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ŠUMARSKI LIST 7-8/2020 str. 29     <-- 29 -->        PDF

reported as very dry in most of Europe, with adverse impacts on vegetation (Gobron et al., 2005). These results correspond to the more general observations of drought in Croatia in 2000 and 2003 (Cindrić et al., 2010, Mihajlović, 2006)
The results of defoliation assessments seem to show a one –year lag effect, with defoliation rising in the year following a drought year. These results are consistent with previously reported findings (Graf Pannatier et al., 2007). Despite a wide range of ecological conditions present on ICP Forests Level I beech monitoring plots all over Europe, a similar rise in mean plot defoliation above the trend line was recorded in 2001 and 2004 (Timmermann et al., 2017). However, not every rise in defoliation of a tree should be equalled with the permanent decrease of vitality. Crown defoliation is obviously a product of tree crown status from the past several years of growth, which can be misleading if used as a stress indicator when assessing current vitality