|Keywords||agricultural pest, air pollutant, Air Pollutants, Air pollution, Air pollution impact, article, atmospheric pollution, carbon sequestration, chlorophyll content, climate, Climate change, controlled study, Crown transparencies, Decision trees, defoliation, drug effect, forest ecosystem, forestry, Forests, leaf senescence, meteorological phenomena, Modeling, Nitrogen, nonhuman, Ozone, Ozone uptake, photosynthesis, physiology, plant leaf, Plant leaves, plant physiology, pollution effect, Regression analysis, Regression model, Romania, Toxicity, tree, tree crown, Trees|
Ground-level ozone (O3) affects trees through visible leaf injury, accelerating leaf senescence, declining foliar chlorophyll content, photosynthetic activity, growth, carbon sequestration, predisposing to pests attack and a variety of other physiological effects. Tree crown defoliation is one of the most important parameters that is representative of forest health and vitality. Effects of air pollution on forests have been investigated through manipulative experiments that are not representative of the real environmental conditions observed in the field. In this work we investigated the role of O3 concentration and other metrics (AOT40 and POD0) in affecting crown defoliation in temperate Romanian forests. The impacts of O3 were estimated in combination with nitrogen pollutants, climatic factors and orographic conditions, by applying a non-linear modelling approach (Random Forest and Generalised Regression Models). Ozone concentration and AOT40 under Romanian conditions were more important than meteorological parameters in affecting crown defoliation. In these particular conditions, POD0 never exceeded the critical level suggested by previous literature for forest protection, and thus was not important in affecting crown defoliation. © 2017 Elsevier B.V.
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